Which of the following herbivores is NOT a ruminant?
A. Cow
B. Horse
C. Camel
D. Deer
Ans: B. Horse
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Which of the following hormones is directly responsible for the maintenance of the uterine lining during pregnancy in mammals?
A. Melatonin B. Oxytocin C. Progesterone D. Prolactin E. FSH (follicle-stimulating hormone)
Colorblindness is more common in males than in females because the allele for colorblindness is
A) recessive and located on the X chromosome. B) recessive and located on the Y chromosome. C) recessive and located on the Y chromosome. D) dominant and located on the X chromosome.
What is the function of an acrosome?
A) It protects the sperm from vaginal secretions. B) It contains a haploid nucleus. C) It holds large numbers of mitochondria. D) It propels the sperm through the female reproductive tract. E) It contains enzymes that dissolve the protective layers around the egg.
CD4 and CD8 T cells are likely to become active when they:
A) are attracted by the inflammatory response. B) travel through lymph nodes. C) interact with B-cells. D) travel through the spleen. E) dock with a dendritic cell with a matching antigen.