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3 years ago

An__ is a variation of a gene.

Biology

1 answer:

goldenfox [79]3 years ago

5 0

Answer:

Genetic variability refers to a species's genetic variation as a whole. Specific changes in DNA fragments or genes are referred to as genetic variants, and each mutation of a gene is referred to as an allele.

Explanation:

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Environmental degradation decrease the production. why

schepotkina [342]

Environmental degradation decreases production because it obliterates the environment for the survival of plants and crop species by miscellaneous factors.

<h3>What is Environmental degradation?</h3>

Environmental degradation may be characterized as the deterioration of the environment through a deficiency of natural resources such as air, water, and soil. In other words, it may refer to the obliteration of ecosystems and the termination of wildlife.

It influences productivity by cutting down forests and trees, privileging their livestock to overgraze in fertile lands and devastate its productivity, utilization of harmful chemicals in agricultural practices, farming in marginal lands, etc.

Therefore, it is well described above.

To learn more about Environmental degradation, refer to the link:

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2 years ago

_____ splits water into 1/2 O2, H , and e- . A structure of a thylakoid. Letters from A to E indicate definite structures. Lette

Sauron [17]

The luminous reactions begin when light reaches photosystem II. The water molecules provide electrons to the photosystem, releasing oxygen and protons. The letter A represents photosystem II that splits water.

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1. Luminous energy is trapped by chlorophyll in Photosystem II.

2. When the pigment molecules absorb light, electrons provided by water molecules get in a higher energy level.

3. The excited electrons go through the electron transport chain from Photosystem II to a less energetic level in photosystem I.

4. When the excited electrons leave photosystem II, they are replaced by new electrons extracted from the water molecules.

5. Luminous energy absorbed move the electrons from the photosystem I to another electron acceptor, from where they get transported again and used to produce NADPH molecules.

6. When electrons leave Photosystem I, they are replaced by new electrons coming from photosystem II.

7. When the water molecule breaks down, hydrogen ions remain in the thylakoid lumen, from where they are pumped to the stroma by the ATP synthase.

8. The released energy is used to produce ATP molecules.

9. Hydrogen ions go back from the stroma to the thylakoid compartment.

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3 years ago

What is the basic structure and function of Nucleic Acids?

nevsk [136]

Nucleic acids are long chainlike molecules that carry genetic information which is read in cells to make RNA and proteins by which living things function.

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3 years ago

Explain the significance of meiosis in sexual reproduction

iogann1982 [59]

Answer: Meiosis produces the sex cells, that is the gametes (sperm cells and eggs) that unite to form a zygote. Meiosis ensures that the gametes have have haploid chromosomes so that the resulting zygote from their fusion will have diploid chromosomes.

Explanation: Meiosis is a type of cell division in which a cell divides twice to produce four daughter cells each with the half the number of chromosomes as the parent cell. Without meiosis new gametes are not produced. Meiosis ensures that the chromosomes are evenly distributed among the daughter cells and that each daughter cell contains 23 chromosomes. A sperm cell with 23 chromosomes fuses with an egg with 23 chromosomes to form a zygote with 46 chromosomes. If meiosis does not occur, gametes with haploid chromosomes will not be produced, and if the gametes have diploid chromosomes because meiosis does not occur, sexual reproduction will be a disaster because when two diploid gametes fuse the resulting zygote with be abnormal.

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4 years ago

A student is investigating the effect of plants on inbox air quality and states if plants are added to an indoor environment the

Bezzdna [24]

So all we know is that the student stated something ("if plants are added to an indoor environment the air quality will improve "). This is only a statement - it's not a test whether this statement is true yet.

So the correct answer is: it is a hypothesis.

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4 years ago

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