Answer:
CELL THEORY WAS PROPOSED BY SCHIELDEN AND SCHAWWAN
ITS MAIN POSTULATES ARE
All organisms are composed of one or more cellsCells are the smallest living things,the basic unit of organization of all organismsCells arise only by divisons in previously existing cells.Explanation:
i hope this will help you :)
Answer:
Cell theory was proposed by schleiden and schwann
All organisms are composed of one or more cells
Cells are the smallest living things
The diagram shows the position of earth during solstice. select the area that would be getting around 24 hours of daylight each day.
The answer is Artic Circle Zone (red square at the top)
Explanation:
A solstice occurs two times in a year when the Sun reaches farther either the south or the north of Earth. In the image presented, there is a solstice because the sunlight reachers farther in the North. Additionally, this phenomenon occurs due to the tilt (inclination) of Earth, and it increases the number of daylight/night hours in different zones.
In the case of the Arctic Circle Zone (north pole) it is likely during the solstice, this zone has around 24 of daylight each day because almost all this zone is directly exposed to the sunlight, and therefore this will always be reached by sunrays despite the rotation of Earth (rotation of Earth in its axis). On the other hand, other zones will not be exposed to sunlight all the time because the location and rotation will cause these areas are in the dark zone of Earth during specific hours every day.
Answer: The top red square near the axis.
Explanation:
Ok, the Earth's axis is the "line" around which the Earth rotates.
This means that after a rotation, the 3 bottom red boxes will be in the dark side of the diagram ( for example, if you have a ball and you grab it with the logo facing you, when you rotate the ball, the logo will be in the other side, and you will not be able to see the logo).
Now, as the area near the axis actually does not move that much, the red square near the axis (the top red square) will be most likely getting 24 hours of light each day.
Which of the following sentences correctly uses a pronoun to create emphasis?
O He, Jacob Smith, studied for 10 hours.
O He himself wrote the 20-page paper.
O He and they trained for the marathon.
O Himself worked for weeks on the project.
The correct answer is B. He himself wrote the 20-page paper.
Explanation:
Pronouns such as himself, yourself, themselves, or myself, which are known as intensive pronouns, are used to emphasize the subject of a sentence, usually by placing the pronoun right the subject or main pronoun. This can be seen in the sentence "He himself wrote the 20-page paper" because the pronoun "himself" emphasizes the action "wrote" performed by "he", which is the main subject of the sentence. According to this, it is in the second sentence a pronoun creates emphasis.
Write down the oxygen requirements of the microorganisms growing in thioglycolate tube.
Answer:
Obligate aerobic microbes requires oxygen for its survival in the thioglycolate tube while Obligate anaerobic microbes does not requires oxygen.
Explanation:
Thioglycolate tube is a tube which is used to determine the oxygen requirement of different types of microbes. The concentration of oxygen is higher in the upper portion of the tube while in the lower portion, the concentration of oxygen is the lowest. So those microbes who needs oxygen for their survival will be present in the upper portion of the tube while those microbes who does not need oxygen, will be present at the bottom of the tube.
how many polynucleotide chains does a DNA molecule have
two
A DNA molecule consists of two long polynucleotide chains composed of four types of nucleotide subunits.
"a man with genotype bb and a woman wth genotype BB have four children. how many of the children are likely to have blue eyes"
Answer:
No children will have blue eyes all of them carry brown eyes only.
Explanation:
The cross between a male with bb genotype and female with BB genotype will be as follows :
The gametes will be formed
male: b and b
female: B and B
By Punnett square:
B B
b Bb Bb
b Bb Bb
As all the offspring will have a heterozygous condition with dominant B (Brown) and recessive b( blue) so there are no offspring will be with the phenotype of the blue eyes.
Which statement below can NOT be used
when describing volume?
A. Volume is the amount of space that an object occupies.
B. The volume of an object is the same as the weight of that
object.
C. Volume can be measured in cubic centimeters.
D. Volume is calculated using a formula: V = 1xwxh.
In the large intestine material is stored how many
hours prior to elimination?
Explanation:
After you eat, it takes about six to eight hours for food to pass through your stomach and small intestine. Food then enters your large intestine (colon) for further digestion, absorption of water and, finally, elimination of undigested food. It takes about 36 hours for food to move through the entire colon.
PLEASE HELP!! Gas cloud 1 is likely to form a star. Gas cloud 2 is not. Based on this information, match the given conditions with each cloud. *options and pictures attached*
Answer:
Gas cloud 1: It spreads with a greater volume and less concentration of elements. Its temperature stays well below the 14 million Kelvin. It has hydrogen atoms that retain there electrons.
Gas cloud 2: Its volume shrinks and the density increase die to the gravity . Its temperature stays above the 14 million kelvin . Hydrogen atoms shed there electron.
Explanation:
As you already know, stars form within clouds of gas. These clouds have interstellar gases composed mainly of dust and hydrogen. When subjected to low temperatures, gases react and combine to form molecules that create clouds and continue to react until they form stars.
Cloud 1 has characteristics that show that it will form a star which are: It spreads with a greater volume and less concentration of elements, its temperature stays well below the 14 million Kelvin, it has hydrogen atoms that retain there electrons.
as we know that cloud 2 will not form stars we can say that its characteristics are: Its volume shrinks and the density increase die to the gravity , its temperature stays above the 14 million kelvin , hydrogen atoms shed there electron.
Answer: Gas cloud 1: Its volume shrinks and the density increase die to the gravity. Its temperature stays well below the 14 million Kelvin. It has hydrogen atoms that retain there electrons.
Gas cloud 2: It spreads with a greater volume and less concentration of elements. Its temperature stays above the 14 million kelvin . Hydrogen atoms shed there electron.
Explanation: I just took the test and these are the right answers
A tumor cell with a mutation in Rb can divide in the absence of extracellular signals. A. If the Rb mutation is responsible for the increased cell division, is it likely that Rb is always active or always inactive
Answer:
The Rb will always stay active
Explanation:
The Rb, undergoing a mutation that promotes cell proliferation, the cells will proliferate excessively, either benignly or malignant, forming a tumor structure.
The Rb mutation is considered an irreversible process, which will generate an unlimited and excessive growth that is abnormal when compared to the other non-mutated cells.
What are ways that humans can lower bio diversity as they use the environment
Answer:
1. Reduce the misuse of land.
2. Reduce climate change.
3. Reduce invasive species.
Limited clinical trials are an example of translational research.
True
False
Give 8 Differences each between immunization and immunity
Anyone that answers I will mark the person as brilliant
Answer:
1- The immune system develops antibodies to the disease so that it cannot make you sick again.
2- Immunization describes the actual changes your body goes through after receiving a vaccine.
3- Immunization is the process whereby a person is made immune or resistant to an infectious disease.
4- Vaccines stimulate the body’s own immune system to protect the person against subsequent disease.
5- Immunity is the capability of multicellular organisms to resist harmful microorganisms from entering their cells.
6- Immunity is the ability of an organism to resist a particular infection or toxin by the action of specific antibodies or sensitized white blood cells.
7- Immunization is the action of making a person or animal immune to infection.
8- Vaccines strengthen the immune system.
what might be reasons why galileo galilei failed to discorve a cell yet wsd the one who invented a microscope
Answer:
Galileo galilei was an astronomer not a biologist.
Explanation:
Galileo galilei failed to discover a cell yet the one who invented a microscope because the Galileo galilei was an Italian scientist who contributes in the field astronomy and mathematics. He was not interested in biology so he was not able to discover the cell in the presence of microscope. Galileo galilei made many theories about the universe and make improvements in the structure of telescope which enables him to study the universe.
Who first identified nucleic acids, and where were they discovered?
A Friedrich Meischer discovered nucleic acids in blood cells.
B Phoebus Levine discovered nucleic acids in plant cells.
C James Watson and Francis Crick discovered nucleic acids in DNA.
D Gerardus Johannes Mulder discovered nucleic acids in bacterial cells.
Answer:
A
Explanation:
He discovered them in 1868. I hope this helps:)
Friedrich Meischer, a Swiss physician and biologist, is credited with the discovery of nucleic acids. The correct option is A.
What is Nucleic acid?
Nucleic acids are complex macromolecules that play a fundamental role in storing, transmitting, and expressing genetic information in living organisms. They are essential for the inheritance of traits and the functioning of cells. There are two main types of nucleic acids: deoxyribonucleic acid (DNA) and ribonucleic acid (RNA).In the late 1860s, Meischer was conducting experiments on white blood cells (leukocytes) and noticed that these cells contained a substance that was different from proteins.
He isolated this substance, which he called "nuclein," from the nuclei of white blood cells.
Meischer's discovery laid the foundation for our understanding of nucleic acids.
Thus, the correct option is A.
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Vesicles:
-are transport compartments that can move particles into or out of a cell
-are surrounded by plasma membranes
-O are created by and are part of the endomembrane system or are created at the cellular membrane
-all of these
-O none of these
23
Answer:
all of these
Explanation:
Certain molecules like proteins and lipids are synthesized by organnelles in a cell. These molecules are transported by small membrane enclosed sacs in a cell called VESICLES.
Vesicles are small enclosures surrounded by a membrane made of lipid bilayer. This membrane separates them from the cytoplasm of the cell. They function as transport compartments that move particles in and out of the cell.
Vesicles are produced by some organnelles that make-up the Endomembrane system like Endoplasmic Reticulum, Golgi apparatus etc. while other vesicles are created as a result of endocytosis by the cell membrane. Vesicles can serve as secretory vesicles or transport vesicles etc.
write the name of 5 plants that reproduce by stem?
Answer:They are
Ginger
Potato
Basil
Rosemary
Lavender
Explanation:Feel pleasure to help u...
Answer:
Onions , ginger, gladiolus, common ivy, dahlia
Explanation:
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Match the correct secretion with its organ of origin and/or its function.
a. This secretion is produced by the liver and stored in the gallbladder.
b. Secreted by the pancreas, this enzyme acts to digest proteins
c. This secretion acts to emulsity fats
d. This enzyme is secreted by the pancreas and acts to digest lipids.
e. This enzyme is secreted by the pancreas and acts to digest carbohydrates.
1. Bile
2. Pancreatic Lipase
3. Pancreatic Amylase
4. Bicarbonate
5. Proteases
Answer:
A,C- bile.
The bile salts participates in the processes of fat digestions,it emulsify fats to micelle.It coats this so that lipase enzyme action on it will be faster.
D-Pancreatic Lipase.This is the enzyme that catalysis the hydrolysis of lipds.it catalysis this to fatty acids and glycerol, for easy absorption in the lacteal.
E- Pancreatic Amylase- this is the enzyme present in saliva. It catalysis the hydrolysis of starch to maltose.This is the first step in the starch digestion.
B-Proteases. This catalysis the breakdown of protein(proteolysis) to amino acids.This occur by acting on the peptide bonds among the amino acids units in protein molecules.This ensure the hydrolysis of protein into smaller units amino acids.
Explanation:
A population of fish exhibits multiple variations in color, size and mouth structure; however, there does not appear to be any selective advantage for these traits because all individuals are allowed to breed and survive! Which of the following is most likely occurring in this fish population?
Answer:
This population of fish is undergoing the process of Genetic diversity
Explanation:
The phenomenon known as Genetic diversity is described as variation that occurs within a species or community. Individual organisms are unique owing to their genetic makeup. Ample variation within a population, or genetically diverse population, allows it to better survive various sorts of stresses from the environment, ensuring better survival of the species.
write two functions of Endoplasmic and reticulum
Answer:
there are two types of endoplasmic reticulum, rough endoplasmic reticulum and smooth endoplasmic reticulum, the rough endoplasmic reticulum is the site of protein manufacture( because it has ribosomes) whereas the smooth endoplasmic reticulum manufactures fat molecules or lipids. these lipids helps in membrane biogenesis, which is the process of formation of plasma membrane. the main function of the endoplasmic reticulum is that it serves as channel for transportation of proteins etc between various cells or a cell organelle and another cell. In the liver, detoxification of poisons take place due to the help of smooth endoplasmic reticulum.
Answer:
Functions of Endoplasmic reticulum;
It forms cell circulatory system and helps in transportation of materials inside the cytoplasm.It acts as cytoskeleton and gives mechanical support.It helps in compartmentalization of cytoplasm for synthetic activity.These cell organelles form primary lysosomes.Hope this helps...
Good luck on your assignment..
What structure is found mostly in green plant cells but not in animals
Answer:
The answer is Chloroplast.
Explanation:
Chloroplast is a structure in green plant cells which contain a substance called chlorophyll which give plant leaves their green color.
Hope this helps you
What are some questions that biologists might ask about the living things they study?
Molecular biology is asked about the living things they study
a smoker develops damage to several alveoli that can no longer function. how does this affect gas exchange?
Answer:
Smoking causes the hardening of the alveoli walls. This keeps them from extending or stretching out because of the loss of elasticity. In such a circumstance, it is hard to take up oxygen from the inspired air or to remove carbon dioxide from the circulation system. This would prompt partial or less trapping of the gases in the lungs.
With this damage due to smoking, the alveoli can not assist the bronchial tubes enough. The tubes also get damaged and cause a blockage or obstruction, which traps air inside the lungs. An excess of air caught in the lungs can give a few patients a barrel-chested appearance.
Chorionic villi are more prolific Select one: a. Adjacent to the yolk sac b. Opposite the cervical os c. Near the implantation site d. Adjacent to the uterine fund us
Answer:
Adjacent to the yolk sac
Explanation:
Chorionic villi are microscopic and fingerlike projections found near the placenta which contain capillaries, increase surface area of blood that allow blood to flow and transfer nutrients from the mother to the fetus. The chorionic villi is adjacent to the yolk sac because it developed from the yolk sac, villi can extend and contact maternal blood vessels thereby nourishing the embryo and transfering nutrients from the mother to the fetus.
Darwin observed that finches’ _______ were specialized according to their unique environments.
Answer:
Beaks
Explanation:
Penn Foster
hope this answer is correct
Answer:
1. beaks
2. uniformitarianism
3. competition
4. Hutton was the first scientist to propose that the earth is several million years older than originally believed.
5. Nature is really good at establishing measures of population control when the demand for resources outstrips the supply. Disease and starvation increase to help reduce or limit the population.
6. Darwin applied the concept of uniformitarianism to biology and natural selection through a focus on constant small changes.
7. This suggests that round-winged flies are more fit in their local environment.
8. The geological processes responsible for changes in the earth several million years ago are similar to the geological processes changing the earth now, often in ways not immediately apparent. This is known as uniformitarianism.
Explanation:
pen
Which form of bacteria is matched correctly to its description? spirillum—has a rod shape and exists in chains or alone coccus—can cause MRSA and has a round shape coccus—can cause acne and has a spiral shape bacillus—has a spherical shape and can form clusters
Answer:
coccus—can cause MRSA and has a round shape
The form of bacteria is matched correctly to its description is coccus, which can cause MRSA and has a round shape.
What are the forms of bacteria?Bacteria is a microscopic living organism that can exist as free-living or in colonies.
Based on shape, bacteria can exist in the following forms:
spherical shaped (cocci)rod shaped (bacilli)spiral shaped (spirilla)comma shaped (vibrios) corkscrew (spirochaetes)Therefore, the form of bacteria is matched correctly to its description is coccus, which can cause MRSA and has a round shape.
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ASAP You are observing proteins in a lab for an experiment. During transport, they have started to unwind and lose their shape. You notice long strands wound into alpha helices. What level of structure are the proteins in? A. Quaternary B. Primary C. Secondary D. Tertiary
Answer:
C. Secondary
Explanation:
In proteins, the structure of local segments can be arranged into three different three-dimensional formations: alpha helices (α-helix), beta sheets (β-strand) and omega loops. An alpha helix is the most common secondary protein conformation because it has low-energy and a stable arrangement. The α-helix is formed by the interaction between amino acids of every backbone N−H hydrogen bonded with the backbone C=O group of the corresponding amino acid residue in the polypeptide chain. The α-helix motif is very common in transmembrane segments of proteins that cross the lipid bilayer.
Translation in bacterial and eukaryotic cells has many similarities, but there are also several key differences. Which of the following is one of those differences that is seen in eukaryotes?
a. Translation and transcription are coupled.
b. Eukaryotic ribosomes are smaller with fewer proteins and RNA molecules.
c. Eukaryotes use the 5′ G-cap and Poly-A-tail on their mRNAs to initiate translation.
d. Eukartyotic mRNA contains a Shine—Dalgarno sequence that increases the efficiency of translation.
Answer:
The correct answer is B and C
sorry if incorrect
The statement 'eukaryotes use the 5′ G-cap and Poly-A-tail on their mRNAs to initiate translation' correctly describes one difference observed in eukaryotic and prokaryotic cells (Option c).
In eukaryotes, the 5′ G-cap on the 5′ end of a messenger RNA (mRNA) molecule is a Guanine nucleotide linked to mRNA trough 5′-5′ triphosphate linkage.The poly Adenine tail (poly-A-tail) is a long sequence composed of repeated Adenine nucleotides in the 3' end of the mRNA.Both 5′ cap and the poly-A-tail act to protect the mRNA transcript from exonuclease (enzymatic) degradation and initiate translation.In conclusion, the statement 'eukaryotes use the 5′ G-cap and Poly-A-tail on their mRNAs to initiate translation' correctly describes one difference observed in eukaryotic and prokaryotic cells (Option c).
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The enzymes cannot metabolize the fat and the fat soluble vitamins are not absorbed to any great degree. You are now waiting on the taste test results. You are, however, a little fearful that this "fat" will not become the diet option you are hoping for because:___________
Answer:
fat is not being obsorved in body on any great degree
because the inability to metabolize fats and the poor absorption of fat-soluble vitamins indicate potential issues with the digestion and absorption of dietary fats. If the taste test results reveal that the "fat" in question is not palatable or does not meet the desired flavor profile, it could be a significant obstacle in promoting it as a favorable diet option.
This indicates that the body is encountering challenges in breaking down and utilizing dietary fats. Fat metabolism is a complex process involving enzymes that break down fats into smaller components, such as fatty acids and glycerol, which can be utilized for energy production or stored in adipose tissue. If the enzymes responsible for fat metabolism are not functioning properly, it can lead to difficulties in properly utilizing fats from the diet.
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What happens to the products of the Krebs cycle?
Answer:
pyruvate is broken down in a series of reactions to form CO2
Explanation:
Arrange the structures in the following list in the order that blood will encounter as it flows from the heart back to the heart in the cardiovascular circuit.
1. venules
2. arterioles
3. capillaries
4. elastic arteries
5. medium veins
6. large veins
7. muscular arteries
Answer:
The correct order is - 4.elastic arteries, 7.muscular arteries, 2. arterioles, 3. capillaries, 1. venules, 5. medium veins, 6.large veins
Explanation:
The cardiovascular circuit Or the pathway is the sequence of structures that takes oxygenated blood from the heart and deliver it to various parts of the body and than beings the deoxygenated blood back to the heart.
This cardiovascular circuits involves various types veins, Capillaries and arteries and heart. The correct order of the structures of order that blood will encounter as it flows from the heart back to the heart is -
4.elastic arteries, 7.muscular arteries, 2. arterioles, 3. capillaries, 1. venules, 5. medium veins, 6.large veins