The cell cycle is controlled in most cells by
A) a series of checkpoints.
B) time-after a certain length of time the cell divides.
C) the completion of one phase which triggers the beginning of the next.
D) cell size, when the cell reaches a certain size, it divides.
E) different cells exhibit different control strategies, any of the 4 above can be found in eukaryotic organisms.
A
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You are a doctor who examines a swollen and warm puncture wound on the hand of a patient. Next door, a vet examines the same puncture wound on the foot of a dog. Are you and the vet seeing the same immune responses?
A. Yes, because dogs have innate immune systems but not adaptive immune systems. B. Yes, because dogs have adaptive immune systems but not innate immune systems. C. No, because the immune response is unique to humans. D. Yes, because vertebrates have both adaptive immune systems and innate immune systems. E. No, because the foot of a dog is a completely different structure than the hand of a patient.
Which group of animals are living representatives of the theropods, a lineage of bipedal predatory dinosaurs?
a. birds b. crocodiles and alligators c. snakes and lizards d. turtles e. mammals
The convergence in external morphology of
sharks, penguins, and porpoises is attributed to a. reduced genetic variability in these groups. b. selection pressures that are common to these groups. c. reproductive isolation of these groups. d. identical genes in all three groups. e. use and disuse of the limbs
Ockham’s razor could also be called the principle of ____
a. parsimony b. selectivity c. identity d. homogeneity e. exceptionalism