Where does spermatogenesis occur?
A. vas deferens
B. ovaries
C. lobules of the testes
D. bulbourethral gland
E. urethra
Answer: C
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You observe a houseplant on your window sill bending toward the bright afternoon sunlight. Being knowledgeable, you wish to explain the molecular events of the phototropic response to your friend. What is the correct sequence that you would describe?
I. PHOT1 attains a phosphate group, and changes shape II. cell elongation occurs on the shady side of the plant III. auxin binds its receptor at target tissues IV. light strikes PHOT1 V. PHOT1 stimulates downward auxin transport on the shady side of the plant VI. light strikes stomates, which close, minimizing water loss VII.cells on the illuminated side of the plant become shorter A) VI, VII, II B) VII, II, III, I C) IV, I, V, III, II D) IV, VI, III, VII E) any of these sequences can initiate phototropism
All of the following are components associated with the bacterial cytoskeleton except
A) FtsZ. B) MreB. C) plaktin. D) crescentin. E) both choices B and C
The primary producers associated with hydrothermal vents are ____
a. dinoflagellates b. archaea c. red algae d. diatoms e. sea kelp
One of the first medical tests a newborn receives determines if the child has phenylketonuria (PKU). PKU is the result of a mutation in a single gene that causes mental retardation and a host of other phenotypes (light hair and skin color, eczema, and a "mousy" smell). By detecting PKU early, doctors are able to reduce the effect of this condition with a modified diet. PKU is an example of
a. epistasis b. pleiotropy c. polygenic trait d. codominance e. incomplete dominance