In humans with a very mild form of anemia, the hemoglobin molecule is affected by which of the following mutations?
A. Base-pair substitution
B. Deletion
C. Insertion
D. Frameshift mutation
E. Intron mutation
Answer: A
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Anthropogenic events ____
a. refer to the carbon cycle b. refer to all nutrient cycles c. originate with human activities d. refer to absorption of the sun’s energy in the atmosphere e. are caused by human overpopulation
DDT breaks down in the environment fairly quickly
Indicate whether the statement is true or false
What is the function of the stem part of the Y-shaped antibody (that is, the part formed by the two heavy chains joined together)?
a. It recruits immune cells to destroy the antibody antigen clump. b. It stimulates T cells to attack bacteria and other foreign cells. c. It attaches to foreign antigens, producing a large antibody antigen clump. d. It attaches the antibody to the B cell membrane. e. It has proteolytic activity, degrading viral proteins.
Clownfish and sea anemones live together each benefiting the other. The clownfish protects the sea anemone from predators and the sea anemone provides food and protection for the clownfish. This relationship is called
a) commensalism b) predation c) parasitism d) mutualism