Which structure gives strength and rigidity to a plant cell? A. nucleus B. chloroplast C. mitochondrion D. cell wall

During which part of the cell cycle is the duplicated genetic material within the nucleus of a parent cell separated to creat tw

dlinn [17]

I think the answer is B

Beacuse It follows the successful completion of S phase, during which the cell's DNA is replicated. Mitosis is a part of the cell cycle process by which chromosomes in a cell nucleus are separated into two identical sets of chromosomes, each in its own nucleus.

5 0

3 years ago

The type of lipid formed from rings of carbon atoms which regulate sexual function, blood glucose levels and are an important co

lions [1.4K]

The type of lipid formed from rings of carbon atoms which regulate sexual function, blood glucose levels and are an important component in <u>cell membranes</u> are known as Steroids.

Steroids- A steroid is an organic molecule having four rings organized in a certain chemical configuration that is physiologically active. The two main biological roles of steroids are as signaling molecules and as critical elements of cell membranes that affect membrane fluidity.

Cell Membrane- All cells have a cell membrane, also known as a plasma membrane, which divides the inside of the cell from the external environment. The movement of materials into and out of the cell is controlled by the cell membrane.

To know more about the Steroids, click on the below link,

brainly.com/question/10105654

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6 0

2 years ago

Natural selection and genetic drift are two mechanisms of evolution that can lead to speciation. Define both natural selection a

timofeeve [1]

<h2>Evolution </h2>

Explanation:

Genetic drift

Genetic drift is change in allele frequencies in a population from generation to generation that occurs due to chance events
The genetic drift occurs due to random fluctuation of any allele in a gene pool and is more efficient in small population
The founder effect and the bottleneck effect are cases in which a small population is formed from a larger population which means they may experience strong drift for generations
In founder effect a genotype from a homogeneous gene pool migrate to a newer habitat and colonize there and form a newer community which leads to the genetic drift to the original population, speciation which occurs in this effect is the peripatric speciation
In bottleneck effect the elimination of inferior genotype from a homogeneous gene pool occurs due to the strong selection pressure and changing environmental conditions which leads to genetic drift and a only a few most adapted genotype survives and flourish

Natural Selection

Natural selection is a selection pressure which operates in a population and allow the best fitted genotype to survive in changing environmental conditions and eliminate the other genotype which are not fit
Genetic drift, mutation and sexual selection are important causes of natural selection
Directional natural selection favours the superior genotype and eliminate the inferior and intermediate genotype, in the history of evolution the most common natural selection is directional natural selection
Stabilizing natural selection favours the intermediate genotype but eliminates the extreme genotype
Bidirectional natural selection favours the extreme genotypes but eliminate the intermediate genotypes

5 0

3 years ago

Which kind of organic molecule is ear wax? (lipid, carbohydrate, protein, or nucleic acid)?

PolarNik [594]

Hello there! The kind of organic molecule would be:

Lipid

Hope this helps! :)

3 0

3 years ago

Read 2 more answers

The conversion of nitrogen gas to compounds useful to crops is called

Marrrta [24]

Nitrogen fixation is the compound

8 0

3 years ago