Stomata open when K+ concentration in guard cells ____, followed by water ____ the guard cells by osmosis
a. increases; entering
b. decreases; entering
c. decreases; leaving
d. increases; leaving
e. increases H+; leaving
ANSWER: a
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The gastrovascular cavity of a sponge serves important functions in both the circulatory and ____ systems
a. digestive b. endocrine c. muscular d. reproductive e. urinary
Malarial parasites are able to evade the active immune response by
a. remaining inside the host cells throughout the whole infection, thereby avoiding exposure to antibodies in the bloodstream. b. secreting substances that block the binding and recognition of their protein by host B cells. c. changing their coat proteins so that the host antibodies in current production cannot bind to them. d. overwhelming the immune cells and antibodies by an enormous production of parasitic cells. e. interfering with the production of memory cells, so that subsequent infections are just as deadly as initial ones..
Which pair represents the correct complementary bonding of nitrogen containing bases in a DNA molecule?
a. adenine and cytosine b. adenine and guanine c. cytosine and thymine d. guanine and cytosine e. guanine and thymine
Which of the following pairs is mismatched?
A) Rickettsia — intracellular parasite
B) Brucella — gram-negative aerobic rods
C) Francisella — gram-positive facultatively anaerobic pleomorphic bacillus
D) Bacillus — gram-positive endospore-forming rods
E) None of the pairs is mismatched.