The structural genes of the lactose operon are: (Select all correct choices)
A. always expressed unless the operon is
turned off by a repressor.
B. turned on in the presence of lactose.
C. turned off by the presence of lactose.
A,C
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In most eudicots, a short stalk called a ____ attaches the leaf to a stem
a. vascular bundle b. petiole c. node d. bundle sheath e. stomata
In a pedigree chart, a female who does not demonstrate the trait being studied is represented by a
a. darkened square. b. clear diamond. c. clear circle. d. darkened triangle. e. darkened oval.
"Sticky ends" are:a
the single-stranded ends of a DNA segment created by some restriction enzymes. b. a problem in recombinant DNA technology because they form loops of single-stranded DNA. c. double-stranded ends of a DNA segment created by some restriction enzymes. d. sites of the origin of replication in prokaryotes. e. sugar molecules that are bound to the ends of a DNA fragment
The type of cleavage pattern represented in Figure 51-1 is:
a. holoblastic and radial.
b. holoblastic and spiral.
c. meroblastic and radial.
d. meroblastic and spiral.
e. holoblastic and mosaic.