The tuft of fenestrated capillaries at which filtration takes place in the mammalian kidney is referred to as the
A. collecting duct.
B. proximal convoluted tubule.
C. glomerulus.
D. renal corpuscle.
E. Bowman's capsule.
Answer: C
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Only nine types of aneuploids are known in newborns because
A) only nine chromosomes undergo nondisjunction. B) most types of aneuploids are lethal early in development. C) most aneuploids do not cause detectable defects. D) most aneuploids do not affect the phenotype.
Which type of plant hormone was first discovered in experiments to define the nutrient media required
for plant tissue culture?
a. gibberellins b. cytokinins c. salicylic acid d. auxins e. brassinosteroids
During the Proterozoic period photosynthetic cells
caused a. changes in the course of evolution due to production of oxygen. b. massive extinctions due to the production of chemical neurotoxins. c. the color of the oceans to change from blue to green. d. land formation due to the sediment buildup in shallow seas. e. none of these.
Transferring Euglena into a dark environment results in the loss of photosynthetic pigment. What conclusion does this support?
A. Euglenoids are neither plant-like or animal-like protists. B. Euglenoids are closely related to plants. C. Euglenoids are obligate photoautotrophs. D. Light triggers heterotrophy.