In ____ immunity, the response is immediate, the antigen is detected by a fixed set of receptors, and the response does
not persist.
a. innate
b. adaptive
c. antibody-mediated
d. cell-mediated
e. autoimmunity
ANSWER: a
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Bartel's research group showed that an RNA replicase ribozyme could be created by _____
A) carefully synthesizing a novel ribozyme monomer by monomer based on the sequence of known ribozymes B) creating large numbers of random RNA segments and testing each one to see if any replicase activity was present C) starting with random components and allowing selection to result in molecules that were better and better at replicating D) examining protein replicases and reverse-engineering an RNA molecule capable of doing the same job
The rabies virus is transmitted to humans by
A. contamination of scratches with saliva from an infected animal. B. the bite of an infected animal. C. aerosols of the virus that can be present in caves where bats roost. D. All of the choices are correct.
The first plants evolved rapidly during which time period?
a. Triassic b. Silurian c. Devonian d. Ordovician e. Carboniferous
A somatic cell from a corn plant normally contains 20 chromosomes. How many sister chromatids would that cell contain during G2 of the cell cycle?
A. 20 B. 10 C. 40 D. 0