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
Biology & Microbiology
The organs that eliminate waste from the body do not include ________
A) skin B) lungs C) heart D) kidneys
Biology & Microbiology
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