Mosquito-transmitted roundworms cause a tropical disease called ____
a. trematodiases
b. human echinococcosis
c. lymphatic filariasis
d. onchocerciasis
e. dracunculiasis
ANSWER: c
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Which of the following is NOT found in a prokaryote?
A) DNA B) a cell wall C) a mitochondrion D) a plasma membrane
What is the name for the type of hormone, secreted by the pituitary that regulates other endocrine organs?
A) tropins B) somatostatins C) somatotropins D) growth hormones
You cut your finger, and after putting pressure on the wound for several minutes, you notice that it is still bleeding profusely. What may be the problem?
A) Platelets are not functioning properly, or there are too few to be effective. B) Mast cells are not releasing their chemical messengers. C) There are too many antigens to allow clotting. D) Hemoglobin levels are too high to allow clotting.
You have two purified samples of protein Y: the wild-type (nonmutated) protein and a mutant version with a single amino acid substitution
When washed through the same gel-filtration column, mutant protein Y runs through the column more slowly than the normal protein. Which of the following changes in the mutant protein is most likely to explain this result? (a) the loss of a binding site on the mutant-protein surface through which protein Y normally forms dimers (b) a change that results in the mutant protein acquiring an overall positive instead of a negative charge (c) a change that results in the mutant protein being larger than the wild-type protein (d) a change that results in the mutant protein having a slightly different shape from the wild-type protein