__________ and __________ are single-celled heterotrophs with a secreted shell. Fill in the blank(s) with the appropriate word(s)
Foraminiferans; radiolarians
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The immune system normally discriminates between ________ antigens.
A. primary and secondary response B. B and T cells C. self and nonself D. humoral and cell-mediated
In rapidly dividing cells, expression of BRCA1 and BRCA2 genes is the highest during the ____
a. mitosis to cytokinesis transition b. G1/S transition and into S phase c. G2/mitosis transition d. S/G2 transition e. metaphase to anaphase transition
Which of the following statements about B cells is true?
A. Some B cells become memory cells. B. B cells change into plasma cells after encountering an antigen and then produce antibodies. C. B cells develop and mature in the bone marrow. D. B cells carry receptor molecules on their cell surfaces. E. All of these are true.
Under what conditions would you expect a plant to have the highest concentration of abscisic acid (ABA)?
A) wet tropical rain forest B) cool environment after a heavy rain C) houseplant growing in low light conditions D) desert after a long drought