The ability of a virus to infect an organism is regulated by
a. the host species
b. the type of cells
c. the availability of an attachment site
d. cell factors necessary for viral replication
e. all of the above
Answer: b. the type of cells
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The main DISADVANTAGE of excessive gluconeogenesis during prolonged postabsorptive periods is that
A. continued protein breakdown can impair enzymatic activity and plasma membrane functions. B. carbohydrate buildup in the liver impairs its function. C. the brain is exposed to levels of glucose that are too high. D. tissues other than the brain increase glucose utilization. E. glucose absorption from the gut is impaired.
Four of the following describe a bilaterally symmetrical animal. Which one is the exception?
a. It has left and right sides. b. It usually displays cephalization. c. It produces mirror images regardless of the number of "cuts" through the central axis. d. It usually has a three layer body plan. e. It can be a deuterostome.
Fungi, together with bacteria, are the principal ________ in the biosphere.
Fill in the blank(s) with the appropriate word(s).
The core of every virus particle always contains
A. DNA. B. capsomers. C. DNA and RNA. D. enzymes. E. either DNA or RNA.