The directions for each amino acid in a polypeptide are indicated by a codon that consists of ________ nucleotides in an RNA molecule
A) five
B) four
C) three
D) two
Answer: C
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The process by which bacteria and fungi break down
nitrogenous materials forming NH4+ is a. nitrification. b. ammonification. c. denitrification. d. nitrogen fixation. e. respiration.
Which of the following movements is not based on actin-myosin interactions?
a. Cell migration (crawling) over surfaces b. Chromosome movement during anaphase A c. Cytokinesis of animal cells d. Phagocytosis e. None of the above
Species in widely separated but similar biomes often appear to display similar characteristics because of
A) convergent evolution. B) coevolution. C) mutations. D) evolutionary drift.
Steve decides to make a meal for some of his friends. He uses a variety of foods to prepare the meal, including some canned mushrooms. Unfortunately, he gives his friends a mild case of botulism food poisoning. His friends report blurred vision and
trouble speaking due to a flaccid paralysis of the muscle cells by the botulinum toxin. Propose a mechanism by which this toxin would inhibit muscle contraction. What will be an ideal response?