Which of the following immune system cells is most severely depleted by HIV/AIDS ?
(A) Plasma B cells
(B) Memory B cells
(C) Helper T cells
(D) Cytotoxic ("Killer") T cells
Ans: (C) Helper T cells
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An animal cell that is hypertonic will likely do which of the following?
a. Shrivel b. Burst c. Remain stable d. Lyse
Which of the following was a successful seed-bearing plant that protected its developing seeds inside cones?
a. green algae b. conifers c. sea-dwelling plants d. flowering plants e. a plant with vascular tissues
In mammals, which of the following substances is produced in a muscle that operates anaerobically?
(A) Citrate (B) NADPH (C) Lactate (D) Oxygen
Which of the following is an example of sex-limited inheritance?
A) cat fur length B) hemophilia C) beard formation in humans D) hair color in humans E) human baldness