17. A CMP contains a cytosine and a phosphate group b. a. a cytosine, a ribose,

Question

17. A CMP contains a cytosine and a phosphate group b. a. a cytosine, a ribose, and a phosphate group a cytosine, a deoxyribose, and a phosphate group c. d. a cytosine, a methionine, and a phosphate group 18. Two strands of DNA are held together by many a. Phosphodiester bonds b. Hydrogen bonds c. Hydrophobic interactions d. All of these 19. For a double-stranded DNA, which of the following base ratios always equal to 12 a. (A+ T/ (G+C) b. (A +Gy (C+ T) c. A/C d. G/T e. None of them 20. A double-stranded DNA is 10,000 base pairs (bps), what is the length of this DNA molecule? a. 34,000 nm b. 3,400 nm c. 340 nm d. 34 nm 21. When do the two sister chromatids of each chromosome separate during mitosis? a. S phase b. Prophase c. Metaphase d. Anaphase 22. During metaphase, spindle fibers attach to the of each chromosome? a. Centromere b. Telomere c. Long arm d. Short arm e. Anywhere 23. In a DNA molecule, G and C are paired by a. A phosphodiester bond b. One hydrogen bond c. Two hydrogen bonds d. Three hydrogen bonds e. None of these 24. In eukaryotes, DNA is replicated during a. S stage b. G? stage c. Gz stage

Explanation / Answer

17. A CMP contains

a. a cytosine and a phosphate group

b, a cytosine, a ribose, and a phosphate group

c. acytosine, a deoxy ribose, and a phosphate group

d. a cytosine, a methionine, and a phosphate group

ANSWER is: b. a cytosine, a ribose, and a phosphate group

EXPLANATION :

Cytidine monophosphate abbreviated CMP. It is a nucleotide used as a monomer in RNA. CMP consists of the phosphate group, pentose sugar ribose, nucleobase cytosine.

18. Two strands of DNA are held together by many

a. Phosphodiester bonds

b. Hydrogen bonds

c, Hydrophobic interactions

d, All of these

ANSWER is : b. Hydrogen bonds

EXPLANATION:

Each DNA molecule consists of two twisted strands of bases to form double helix and these the two strands are held together by hydrogen bonds between pairs of bases.


19. ANSWER is: (A+G) / (C+T)

EXPLANATION:

Chargaff's experiment explained that two types of bases are in a one-to-one ratio.

A+G = C+T ( purines = pyrimidines )

20. ANSWER is: a.. 34,000 nm

EXPLANATION:

The approximate length of a DNA molecule containing 10,000 base pairs is :

3.4 Å × 10,000 = 34,000 Å = 3.4 µm = 3400 nanometres

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