Which molecules are examples of effector molecules?
A) Allolactose and Trp
B) Lac repressor and Trp repressor
C) The promoter and operator
D) lacY and lacZ
E) Lactose and glucose
A) Allolactose and Trp
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When a ________ enters a host cell, it loses the outermost protein layer and is then referred to by virologists as a double-layered particle (DLP).
Fill in the blank(s) with the appropriate word(s).
Homologous chromosomes
a. may exchange parts during meiosis. b. have alleles for the same characteristics even though the gene expression may not be the same. c. are in pairs, one chromosome of each pair from the father and one from the mother. d. pair up during meiosis. e. fit all of these descriptions
In a cross involving plants with round/wrinkled
seeds, yellow/green pods, and tall/dwarf stems, the researcher is actually observing __________traits. a. 4 b. 3 c. 6 d. 12 e. none of these
What do the large female cones of a pine tree contain?
a. pollen b. antheridia c. microspores d. megasporangia e. microsporangia