A new protein has been described that transports a growth factor across the plasma membrane. This protein is most likely a/an:
A. cytoplasmic protein.
B. integral membrane protein.
C. peripheral membrane protein, facing the cytoplasmic side.
D. peripheral membrane protein, facing outward.
Answer: B
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A. live birth. B. asexual reproduction. C. sexual reproduction.
Oaks, birches and corn produce both staminate and pistillate flowers on the same plant. What term describes this type of plant?
A. monoecious B. dioecious C. hermaphroditic D. complete E. determinant
High ____ concentrations in Lake Erie encouraged the growth of photosynthetic algae, which changed the
phytoplankton community.
a. sewage b. detergent c. coliform bacteria d. phosphorous e. dead fish
The promotion of the lactose operon in
bacteria is a. activated by a repressor protein. b. independent of glucose concentration. c. activated by t lactose binding. d. regulated by RNA polymerase. e. none of these