The skin is waterproof, not allowing water to come in or out. Which protein is most responsible for this property?
A. Carotene
B. Keratin
C. Melanin
D. Sebum
Answer: B
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Postpartum, estrogen and progesterone levels
A. rise steeply. B. rise gradually. C. fall steeply. D. fall gradually.
The major histocompatibility complex
a. was first observed in virally infected fish. b. is a group of cells responsible for presenting antigens to B-cells to stimulate antibody production. c. is a cluster of genes which encode self-antigens. d. is the membrane glycoprotein and associated antigen presented to B-cells. e. none of these.
The total number of ATP generated by the breakdown of glucose is 38, but the net number of ATP generated is
A. 24. B. 2. C. 40. D. 36. E. 30.
A sudden rise in blood pressure in the carotid artery would
A) initiate the baroreceptor reflex. B) cause a reduction in heart rate and force of contraction. C) produce a reflex coordinated by the cardiac center in the medulla oblongata. D) All of the answers are correct. E) None of the answers are correct.