What does a phosphate group transfer from
ATP do to active transport pumps?
a. opens channels that allow for the movement
of solutes
b. changes their shapes
c. ionizes them
d. causes them to fuse with the surrounding
phospholipid membrane
e. destroys them
B
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How could you distinguish between the two pathogens Streptococcus aureus, which causes
strep throat, and Plasmodium falciparum, which causes malaria?
a. S. aureus does not have any genetic material. b. S. aureus is larger than P. falciparum. c. P. falciparum has membrane-bound organelles. d. S. aureus does not have a cell membrane
When populations of antelopes and cheetahs coexist, which population changes are likely to occur due to natural
selection?
What will be an ideal response?In the experiments constructed by Pasteur to disprove spontaneous generation, swan-necked flasks were used. Why was this shape of flask used in this experiment?
A. The shape of the glass neck allowed the bacteria into the flask and then into the media, but air could not enter. B. Because the glass necks were stretched out, the heat used to sterilize the medium inside of the flask could not kill the bacteria in the neck. C. The glass necks needed to be open to the air, yet constructed so that bacteria would settle in the lowest part of the neck. D. These flask shapes were the easiest and cheapest to produce.
Which statement regarding DNA packing is false?
A) A nucleosome consists of DNA wound around a protein core of eight histone molecules. B) DNA packing tends to promote gene expression. C) Highly compacted chromatin is generally not expressed at all. D) Prokaryotes have proteins analogous to histones.