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

Biology & Microbiology

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The process by which bacteria and fungi break down

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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

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Species in widely separated but similar biomes often appear to display similar characteristics because of

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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?

Biology & Microbiology