The waxy substance on leaf surfaces is the:
A. cuticle.
B. stomata.
C. epidermis.
D. leaf hair.
E. mesophyll.
A
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Archaea use molecules with reactive side chains in their plasma membrane, so the tails of archaeal phospholipids form covalent bonds with one another. As a result, the plasma membrane is ____
a. more fluid b. less rigid c. less fluid d. able to contain more membrane proteins e. easily disturbed
Adding a fibrinogen inactivator to blood would prevent:a
the formation of thrombin. b. platelet formation. c. the blood from clotting. d. constriction of the blood vessels. e. hemoglobin synthesis.
What is the name of the tubules that make up the relatively simple excretory system used by flatworms?
a. Malpighian tubules b. nephrons c. metanephridia d. protonephridia
In general, most DNA viruses multiply in the host cell's ________, while most RNA viruses multiply in the host cell's ________.
A. cytoplasm; cell membrane B. cell membrane; cytoplasm C. cytoplasm; nucleus D. nucleus; endoplasmic reticulum E. nucleus; cytoplasm