The DNA-containing central cell structure found in plant and animal cells is absent in bacterial cells is nucleus.
What is nucleus?The part of a cell that houses the chromosomes in biology. The membrane-enclosed nucleus is where RNA is synthesised from the chromosomal DNA.
DNA is organised into chromosomes in the nucleus, which is located in the centre of the cell.
The double nuclear membrane (outer and inner) that separates the nucleus from the cytoplasm, known as the nuclear envelope, envelops it. The rough endoplasmic reticulum and the outer membrane are one unit.
The nucleolus' main job is to facilitate ribosome biogenesis by assembling and digesting rRNA into preribosomal particles.
Bacterial cells lack the nucleus, the primary cell structure that houses DNA, that is present in plant and animal cells.
Thus, nucleus is only present is eukaryotic cells.
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What is an example of codominance?
A flower with pink petals that results from the cross
a of a plant with red petals with a plant with white
petals
b Blood type o
c Skin color
A flower with red and white petals that results from
d the cross of a plant with red petals with a plant with
white petals
Answer:
Explanation:
dnanananans
Answer:
It’s D
Explanation:
I jus did it.
A cross of a red cow (RR) with a white bull (WW) produces all roan offspring (RW). This type of inheritance is known as:
sex-linked
complete dominance
codominance
incomplete dominance
Answer:
Codominance
Explanation:
Both parents carry a dominant trait, so the offspring will have a coat of main colour, and also some hairs of another colour.
How do Venus flytraps protect themselves from predators?
Answer:
Insects are protected by a chitin exoskeleton. The Venus flytrap cracks this protective shell using special digestion enzymes that are produced once the sensory hairs register a stimulus. It will ebb away if the hairs are not further stimulated.
Answer:
I do believe that the Venus flytrap is a predator because it is a carnivorous plant. The plant's trap is a single large leaf with trigger hairs.
Explanation:
Is the mass–kinetic energy relationship directly proportional (as one variable increases, the other increases) or inversely proportional (as one variable increases, the other decreases)?
Answer:
The kinetic energy of a moving object is directly proportional to its mass and directly proportional to the square of its velocity.
Explanation:
The mass-kinetic energy relationship is ; Directly proportional
The Kinetic energy of an object is directly proportional because an increase in the kinetic energy of a moving object leads to an increase in the mass of the object and also to the increase in the velocity of the object squared.
i.e. K.E ( kinetic energy ) = [tex]\frac{1}{2} mv^2[/tex]
Hence we can conclude that the mass-kinetic energy relationship is directly proportional.
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The more classification levels that two organisms share,
A) Group of answer choices
B) The easier it is to tell them apart
C) The more directly related they are
D) They closer together on Earth they live
The more twins they are
Answer:A or the more twins they are
Explanation:
Which of the four factors that affect evolution apply to the finches that the Grants studied? Use
evidence from your research to support your answer. (15 points)
Answer:
Natural Selection in Real Time
"When we made the comparison between the size of the offspring generation and the population before selection, we found a measured, evolutionary response had taken place and it was almost identical to what we had predicted."
-Peter Grant
Darwin thought that evolution took place over hundreds or thousands of years and was impossible to witness in a human lifetime. Peter and Rosemary Grant have seen evolution happen over the course of just two years.
The Grants study the evolution of Darwin's finches on the Galapagos Islands. The birds have been named for Darwin, in part, because he later theorized that the 13 distinct species were all descendants of a common ancestor. Each species eats a different type of food and has unique characteristics developed through evolution. For example, the cactus finch has a long beak that reaches into blossoms, the ground finch has a short beak adapted for eating seeds buried under the soil, and the tree finch has a parrot-shaped beak suited for stripping bark to find insects.
The Grants have focused their research on the medium ground finch, Geospiza fortis, on the small island of Daphne Major. Daphne Major serves as an ideal site for research because the finches have few predators or competitors. (The only other finch on the island is the cactus finch.) The major factor influencing survival of the medium ground finch is the weather, and thus the availability of food. The medium ground finch has a stubby beak and eats mostly seeds. Medium ground finches are variable in size and shape, which makes them a good subject for a study of evolution.
The first event that the Grants saw affect the food supply was a drought that occurred in 1977. For 551 days the islands received no rain. Plants withered and finches grew hungry. The tiny seeds the medium ground finches were accustomed to eating grew scarce. Medium ground finches with larger beaks could take advantage of alternate food sources because they could crack open larger seeds. The smaller-beaked birds couldn't do this, so they died of starvation.
In 1978 the Grants returned to Daphne Major to document the effect of the drought on the next generation of medium ground finches. They measured the offspring and compared their beak size to that of the previous (pre-drought) generations. They found the offsprings' beaks to be 3 to 4% larger than their grandparents'. The Grants had documented natural selection in action.
While beak size is clearly related to feeding strategies, it is also related to reproduction. Female finches tend to mate with males that have the same size beaks. These factors together can add to the development of new species.
The Grants return each year to Daphne Major to observe and measure finches. They have been collecting data on the finches for over 25 years and have witnessed natural selection operating in different ways under different circumstances.
25 POINTS PLEASE HELP. Check the correct column(s) for each description *
Prokaryotes
Eukaryotes
Contains cytoplasm
Do NOT have membrane-
bound organelles
Cells do NOT have a nucleus
Can be unicellular or
multicellular
Have ribosomes
Have cell membranes
Have genetic material
(DNA/RNA)
Plants and animals
Answer:
1. Both
2. Prokaryotes
3. Prokaryotes
4. Eukaryotes
5. Both
6. Both
7. Both
8. Eukaryotes
One of the differences between embryonic stem cells and adult stem cells is ?
Answer:
One major difference between adult and embryonic stem cells is their different abilities in the number and type of differentiated cell types they can become. Embryonic stem cells can become all cell types of the body because they are pluripotent.
The smallest living things we have around, thanks to this tool they were eventually found – What is it?
Color-blindness results from both the expression of a single recessive sex-linked allele (b.)
Which of the following is a genotype of a colorblind male?
XbY
XBXB
XBY
XbXb
Answer:
XbY
Explanation:
because the question asks genotype of a male, the chromosomes would be XY, so XBX and XbXb can be eliminated leaving only XBY and XbY. XBY is incorrect because the question states that colorblindness is represented by lowercase b, so the correct answer is XbY.
list 3 ways soils are classified
Answer:
Soils are composed of mixtures of mineral and organic materials, but are classified according to the size of their mineral particles. The three main texture groups are sandy, silty, and clay.
Sandy soil contains particles that can be seen with the naked eye and feels gritty when rubbed between the thumb and forefinger. Sandy soils will generally not stick together when wet.
Silty soil contains particles, which are smaller than sand particles but larger than clay particles. Silt feels powdery when rubbed between the thumb and forefinger. Silty soil sticks together when wet, but will not hold its shape after it is dry.
Clay soil contains the smallest particle size. Clay particles form a sticky soil when wet and will generally hold a shape after drying. Soils are rarely composed of just sand, silt, or clay. They are usually a mixture of the three with a larger percentage of one size of particles.
Answer:
Depending upon the average grain-size and the conditions under which soils are formed and deposited in their natural state, they may be categorized into following types on the basis of their structure: In the grain-size classification, soils are designated according to the grain-size or particle-size. The more common classification systems are enlisted below: Geological Classification
Classification by Structure
Classification based on Grain-size
Unified Soil Classification System
Preliminary Classification by soil types
Based on the agencies responsible for their present state, soils may be classified under following types: Residual Soils
Transported Soils:
Alluvial or sedimentary soils
Aeolian soils
Glacial soils
Lacustrine soils
Marine soils.
Then you have inorganic and organic soils.
Explanation:
one of the seed banks has been storing seeds of a rare and endangered plant to keep the seeds fresh.120 of the seeds of this plant were selected to be grown out of this 120 seeds only 90 germinated
what percentage of the seeds was not fertile?show all your working
Answer:
25%
Explanation:
According to this question, a seek stored seeds of a rare and endangered plant. In order to ensure that the seeds remain fresh, 120 seeds are selected to be grown. However, out of these 120 seeds, only 90 germinated. This means that only 90 of 120 seeds are fertile.
This further means that (120-90) = 30 seeds are infertile and hence, could not germinate. In percentage, this can be represented as:
30/120 × 100
= 1/4 × 100
= 100/4
= 25% of the selected seeds are infertile.
The Rolling Plains ecoregion lies west of the Crosstimbers area of Texas and at elevations between 900-4000 ft. The Rolling Plains is a part of the central United States Great Plains system. Like the Crosstimbers ecoregion, it has rolling hills. These topographical features are due to the several rivers that flow through this ecoregion.
The rivers in the area weather and erode the land, forming __________ in this area.
Answer: plateaus
Explanation: there not canyons so you can cross that off and its not the dunes nor the deltas so if you look at the picture you can tell it is the plateaus
Rivers in the area weather and erode the land, forming a mouth in this area.
MouthIt is the place where a stream of water, such as a river, empties. Thus, a river can have as its mouth another river, a large lake, a pond, a sea or the ocean.
With this information, we can conclude that the rivers in the area weather and corrode the land, forming a mouth in this area.
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state the shape of the bacterium used in the investigation of preventing bacterial growth
Answer:
Bacterial cells come in different shapes: from rods, to spheres, to spirals
Explanation:
HHEELLPPP!!!! this is also due in 45 mins
This is all in the legs btw it would help a lot if u could answer it
Look online and find out what each muscle group does and what at least 5 muscles do and list that information.
Flexor Group-
Peroneal Group-
Hamstring Group-
Gluteal Group-
Quadricep Group-
Extensor Group-
Sartorius Group-
Adductor Group-
Answer:
Flexor Group- group of five muscles mainly in charge of movements of forearm, hand and fingers.
Peroneal Group- these muscles play a role in the movements of the ankle joint and support of the foot.
Hamstring Group- The hamstrings are a group of muscles and their tendons at the rear of the upper leg. They include the biceps femoris, semitendinosus, and semimembranosus. The hamstrings flex the knee joint and extend the thigh to the back side of the body.
Gluteal Group- The gluteal muscles are a group of three muscles which make up the buttocks: the gluteus maximus, gluteus medius and gluteus minimus. The three muscles originate from the ilium and sacrum and insert on the femur.
Quadricep Group- The Latin translation of 'quadriceps' is 'four headed,' as the group contains four separate muscles: the vastus lateralis, vastus medialis, vastus intermedius, and the rectus femoris. Each of the vastus muscles originates on the femur bone and attaches to the patella, or kneecap.
Extensor Group- The superficial extensors of the forearm are a group of six muscles situated in the superficial posterior compartment of the forearm. These muscles include the brachioradialis, extensor carpi radialis longus, extensor carpi radialis brevis, extensor digitorum, extensor carpi ulnaris and extensor digiti minimi.
Sartorius Group- couldnt find anything
Adductor Group- The adductors are a group of muscles, as the name suggests, that primarily function to adduct the femur at the hip joint. Although they are all located somewhere along the medial side of the thigh, they originate in different places at the front of the pelvis.
Explanation:
Brainliest pleeeeeeeeeeease
When a thin plant or animal leaves an impression in sediment that becomes sedimentary rock, this is a _____________________ fossil.
Answer:
Petrified fossils
Explanation:
HELP ME!!
what is the Chemical Equation for Cellular Respiration???
(I am bad at biology!!)
Answer:
Cellular Respiration: C6H12O6 + 6O2 → 6CO2 + 6H2O.
Explanation:
So long ago they used a sundial to tell it. It starts with a “t” if you want me to spell it – what is it?
Answer: time
Explanation:
Explain two ways to study biotic and abiotic factors within an ecosystem.
[tex] \sf{ \huge}{ \colorbox{pink}{ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: }}[/tex]
Ecologists study both biotic and abiotic factors and how they interact. Therefore, ecologists often use methods and data from other areas of science, such as geology, geography, climatology, chemistry, and physics.
Abiotic factors refer to non-living physical and chemical elements in the ecosystem. Abiotic resources are usually obtained from the lithosphere, atmosphere, and hydrosphere. Examples of abiotic factors are water, air, soil, sunlight, and minerals
[tex] \sf{ \huge}{ \colorbox{pink}{ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: }}[/tex]
Through geology and geography, we can study biotic and abiotic factors within an ecosystem.
How can you study biotic and abiotic factors within an ecosystem?The interactions between biotic factors, such as organisms like flora and fauna, and abiotic factors.
For example, all animals (biotic factors) breathe in oxygen (abiotic factor). All plants (biotic factor) absorb carbon dioxide (abiotic factor) and need water (abiotic factor) to survive.
Thus, geology and geography, are the two ways to study biotic and abiotic factors within an ecosystem.
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What happens to food and air when they enter the body?
While taking a nature walk with their class, students observe many mushrooms growing among the fallen leaves on the forest floor.
– What is the role of mushrooms in the forest ecosystem?
– What other type of organism performs a similar role in the forest ecosystem?
This is for a writing thing can u guys write about it I really need help thank u
Answer:
The mushrooms act as decomposers, there are many other species that also does this such as worms
Please HELP!!WILL GIVE BRAAIN!!!
Answer:
False
Explanation:
Pluripotent stem cells are master cells. They're able to make cells from all three basic body layers, so they can potentially produce any cell or tissue the body needs to repair itself.
Pluripotent stem cells have the ability to undergo self-renewal and to give rise to all cells of the tissues of the body (but not the placenta).
A pea plant with purple flowers is crossed with a pea plant that has white flowers. All the offspring are purple, so we can conclude that
Answer:
That the purple trait is dominant and the purple pea plant has a gene type of PP and the white flower has a gene type of pp
10 points
41
Which statement best describes how a vaccination can help protect
the body against disease?
Vaccines directly kill the pathogen that causes the disease,
Vaccines act as a medicine that cures the disease
Vaccines cause the production of specific molecules that will react with and destroy
certain molecules
Vaccines contain white blood cells that engulf harmful germs and prevent them from
spreadin throughout the bodyg
vaccines cause the production of specific molecules that will react with and destroy
Can you guys help me?
Answer:
first one is active transport sorry cant help with the rest
Explanation:
Some of the sugars produced by photosynthesis are stored as starch in the roots. Explain, as fully as you can, why it is an advantage to the plant to store carbohydrates as starch rather than as sugar.
Answer:
It's insoluble
Explanation:
Starch is better than glucose for storage because it's insoluble.
Insoluble meaning it can't be dissolved.
A strand of RNA has the sequence AUUGCGCGAA. What explanation can be made about how this strand came to be?
A. The RNA strand formed from the rearrangement of the bases in a DNA strand.
B. The RNA strand broke off from a DNA strand that had a much longer genetic code.
C. The RNA strand was transcribed from a DNA strand with the sequence TAACGCCTT.
D. The RNA strand was translated from a DNA strand that had the sequence UAACGCCUU.
A strand of RNA with the sequence "AUUGCGCGAA" has been transcribed from a DNA strand with the sequence "TAACGCCTT". Thus, the correct option is C.
What is Transcription?Transcription is the process of formation of mRNA from the DNA in the nucleus of cell. The machinery involving all the enzymes and nucleotides are present in the nucleus for the development of mRNA. mRNA is the messenger RNA which is transcribed from DNA.
The sequence of mRNA formed from the DNA in a cell is complementary to the leading strand of the DNA in which only the thymine residues are replaced by the uracil residues. Adenine base pairs with uracil and thymine residues base pairs with adenine residues. Cytosine residues base pairs with guanine residues and vice versa.
Thus, the sequence of DNA from which mRNA has been synthesized is "TAACGCCTT".
Therefore, the correct option is C.
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sub atomic particles found in protons and neutrons are what?
Answer:
thus , protons and neutrons are no more indivisible than atoms are ; indeed , they contain still smaller particles , which are called quarks . quarks are as small as or smaller than physicists can measure
Explanation:
In a solution, salt is considered the
solute
solvent
Answer:
Solvent
Explanation:
If the AG of a reaction was -31.45 kJoules, you would know that:
A. the products have more free energy than the reactants.
B. the reaction requires an energy input of 31.45 kJoules to proceed.
C. the reaction most likely leads to development of a more ordered system
D. the reaction is spontaneous
Answer:
The correct answer is - option D. the reaction is spontaneous. (considering it as delta G or ΔG)
Explanation:
If a chemical reaction has a negative ∆G it means the reactants have more free energy than the products due to the fact that they give off some of their free energy during the reaction.
Such reactions release free energy and therefore called exergonic reactions. These reactions are also known as spontaneous reactions as they do not require energy to take place.
Thus, the correct answer is - option D.