In C3 plants, the ____ are typically closed at night and open during the daytime to allow for gas exchange
a. grana
b. stomata
c. cuticles
d. epidermis
e. spongy mesophyll
b
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Progressive changes in the fossil record are evidence for evolution because
A. they show descent with modification. B. they show inheritance of acquired characteristics. C. they show evolutionary change at the level of the individual. D. they show gaps in the fossil record.
Restriction enzymes are useful in creating recombinant DNA molecules because they
A) generate "sticky ends" by cutting at the same sequence in any DNA source. B) are found only in human cells, where they naturally mend broken DNA strands. C) are used to encapsulate and transport foreign DNA into cells of the target organism. D) stimulate DNA amplification so that the desired cells or their products can be scaled up.
For humans and most vertebrates the body is supported primarily by
a. an exoskeleton. b. only nonskeletal structures. c. a hydrostatic skeleton. d. an endoskeleton. e. joined exo- and endoskeletons.
A beta-pleated sheet is an example of a protein’s tertiary structure
__________________Indicate whether the statement is true or false.