During C4 photosynthesis:
a) plants utilize less ATP when producing sugar.
b) plants are able to produce sugars only during the daytime.
c) plants are able to continue producing sugars even when they must close their stomata to reduce water loss during hot days.
d) plants are able to reduce water loss by producing more rubisco.
e) plants are able to generate water molecules to cool their leaves.
Ans: c) plants are able to continue producing sugars even when they must close their stomata to reduce water loss during hot days.
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If a virus enters the lytic phase in a host's cell, it will cause the host cell to
A. reject the virus. B. shrink because of the loss of cytoplasm that has been used in the synthesis of viral DNA. C. lysis due to the action of enzymes D. replicate itself at a higher than normal frequency. E. initiate an attack on the virus.
At __________, the fusion of two gametes produces a(n) __________. Fill in the blank(s) with the appropriate word(s)
Sphincters
a. are circular muscles. b. prevent backflow. c. are smooth muscles. d. are found at the entrance and exit of the stomach. e. include all of these.
Celiac disease is an autoimmune disorder which destroys the microvilli of the small intestine. Vitamin B12 can be absorbed by passive diffusion across the microvilli of the small intestine. Consider a patient who has had 10% of their microvilli destroyed. If the concentration of vitamin B is 0.6 pg/ml inside the lumen of the small intestine and 0.3 pg/ml on the inside of an epithelial cell, how is the diffusion rate of vitamin B altered in this patient?
A. It is increased by 10%. B. It is reduced by .3%. C. It is reduced by .003%. D. It is reduced by 10%. E. It is increased by .3%.