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#Question id: 2875

Which of the following statements is/are CORRECT from the following?

I. The chromosome of the small monkey DNA virus SV40 is a circular, double-helical DNA molecule of 5000 bp.

II. The phage Lambda genome is a linear single-stranded molecule in the virion particle.

III. Circular DNA molecules purified from both bacteria and eukaryotes are usually negatively supercoiled, having values of sigma of approximately –0.06.

IV. Prokaryotes have a special type I topoisomerase known as “DNA gyrase” that introduces, rather than removes, negative supercoils.

V. DNA disentanglement, generally catalyzed by a type II topoisomerase, is also required for a successful round of DNA replication and cell division in eukaryotes.

#Unit 2. Cellular Organization

  1. II and IV

  2. II, IV and V

  3. I, IV and V

  4. I, III and V

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#Question id: 11959

#Unit 7. System Physiology – Animal

The process by which digested dietary substances cross cell membranes to be used by the body is known as ________.
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#Question id: 11576

#Unit 7. System Physiology – Animal

The amino acid tyrosine is a starting substrate for the synthesis of :
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#Question id: 2877

#Unit 2. Cellular Organization

What is the superhelical density of a closed-circular DNA with a length of 4,200 bp and a linking number (Lk) of 374? What is the superhelical density of the same DNA when Lk = 412? Are these molecules negatively or positively supercoiled?

A. The molecule is getting negatively supercoiled.

B. The molecule is getting positively supercoiled.

C. The superhelical density is positive.

D. The superhelical density is negative.

Which of the combinations of the above statements are correct?
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#Question id: 19461

#Unit 13. Methods in Biology

Phase-contrast microscopy is suitable for observing which kind of sample?
1. Single cells 
2. Group of cells
3. Thin cell layers
4. Thick cell layers
Which of the following options is correct?
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#Question id: 29118

#Unit 6. System Physiology – Plant

Which one of the following statements related to photosynthesis is NOT correct?