<span>Carbohydrates provide 4 calories per gram, and they are the primary source of energy for the body.
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Answer: When two homologous chromosomes transfer genetic information in prophase 1.
Explanation:
Meiosis is a process in which the a single parent (diploid) cell divides twice to produce four haploid daughter cells which have half the number of chromosomes as that of their parents.
Crossing over can be defined as exchange of genetic material that occurs between the chromosomes of opposite germ line. This process helps in transfer of mixing of traits to the offspring from both parents. This occurs in prophase 1 stage of meiosis. This process is the basis of formation of gametes or sex cells that are eggs in female and sperm cells in the male. The paired homologous chromosomes from single parent align to form a bivalent so that cross over each other and a unique combination of trait develop after this process.
Based on the structure and arrangements of nucleotides in the <u>DNA </u>molecule, the molecule is an information molecule. It stores instructions and is read to produce proteins that direct cellular reproduction, produce new cellular components, and initiate cellular reproduction.
<h3>Describe DNA.</h3>
Deoxyribonucleic acid is referred to as a DNA Trusted Source. It includes units known as nucleotides, which are biological building blocks.
For most other organisms in addition to humans, DNA is an essential chemical. Our genes and genetic material, which are what gives us our individuality, are both found in our DNA.
<h3>What is the DNA's structure?</h3>
A DNA molecule is created from a group of nucleotides. There are three components in each nucleotide:
- a phosphate group
- a sugar
- a base of nitrogen
The name of the sugar in DNA is 2-deoxyribose. The "backbone" of the DNA strand is made up of these sugar molecules that are in alternation with phosphate groups.
In a nucleotide, each sugar is joined to a nitrogen base. Nitrogen bases come in four main varieties in DNA. They consist of:
- adenine (A)
- cytosine (C)
- Thymine(T)
- guanine (G)
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<span>Plants and animals all have a range of limiting (ecological minimum and maximum) for certain environmental factors. The organism will survive provided the temperature, humidity, air etc are maintained within critical limits.</span>
