Which of the following characterize B cells?
A. They are manufactured and mature in the bone marrow.
B. They function in antibody mediated immunity against bacteria.
C. They directly recognize antigens and undergo clonal selection.
D. All of the choices characterize B cells.
E. None of the choices characterize B cells.
Answer: D
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Which of the following is the term used to describe asexual reproduction in a single-celled organism?
(a) cytokinesis (b) mitosis (c) binary fission (d) all of these are correct
Which of the following have little value as antiseptics, but are used to mechanically remove microbes?
A. biguanides B. quats C. chlorines D. soaps
The jellylike mixture of water and solutes enclosed by a cell's plasma membrane is known as _____.
A. cytosol B. nucleus C. organelle D. plasma membrane E. cytoplasm
The EC50 for PTC
A. is the concentration of PTC that gives 50% of the maximal response B. is determined in HEK cells by observing changes in cytoplasmic Ca +2 C. is determined by measuring the fluorescence of a molecule that changes its properties when bound to Ca+2 D. all of the above