You are examining the DNA sequences that code for the enzyme phosphofructokinase in skinks and Komodo dragons
You notice that the coding sequence that actually directs the sequence of amino acids in the enzyme is very similar in the two organisms but that the surrounding sequences vary quite a bit. What is the most likely explanation for this?
(a) Coding sequences are repaired more efficiently.
(b) Coding sequences are replicated more accurately.
(c) Coding sequences are packaged more tightly in the chromosomes to protect them from DNA damage.
(d) Mutations in coding sequences are more likely to be deleterious to the organism than mutations in noncoding sequences.
(d)
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Coral reefs, atolls, and islands are the result of the buildup of coral
(a) polyps. (b) medusae. (c) exoskeletons. (d) wastes.
A new compound developed in the lab was tested as a DNA mutagen. When the Ames test was performed, the results were numerous bacterial colonies following exposure. This result means
A) the chemical is safe. B) the chemical is radioactive. C) the chemical is a carcinogen and a low-level mutagen. D) the chemical is a mutagen and may also be a carcinogen. E) the chemical can be moved to human trials.
Ecdysone inhibitors could be used as insecticides
Indicate whether the statement is true or false.
The effect of colcemid on cells is to stop division at anaphase. Indicate whether the statement is true or false