The only protists that have 2 types of nuclei in each cell are
a. Archaeplastida.
b. Dinoflagellates.
c. Ciliates.
d. Excavates.
e. Amoebozoans.
C
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Red blood cells are formed at a rate of
a. 2?3 million per second. b. 2?3 million per minute. c. 2?3 million per hour. d. 10 million per day. e. 50 million per hour.
Initial attempts to culture cells demonstrated that blood serum but not blood plasma provided factors that increased the viability and proliferation of the cultured cells
What will be an ideal response?
Clonal selection and differentiation of B cells activated by antigen exposure leads to the production of _____
A) large quantities of the antigen initially recognized B) vast numbers of B cells with random antigen-recognition receptors C) long-lived erythrocytes that can later secrete antibodies for the antigen D) short-lived plasma cells that secrete antibodies for the antigen
In evaluating the hypothesis test on experimental data, all the following will change the resulting test statistic except for what?
A. Number of subjects receiving the treatment B. Hypothesized value in the null hypothesis C. Number of subjects receiving the control D. Confidence level