Plants are able to defend themselves against viruses that have invaded their cells by:
A. producing antibodies.
B. recognizing and interrupting viral RNA
replication.
C. causing the virus to detach from the cell
membrane before it injects its RNA.
D. producing sticky proteins on the cell
surface that capture the viruses.
E. increasing the number of plasmodesmata
per cell.
B
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Why do researchers think the first self-replicating molecule was RNA?
A) RNA is the only type of molecule that can catalyze a chemical reaction. B) RNA can carry information and catalyze chemical reactions. C) Self-replicating molecules of RNA exist today, in human cells. D) Fossil evidence of such a molecule was recently discovered.
Which of the following statements explains why restriction enzymes are not useful for genome-wide studies of genetic variation?
A. There is simply too much DNA that has to be cut in order to get any information. B. The differences in restriction sites are evened out when looking at the entire genome. C. Using restriction enzymes will only tell us differences in sequence variation in restriction sites. D. Restriction enzymes only recognize sequences found in genes. E. None of the answer options is correct.
Which system relies on the activity of both skeletal and smooth muscle?
a. skeletal b. sensory c. respiratory d. nervous e. endocrine
Summarize the results of performing genome-wide searches for genes that control obesity.What will be an ideal response?