Which of the following factors do not influence the length of a covalent bond?
(a) the tendency of atoms to fill the outer electron shells
(b) the attractive forces between negatively charged electrons and positively charged nuclei
(c) the repulsive forces between the positively charged nuclei
(d) the minimization of repulsive forces between the two nuclei by the cloud of shared electrons
(a)
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When solutions of host cells and infectious virions are mixed and spread on an agar plate, ________ form where viruses lyse the host cells
A) insertion sequences B) plaques C) prophages D) colonies
We have a family of genes that code for different forms of myosin. How could this family of genes have arisen?
A. There is duplication of the original myosin gene, and the resulting copies have diverged. B. Two different original genes accumulated mutations and converged on myosin. C. There is duplication of the original myosin gene without divergence. D. Lateral gene transfer from a bacterium occurs as a result of infection.
The immunochemical test that involves the agglutination of an artificial carrier particle with the antigen bound to its surface and an antibody present in a specimen is referred to as:
a. double immunodiffusion. b. counterimmunoelectrophoresis. c. particle agglutination. d. enzyme immunoassay.
All of the following statements are true about squid EXCEPT
A. digestion occurs in the stomach and a cecum. B. squid are continuous feeders. C. the mouth has jaws that bite off pieces of prey with the help of a toothy radula. D. the squid's tentacles seize its prey. E. squids are molluscs.