What is the minimum number of aminoacyl-tRNA synthetase enzymes needed to attach amino acids to all the various tRNA molecules?
A. 64
B. 61
C. 20
D. As many as there are different tRNAs
Answer: C
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Why is mutation described as the only process that can increase genetic variation?
A. It is the only process that can produce new alleles. B. It is the only process that changes allele frequency. C. It is the only process that cannot be influenced by artificial selection. D. It is the only process that is not random. E. It is the only process that can produce deleterious results.
You are presented with an animal that resembles a jellyfish. As you examine it further, which characteristic would allow you to conclude that it belongs to the Phylum Ctenophora rather than the Phylum Cnidaria?
A. complete digestive tract. B. tentacles. C. gonads. D. stinging cells.
Which of the following is NOT a function of the eukaryotic cytoskeleton?
A) anchors organelles B) gives shape to the cell C) packages cellular secretions D) performs endocytosis E) aids in contraction of the cell
Despite your best attempts to convince her otherwise, your friend is very afraid of spiders and all "bugs," which to her means insects. When you note that spiders are not insects, she claims they are the same thing. You finally convince her that spiders are not insects because, for one thing, spiders
A. lack an exoskeleton. B. are segmented. C. have a calcium-carbonate layer outside the exoskeleton. D. have two body segments joined by a pedicel.