The sperm structure that helps penetrate the egg cell is the ________
A) midpiece
B) tail
C) ATP
D) acrosome
D
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Can you distinguish between the chromatograms of an Aa individual and an AA individual?
a. Yes b. No
On the Pacific island of Guam, large herbivorous bats called "flying foxes" commonly feed on cycad seeds, a potent source of neurotoxins. The flying foxes do not visit male cones. Consequently, what should be true?
A) The flying foxes are attracted to cycad fruit and eat the enclosed seeds only by accident. B) Flying foxes are highly susceptible to the effects of the neurotoxins. C) The flying foxes assist the beetles as important pollinating agents of the cycads. D) Flying foxes can be dispersal agents of cycad seeds if the seeds sometimes get swallowed whole (in other words, without getting chewed).
In relation to how animals can gain and lose body heat, infrared cameras are detecting the loss of heat from bodies due to what sort of temperature movement?
What will be an ideal response?
For the lac operon in E. coli, under conditions in which glucose is absent and lactose is present, which of the following is true?
a. CRP and cAMP together are bound to the DNA, and LacI is bound to the operator site. b. The lac operon is not transcribed because lactose is present. c. CRP and cAMP together are bound to the DNA, and allolactose is bound to LacI. d. The lac operon is not transcribed due to catabolite repression because glucose is absent.