The first humans appeared in the fossil record in the _____
a. paleocene
b. eocene
c. oligocene
d. miocene
e. pleistocene
Ans: e. pleistocene
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Rocky Mountain juniper (Juniperus scopulorum) and one-seeded juniper (J. monosperma) have overlapping ranges. Pollen grains (which contain sperm cells) from one species are unable to germinate and make pollen tubes on female ovules (which contain egg cells) of the other species. These two juniper species are kept separate by _____.
A) habitat isolation B) temporal isolation C) gametic isolation D) behavioral isolation E) isolation
Which of the following plants are capable of
secondary growth?
a. ferns b. horsetails c. club mosses d. conifers e. liverworts
Which discovery was determined about DNA from x-ray diffraction data?
a. DNA is uniform in length. b. DNA is short and narrow. c. DNA has a repeating pattern. d. DNA molecules are flat. e. DNA molecules are round.
Peptidoglycan is a compound in ____
a. bacterial flagella b. bacterial cell walls c. archaean cell walls d. archaean flagella e. eukaryote cell walls