Which of the following bacteria are found
inside the roots of legumes?
a. thermophilic bacteria
b. cyanobacteria
c. nitrogen-fixing bacteria
d. methane-producing bacteria
e. halophilic bacteria
C
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Which is NOT an example of a motor protein?
a. myosin b. dynein c. venosin d. kinesin
The figure below shows five water molecules. The hydrogen bonds shown in this figure are each between
A) two hydrogen atoms.
B) an oxygen and a hydrogen atom of the same water molecule.
C) an oxygen and a hydrogen atom of different water molecules.
D) two atoms with the same charge.
Which of the following statements is (are) true concerning the vitelline layer of the sea urchin egg?
A) It is outside the fertilization membrane. B) It releases calcium, which initiates the cortical reaction. C) It has receptor molecules that are specific for binding acrosomal proteins. D) A and B are true. E) A, B, and C are true.
Which statement is accurate about Homo erectus and Homo ergaster?
A. H. erectus and H. ergaster are identical, except that H. erectus had tools and fire, and H. ergaster did not. B. H. erectus essentially looks like a modern human, while H. ergaster is very apelike. C. H. erectus evolved into H. ergaster and was supplanted by H. ergaster. D. H. erectus walked upright, while H. ergaster still walked on all fours. E. The fossils look very similar, but H. erectus is an Asian form and H. ergaster is the African form.