Cells that lack ribosomes cannot
A. eliminate wastes.
B. produce energy.
C. package cellular products.
D. engage in protein synthesis.
E. ingest and phagocytize bacteria.
D
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When the kidney secretes hydrogen ions:
a. the pH of the urine rises b. sodium ions are added to the urine also c. the bicarbonate ion is added to the urine also d. none of the above
Which of the following illustrates a positive feedback mechanism?
A) Body temperature control
B) Control of blood sugar
C) Maintaining blood pressure
D) Uterine contractions during childbirth
Drugs that lead to birth defects in the formation of the limbs are most damaging when the conceptus is exposed to them during weeks
A. 1-2 of development, before the placenta is fully formed. B. 4-8 of development, when limbs are undergoing peak development. C. 12-16 of development, when limbs have formed but are not fully mature. D. 24-28 of development, when plasticity of surrounding tissues has been lost.
Jill is running a marathon. Which of the following is not occurring while she runs?
A. Constriction of the afferent arterioles B. Increased urine production C. Increased ADH production D. Decreased rate of glomerular filtration E. Decreased urine production