How does radiation therapy work on cancer cells?
A) Radiation limits microtubule formation, affecting chromosome alignment during mitosis.
B) Radiation causes tumor cells to stick together, making them easier to remove.
C) Radiation damages DNA in cells so that cells can no longer grow and divide.
D) Radiation makes cancer cells divide so fast that they may develop extra mutations and die.
C
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Microbial symbionts are horizontally transferred by parental cells directly passing on the symbionts during meiosis
Indicate whether the statement is true or false.
The only marsupial mammal living in North America is the
A. opossum. B. raccoon. C. ring-tailed cat. D. weasel. E. wombat.
Environmental air temperature can fluctuate many degrees during the course of a day. A human's body temperature
A. can also fluctuate many degrees. B. must be maintained within a range of a few degrees. C. is raised by sweating and dilation of blood vessels in the skin. D. is not maintained internally but fluctuates with the air temperature. E. is lowered by shivering.
Drosophila eggs acquire an initial asymmetry before fertilization as a result of
A. maternal DNA molecules being deposited in one end of the egg. B. nurse cell migration to one end of the egg. C. production of bicoid proteins in one end of the egg. D. attachments of cadherins to one end of the cell. E. maternal mRNA being deposited in one end of the egg.