Which accessory organ's secretions neutralize stomach acid before it reaches the intestines?
A. The liver
B. The pancreas
C. The gallbladder
D. The salivary glands
Answer: B
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Hammer-head bats are a species of African fruit bats. During the breeding season, males gather in mating arenas, where they display to females who pass through and assess males before selecting individuals with which to mate
This is an example of ____ (intra/inter) sexual selection. Fill in the blank with the appropriate word.
Prevents supercoiling ahead of the replication fork
A. DNA ligase B. DNA primase C. Topoisomerase D. DNA polymerase I E. DNA polymerase III
In opsonization with IgG, why would it be important that IgG react with the antigen BEFORE a phagocytic cell recognizes the antibody molecule?
A. If the IgG is bound to the phagocyte BEFORE opsonization, it would most likely be ingested by the phagocyte before it could bind to a pathogen (it would be "naked," so to speak). B. Binding of IgG by phagocytes would block the antigen binding sites on the IgG molecules, preventing them from binding to the microbes. C. Binding of IgG by phagocytes changes their conformation-and by changing their protein conformation, their antigen binding sites are changed and they can no longer recognize their specific antigenic epitopes. D. Binding of antibody by phagocytes results in immediate release of protein-destroying enzymes to the outside of the cell. Since antibodies are proteins, they would be destroyed by these enzymes (and would then be unable to bind to their specific antigenic epitopes).
Are all the disulfide bonds in insulin between the two chains?
a. yes b. no