Helper T cells secrete ________ to stimulate the proliferation of B-cells.

A. antigens
B. antibodies
C. MHC proteins
D. cytokines


Ans: D. cytokines

Biology & Microbiology

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An octopus "tastes" with:

a. its mouth b. its nose c. receptors on its head d. its tentacles e. its skin

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The organs that eliminate waste from the body do not include ________

A) skin B) lungs C) heart D) kidneys

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What is a leaf blade attached to a stem by a stalk-like structure?

A) internode B) stoma C) petiole D) node

Biology & Microbiology

Figure 41.13A The disease acquired from the mother during childbirth shown in the above infant photograph is caused by ____.

A. syphilis B. gonorrhea C. chlamydia D. HPV E. AIDS

Biology & Microbiology