Agents that cause mutations are called mutagens. All of the following are examples of mutagens EXCEPT
A) cigarette smoke. B) vitamins.
C) ultraviolet radiation. D) X-rays.
B
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The adaptive significance of sexual reproduction is that it:
A. diversifies genotypes thereby allowing faster evolutionary responses to changing environments B. is more fun than asexual reproduction C. is more rapid than sexual reproduction D. promotes the dispersal of individuals more effectively E. All of the other choices provided are incorrect
Some bacteria have a higher incidence rate of thymine dimer mutations following exposure to UV light than others. What might be going on here to lead to this outcome?
A. They may simply have a higher proportion of T nucleotides next to each other in their DNA sequences than other bacteria, leading to more possible dimers being formed. B. They may have a stronger expression of photoreactivation enzymes, leading to more thymine dimers being formed and retained. C. They may have a weaker expression of photoreactivation enzymes, leading to more thymine dimers being formed and retained. D. They may simply have a higher proportion of T nucleotides next to each other in their DNA sequences than other bacteria, leading to more possible dimers being formed AND they may have a stronger expression of photoreactivation enzymes, leading to more thymine dimers being formed and retained. E. They may simply have a higher proportion of T nucleotides next to each other in their DNA sequences than other bacteria, leading to more possible dimers being formed AND they may have a weaker expression of photoreactivation enzymes, leading to more thymine dimers being formed and retained.
Glycolysis literally means
a. energy producing. b. Embden-Meyerhof. c. sugar producing. d. sugar splitting.
The organisms that most specifically utilize light energy to make organic molecules from inorganic molecules are
A. heterotrophs. B. photohemitrophs. C. photoautotrophs. D. photoheterotrophs. E. photoisotrophs.