If Leydig cells were unable to respond to GnRH, what effect would this have on spermatogenesis?
A. Spermatogenesis would be unaffected.
B. Spermatogenesis would increase.
C. Spermatogenesis would decrease.
D. Spermatogenesis would stop.
E. The overall process of spermatogenesis
would take longer.
A
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The comparison between Parazoa and Eumetazoa is best described by which of the following statements?
A. Parazoa have only one kind of cell whereas Eumetazoa have many kinds. B. The various kinds of cells of Parazoa do not form permanent associations into tissues or organs whereas Eumetazoa possess true, stable tissues. C. Parazoans are only haploid, whereas eumetazoans are diploid with haploid sex cells. D. Parazoans invert during their development whereas eumetazoans do not. E. All of the choices provided are correct.
Answer the following statements true (T) or false (F)
1.Estrogen is a male sex hormone. 2.Follicle-stimulating hormone (FSH) is only found in females. 3.Birth control pills only contain estrogen. 4.Sea urchins display external fertilization. 5.Fruit fly development expression of the bicoid gene on one end of the embryo is necessary for proper head positioning.
Some humans have heritable traits that make them resistant to infection by HIV. In areas of the world where HIV infection rates are high, are human populations evolving? Explain your logic.
a. No. HIV infection rates would not affect human evolution. b. Yes. The heritable traits that confer resistance to HIV should increase over time. c. No. The heritable traits that confer resistance to HIV should decrease over time. d. Yes. The heritable traits that confer resistance to HIV should decrease over time.
What is a disadvantage of cloning as a propagation technique?
A) Cloning produces monocultures that can potentially be wiped out by a single disease. B) Cloning is more expensive and more difficult than growing from seeds. C) Cloning is time-consuming, with slow results. D) Cloned organisms are dangerous and unpredictable.