Which of the following structures gives rise to endosperm?
a. zygote formed from the fusion of a sperm and an egg
b. triploid cell formed during double fertilization
c. inner wall of the ovary
d. cytoplasm of the megaspore
e. cytoplasm of the microspore
ANSWER: b
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Which vertebrates exhibits a "flow through" respiratory system?
A. mammals B. birds C. amphibians D. fishes E. birds and fishes
The transmission of information from one neuron to another has been found to occur by all of the
following mechanisms EXCEPT
a. neurotransmitters released from vesicles. b. components of a membrane can act as neurotransmitters. c. electrical connections. d. chemical signals transmitted through electrical connections. e. a gas that diffuses through a cell membrane.
Which of the following occurs in pulmonary emphysema?
a. The alveoli lose their elasticity. b. The surface area of the lung is greatly decreased. c. Walls between adjacent alveoli become reinforced. d. The heart becomes enlarged from pressure. e. Fresh air accumulates in the lungs because it cannot be properly inhaled.
A partial diploid E. coli cell of lacI+lacP+lacOc lacZ-lacY-/ lacI- lacP+ lacO+lacZ-lacY+ genotype will synthesize:
A. lacZ but not lacY gene product in the presence of lactose. B. lacY but not lacZ gene product in the presence of lactose. C. lacY but not lacZ gene product in the absence of lactose. D. neither lacZ nor lacY gene products in the presence of lactose. E. both lacZ and lacY gene products in the absence of lactose.