Antibodies are secreted by:
A) basophils.
B) macrophages.
C) plasma cells.
D) T cells.
C) plasma cells.
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Which of the following questions is answered during the G2 checkpoint of the cell cycle?
a. Have all chromosomes been replicated without damage? b. Are conditions favorable for cell division to begin? c. Are all chromatids attached correctly to the spindle microtubules? d. Are there adequate reserves to release the cell?
Duplication of DNA occurs
A. during interphase. B. before meiosis II only. C. during prophase I. D. twice, before meiosis I and meiosis II.
A rhizome is a horizontal aboveground stem
____________________ Indicate whether the statement is true or false.
Cells use active transport proteins to
A.) obtain molecules they need. B.) break down molecules. C.) engulf large particles. D.) detect the charge of molecules.