Some viruses are said to be naked because
A. They have a bilipid membrane instead of the capsid layer
B. They have no bilipid membrane
C. They have no capsid proteins
D. The do not have cell wall
E. None of the above
Ans: B. They have no bilipid membrane
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Which of the following statements about the strands of a newly replicated DNA molecule is correct?
A. Both strands are made up of newly assembled nucleotides. B. One strand is new and the other is from the original molecule. C. Both strands contain some nucleotides from the original molecule. D. The sugar-phosphate chains are conserved and new bases are inserted between them. E. The base pairs are conserved and new sugar-phosphate backbones are built up on them.
Which trait is not found in all chordates?
a. a dorsal nerve cord b. a postanal tail c. an internal backbone d. a notochord
Why do some bread recipes suggest letting the dough rise in a warm place after kneading?
A. The metabolic rate of yeast slows down at warmer temperatures, so more sugar is maintained and the bread is sweeter. B. Yeast cannot carry out fermentation at room temperature. C. Warming the bread slightly before cooking it in a hot oven stretches out the gluten. D. The metabolic rate of yeast speeds up at warmer temperatures, so more carbon dioxide is released and the dough rises more quickly.
Which of the following is a function of the cell cycle that involves mitosis in eukaryotes?
A. cell replacement B. sexual reproduction C. production of gametes D. speeding up evolution