What is unique about reverse transcripatse that makes it different from other DNA polymerases?
A. It lacks normal proofreading ability leading to many errors during replication.
B. It has ligase ability built in so host enzymes are not needed to seal up breaks in DNA made during replication.
C. It manufactures a special tRNA molecule that it uses as a primer to initiate replication.
D. It is found exclusively in DNA viruses.
Answer: A
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An invertebrate statocyst contains ____, which surround movable ____. Changes in body position
move the latter and thus trigger action potentials.
a. statoliths; sensory hair cells b. sensory hair cells; statoliths c. otoliths; sensory hair cells d. efferent neurons; otoliths e. efferent neurons; statoliths
Malaria is caused by Plasmodium falciparum, a non-motile protist that contains a cluster of microtubules at one end of the cell. Once injected into the bloodstream, these microtubules are used to attach to red blood cells. Plasmodium falciparum is which of the following?
A. a protozoan B. an alga C. a slime mold D. a diatom E. an apicomplexan
The MHC (major histocompatibility complex) is NOT important in
A. distinguishing self from non-self. B. recognizing infected cells. C. identifying bacterial pathogens. D. identifying abnormal cells. E. presenting antigenic determinants.
Abscisic acid synthesized in the root travels to different parts of the shoot where it regulates transpirational water loss. What is the most likely way that ABA travels from the root to the various locations within the shoot?
A. From cell to cell through the plasmodesmata B. Sieve tubes C. Vessels and tracheids D. Between cell walls