Each ________ fragment of an antibody molecule contains the variable regions of a heavy and light chain that folds into a groove for one epitope.
A. terminal
B. variable
C. Fc
D. FAb
E. hinge
Answer: D
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Blood flows from the left ventricle
a. to the aorta. b. to the left atrium. c. to the pulmonary artery. d. to the pulmonary vein. e. to the right ventricle.
Recent expeditions into New Guinea found
a. dozens of new species of animals. b. plants that had plate-sized flowers. c. a bird that was thought to be extinct. d. New Guinea has a history of several billion years. e. all of these.
Researchers found E. coli that had mutation rates one hundred times higher than normal. Which of the following is the most likely cause of these results?
A) The single-stranded binding proteins were malfunctioning. B) There were one or more mismatches in the RNA primer. C) The proofreading mechanism of DNA polymerase was not working properly. D) The DNA polymerase was unable to add bases to the end of the growing nucleic acid chain.
Drought and floods are considered to be density-dependent factors potentially affecting population size.
Answer the following statement true (T) or false (F)