Cytokines
A. inhibit production of T and B cells.
B. are soluble proteins that act as signaling molecules to stimulate white blood cells.
C. are secreted by macrophages to stimulate the replication of cancer cells.
D. repel neutrophils from the site of infection.
Answer: B
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Refer to the accompanying figure. What is the function of the structure labeled as 4?
a. To insulate the axon b. To release neurotransmitters c. To synthesize cell body organelles d. To receive inputs from other neurons e. To send retrograde signals to the cell body
Chloroplasts arose by endosymbiosis of ______.
A. an aerobic bacterium B. a photosynthetic bacterium C. an anaerobic bacterium D. an aerobic archaeon E. a photosynthetic archaeon
Cell markers composed of both carbohydrate and lipid molecules are known as (glycoproteins/glycolipids/glycogen).
Fill in the blank(s) with the appropriate word(s).
Which of the following diseases is NOT associated with bacteria that form endospores?
A. tetanus B. anthrax C. gangrene D. botulism E. toxic shock syndrome