Answer:
the current carbon dioxide level in the atmosphere is 400ppm
The principal enzyme involved in DNA replication is called _____________. The enzyme joins ________________ to synthesize a new _______________ strand of DNA. DNA replication is called ______________ because each new DNA molecule is made up of one original and one new strand.
complementary
DNA polymerase
nucleotides
semiconservative
Answer:
The principal enzyme involved in DNA replication is called _DNA polymerase_. The enzyme joins _nucleotides_ to synthesize a new __complementary_ strand of DNA. DNA replication is called __semiconservative__ because each new DNA molecule is made up of one original and one new strand.
Explanation:
DNA replication is the process through which DNI molecule duplicates. This event takes place during the S stage of the interphase. So when the cell divides during mitosis or meiosis, each cell will get a complete set of chromosomes.
DNI replication is semi-conservative because each new molecule carries an original DNI strand and a new one. The fact that the new molecule is composed of an original strand makes it semi-conservative. The old existing strands are used to synthesize the new complementary strand.
The origin of the replication requires helicase enzymes to break hydrogen bonds and separate the two original strands. The topoisomerase enzyme is necessary to release tension. Other proteins are also needed to join the strains and keep them separated. Once the molecule is opened, there is a region named replication forks. DNA polymerase makes the new nucleotides enter into the fork and pairs them with the corresponding nucleotide of the original strand. Adenine pairs timine, and cytosine pairs guanine.
DNA strands are antiparallel, and replication occurs only in 5´-3´direction. So one of the strands will replicate continuously, while the other strain will be formed by short fragments known as Okazaki fragments.
Primers are needed to make the DNA polymerase work. Primers are small units of RNA and are placed at the beginning of each new fragment.
what are the names of the three domains
A.bacteria,archaea,eukaryotic
B.bacteria,archaea,animalia
C.archaea,plantista,animalia
D. Life,animals,plants
Answer:
A. bacteria, archaea, and eukaryotic.
Explanation:
Bacteria, archaea, and eukaryotic are the three domains of life.
The three domains system was globally implied. The three domains were Archae, Bacteria and Eukarya. The correct answer is option A.
The three domains of Carl Woese's categorization system are archaea, bacteria, and eukaryotes. The six kingdoms are archaebacteria (ancient bacteria), eubacteria (actual bacteria), protozoa, fungi, plants, and animals.
This classification system divides life into several groups based on differences in the 16S ribosomal RNA (rRNA) structure, the lipid composition of the cell membrane, and antibiotic sensitivity. The main distinction from earlier classification schemes is the division of Kingdom Monera into Archaea and Bacteria.
Therefore, the names of three domains given by Carl Woese were Archae, Bacteria and Eukarya i.e. option A.
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in VDJ recombination occurs in the Group of answer choices variable region of the heavy chain. constant region of the light chain. variable region of the light chain. Both the light and heavy chain.
Answer:
constant region of the light chain.
Explanation:
The VDJ recombination is defined as the process where the T cells as well as the B cells are randomly assembled from the different gene segments. These are mainly known as the variables (V), the diversity (D) and the gene (G). This is done in order to generate the unique receptors which is also called as the antigen receptors so that they can collectively recognize the different types of the molecules. It mainly occurs in the constant region of the light chain.
Explain Newton’s First Law and give an example of it
Answer:
When a person jumps out of a moving vehicle, he falls forward due to inertia of motion. One example of Newton's first law in real life is, when you are walking with a glass filled with water, you will notice that the water spills at certain locations when you walk at faster pace. The water inside the glass will remain at rest until you move.
Explanation:
Answer:Newton's first law states that, if a body is at rest or moving at a constant speed in a straight line, it will remain at rest or keep moving in a straight line at constant speed unless it is acted upon by a force.
An object at rest stays at rest.
Explanation:
Fill in the blank with the appropriate term.
1. Cartilage is a type of dense ___________________ tissue.
2. The skeleton provides attachment surfaces for __________________.
3. The skeleton maintains ________________ homeostasis.
4. When mineral levels in the blood are too high, bones absorb some of the minerals
and store them as mineral ___________________.
5. Bone matrix is crisscrossed by blood vessels and ___________________.
6. Osteoclasts dissolve minerals in bone ___________________.
7. Bone marrow is found inside the pores of ________________ bone.
8. Early in the development of a human fetus, the skeleton is made entirely of
______________________.
9. By birth, several areas of cartilage remain in the skeleton, including the ends of the
___________________ bones.
10. With the help of muscles, joints work like mechanical ___________________.
11. The surfaces of bones at joints are covered with a smooth layer of cartilage that
reduces ___________________ at the points of contact between the bones.
12. Immovable joints allow no movement because the bones at these joints are held
securely together by dense ___________________.
PLZ help me I’m too slow
Help ASAP do plz!!!!!
Answer:
C.) repeating the experiment
Explanation:
By repeating the same exact experiment, you will see if the first one was maybe a fluke or it was "real".
When an evolutionary biologist designs an experiment to test a hypothesis, which term is used to describe the variable that the scientist changes among his/her groups of study organisms.
Explanation:
Controlled experiment =An experiment in which only one variable is changed
Independent variable= The variable that is deliberately changed in an experiment
Dependent variable =The variable this is observed and changes in response to the independent variable
Hey guys! can someone write a summary on the topic of cloning?
Answer: Cloning describes the processes used to create an exact genetic replica of another cell, tissue or organism. The copied material, which has the same genetic makeup as the original, is referred to as a clone. The most famous clone was a Scottish sheep named Dolly
Explanation:
Answer:
Write your own work. I mean I know you did just had my answer deleted because I called you out the first time. So take the advice
Explanation:
8. In highly populated regions, large amounts of runoff, caused by
development, can run into nearby streams. This runoff can be warmer
than the existing water in the stream. This warm runoff will most
likely
A. kill some species of fish as they cannot handle the
higher temperature of water.
B. cause the stream to become cleaner by killing
bacteria with the heated water.
C. decrease the amount of nitrogen for plants in the
soil under the water.
D. increase the amount of oxygen available to
organisms in the water.
Answer:
quit just drop out
Explanation:
Which would most likely cause a forced migration due to loss of habitat?
a short-term change
a long-term change
death
adaptation
Answer:
short term
Explanation:
Answer:
short
Explanation:
edg
What is the original source of the energy stored in fossil fuels?
Answer:
the sun and previous organisms.
Explanation:
it's right
If a base is deleted, a _____ mutation occurs.
A. substitution
B. insertion
C. point
D. frameshift
Answer:
Option D. A frameshift mutation occurs.
Answer:
D. frameshift
Explanation:
If a base is deleted, a frameshift mutation occurs. Hope it helps you !!
12. Which has NOT been linked to acid precipitation?
a. Toxic metal poisoning
b. Lower blood pH
c. Respiratory problems
d. Damaged monuments
Answer:
D
Explanation:
Lower blood pH has not been linked to acid precipitation. So, the correct option is (B).
What is Acid Precipitation?Acid rain is defined as rain or any other form of precipitation that is abnormally acidic, meaning that it contains high levels of hydrogen ions. Most water which include drinking water, has a neutral pH that exists between 6.5 and 8.5, but acid rain has a pH level lower than this and averages between 4–5.
Acid rain can be caused by natural causes, such as volcanic eruptions, while acid rain can also caused by human activities such as the burning of fossil fuels, manufacturing, oil refineries, electricity generation, and vehicles, all of which release sulfur and nitrogen oxides into the atmosphere.
Thus, lower blood pH has not been linked to acid precipitation. So, the correct option is (B).
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13. Which of these statements about particulate matter less than 2.5 microns in diameter is true?
A. They can cause heart and lung disease.
B. They're produced from nitrogen gas (N.).
C. They're less of a threat than particulate matter that's 10 microns in diameter
D. They're the size of a human hair.
Answer:
Nitrogen Gas
Explanation:
penn foster
lesson 2
page 13
Bird species on secluded islands are highly vulnerable to extinction. The large,
flightless dodo birds native to the island of Mauritius were easy prey for predators.
Which of the following most likely contributed to the extinction of the dodo bird?
. ,
A The dodo bird species produced too many offspring.
B) The dodo bird species produced too few off pring.
The dodo bird species produced offspring with no unique traits.
The dodo bird species produced offspring with very unique traits.
Answer: im going to say C
How has genetic engineering been used by humans in the past?
NEEEDDD HELPPPP ASAPPPPP!!!!NOO ROCKYY
Answer:
4.166
Explanation:
Parasitism, mutualism, and commensalism are all forms of symbiotic relationships. How does parasitism differ from mutualism and commensalism? A. Neither organism is harmed in parasitism. B. Three or more species must be involved in a parasitic relationship. C. Both organisms are harmed in parasitism. D. One organism is harmed in parasitism.
Answer:
The answer is D, the host is only negatively affected in a parasitic relationship.
Water is carried though the trunk in the sapwood.
True
False
Answer:
true
Explanation:
New forms of drug-resistant bacteria can evolve quickly because
A
when a drug kills most of the bacteria, the ones left to breed are those that have a natural resistance to the drug.
B
when scientists genetically engineer bacteria they use natural selection.
C
scientists use extinction to selectively breed bacteria.
D
a drug causes mutations in the bacteria, leaving only mutated bacteria left to breed.
Answer:
A
Explanation:
Las subunidades que forman el ADN se denominan:
What does every living thing have to have? *
Chloroplast
Nucleus
DNA
Answer:
DNA
Explanation:
Answer:
Explanation:
Los cloroplastos son los orgánulos celulares que en los organismos eucariotas fotosintetizadores se van ocupando de la fotosíntesis. Están limitados por una envoltura formada por las dos membranas concéntricas y contienen muchas vesículas, los tilacoides, donde se encuentran organizados los pigmentos y demás moléculas que convierten la energía lumínica en energía química, como la clorofila.
El término cloroplastos sirve alternativamente para designar a cualquier plasto dedicado a la fotosíntesis, o específicamente a los plastos verdes propios de las algas verdes y las plantas. Aunque el reciente descubrimiento adiciona a más individuos en la lista, como lo es en el caso de Elysia chlorotica, que al digerir al alga Vaucheria litorea, adquiere los cloroplastos a sus tejidos, y gracias a esto, puede realizar la fotosíntesis.
Name the process through which gaseous exchange occurs.
Answer:
Diffusion
Explanation:
Diffusion is the spontaneous movement of gases, without the use of any energy or effort by the body, between the alveoli and the capillaries in the lungs.
is the statement true or false? plant cells have chloroplast, but no mitochondria?
Answer:
False
Explanation:
Plant cells have both but animal cells have only the mitochondria minus the chloroplast.
What causes 37% of all pollution?
Answer:
There are a variety of examples that cause the problematic issue of pollution- Usually air pollution can be caused by the alteration of gases, solid and liquid particles suspended into the air. If we were to contemplate on how human causes lead to pollution, vehicles exhaust fumes are possibly one of the most affecting in air pollution, as well as the exhaust from industrial factories and plants. Human reasons have majorly led to pollution.
16. The rate of weathering depends primarily upon the area's _______________________.
Answer:
Climate
Explanation:
Hope this is right :)
Sorry if I get it wrong
Some kidney diseases cause a change in the permeability of glomerular capillaries making them more permeable to plasma proteins. This changes the colloid osmotic pressure, thus drawing water out of the blood and into tissues. The result is
Answer:
The correct answer is edema.
Explanation:
When the capillaries or the tiny blood vessels within the body leak fluid, the condition known as edema takes place. This fluid accumulates in the tissues surrounding it, resulting in inflammation. Edema generally takes place due to mild conditions like consuming more salt, staying or sitting in one position for a long duration, and others.
However, in some situations, edema can also be a sign of an extreme medical condition like kidney disease. During kidney disease, the sodium and additional fluid within the circulation may result in edema. The edema related to kidney disease generally takes place around the eyes and in the legs.
please help me in Science grade 8th
Answer:
Both earthquake and volcanoes are concentrated in specific regions.
Explanation:
The distribution of earthquake on earth is concentrated in specific zones where the plate tectonic meets or fuse with each other. Volcanoes are also concentrated in specific regions on the earth. Most volcanoes are concentrated on the edges of continents, on island chains, or long mountain ranges beneath the sea. There is a great relationship between earthquake and volcanoes because volcanic eruptions is the cause of earthquake in a region.
what are the functions of the following? (Make it simple)
Vacuole
Cell Membrane
Answer:
Vacuole- Function of vacuole is they help to maintain water and minerals balance in cell.
Cell Membrance- The functions of cell membrane are:
They keep toxic substances out of the cell.It only allows sensitive material to enter and exist in cell.