Cells that help initiate the adaptive immune response by placing microbial antigens on their surfaces are generally referred to as:
A) regulatory T cells.
B) B cells.
C) antigen-presenting cells.
D) helper T cells.
E) mast cells.
Answer: C
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You have type A blood (genotype IAi). Who can you donate blood to in an emergency?
a. type O only b. type AB only c. type A only d. types A and B, not O e. types A and AB
Before the banning of DDT, which animals were most devastated by its use?
a. bald eagles b. peregrine falcons c. ospreys d. brown pelicans e. all of these
What structure prevents food from entering the larynx?
A) Respiratory membrane B) Intercostal muscle C) Epiglottis D) Diaphragm E) Bronchus
Fruit ripening represents an example of positive feedback. Which one of the following statements accurately justifies why the process of fruit ripening involves positive feedback?
A) Once seeds have reached maturity, chemical signals increase enzymatic activity in fruit to convert sugars into starches, thicken pulp, and maintain color in the fruit. B) Once seeds have reached maturity, chemical signals block enzymatic steps that normally convert sugars into starches and sugars accumulate from photosynthetic activity within the fruit. C) Chemical signals initiate a process that triggers enzymatic activity, which involves converting starches into sugars, softening of pulp, and color change of fruit. D) Chemical signals shut down enzymatic activity within the fruit, which results in breakdown of starches into sugars, softening of pulp, and color change of fruit.