Molecular Biology and Genetics

It has 4.7 million base pairs.

Correct Answer: hydrogen bonds between base

Correct Answer: TCGATTTCG

It is a double helix structure.

Prokaryotes have circular DNA not coiled into chromosomes. It has no histone unlike eukaryotes.

In B-DNA, the most common double helical structure, the double helix is right-handed with about 10–10.5 base pairs per turn. In B-DNA, the major groove is wider than the minor groove. Given the difference in widths of the major groove and minor groove, many proteins which bind to B-DNA do so through the wider major groove.

Correct Answer: Both 1 and 2

Phenylketonuria (PKU) is an inborn error of metabolism involving impaired metabolism of phenylalanine.

A codon is a sequence of three DNA or RNA nucleotides that corresponds with a specific amino acid or stop signal during protein synthesis. DNA and RNA molecules are written in a language of four nucleotides.

The correct option is (1).

The complementary base-pairing rules of DNA-to-RNA and RNA-to -RNA give the codon and anticodon. Recall also that there is no thymine in RNA; uracil and adenine are complementary bases for RNA.

The nucleosome model explains the packaging of histone proteins and DNA in the chromatin material, which forms the chromosome.

On each strand, 50,000 spirals would occur. One spiral has 10 nucleotides. Therefore, 500000/10 spirals = 50000 spirals.

Gene mutation or point mutation is the result of a change in the nucleotide sequence of the DNA molecule in a particular region of the chromosome. Gene mutation occurs in the form of duplication, insertion, deletion, inversion or substitution of bases. The addition or deletion of a base may change the reading frame of nucleotide sequence. This is called frame-shift mutation.

Yes, it is correct.