In contrast to a eukaryotic chromosome, a prokaryotic chromosome
(a) is shorter and fatter
(b) has a single loop of DNA
(c) never replicates
(d) contains many histones
(e) all of these are correct
Ans: (b) has a single loop of DNA
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Which of the following is not a protective mechanism seen in the stomach?
A. rapid division by and replacement of epithelial cells B. secretion of proteinases as zymogens C. mucus secretion D. salivary amylase E. All of these are mechanisms which protect the stomach
Which of the following is a potential mechanism through which proteins can acquire novel domain architectures over evolutionary time?
A) protein cleavage B) exon shuffling C) mutation in a pseudogene D) duplication and divergence E) de novo mutation
Which of the following structures is made of membranes?
A. nucleolus B. centriole C. chloroplast D. ribosomes
Drugs known as beta-lactams interfere with bacterial (DNA/folic acid/cell wall) synthesis
What will be an ideal response?