The source of diversity for B and T cell
receptors is
a. mitosis.
b. meiosis.
c. transcript processing.
d. random recombination of genes.
e. gene transcription.
D
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The ion, _____, causes proteins associated with actin to move out of the way allowing _____
to bind to binding sites on _____.
Fill in the blank(s) with the appropriate word(s).You are doing research on rodent populations in a cornfield at night and are hearing popping noises. Your research assistant is getting scared. Having taken biology, you can explain to your assistant that the popping sound is due to
A. the apical meristem cells in the corn stalks elongating. B. the developing of the kernels of corn on the ears of the corn stalks. C. the expansion of the lateral meristems increasing the girth of the corn stalk. D. the growth of the intercalary meristems inside the corn stalk. E. the development of the tassels on top of the corn stalk.
Some bacteria have membranes around their
DNA. What is lacking in these membranes that we do not call them nuclei?
a. pores b. proteins c. phospholipids d. a bilayer construction e. more than one of these is lacking
leu- bacteria are mixed in a flask with leu+ bacteria, and soon all bacteria are leu+. However, if the leu- cells are on one side of a U-tube, which is divided into two compartments by a filter with fine pores, and the leu+ cells are on the other, the leu- cells do NOT become prototrophic. Which process is likely to produce this observed result?
A. transduction B. transfection C. transformation D. reciprocal translocation E. conjugation