Which hormone promotes stem elongation and was first discovered while studying the growth of extremely tall and
spindly rice plants?
a. abscisic acid
b. auxin
c. cytokinin
d. ethylene
e. gibberellin
e
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At an atmospheric pressure of 870 mm Hg with 21 percent oxygen, the partial pressure of oxygen is _____
A) 100 mm Hg B) 127 mm Hg C) 151 mm Hg D) 182 mm Hg E) 219 mm Hg
Which of the following statements about australopiths is true? a. Thin-enameled molars hint that the australopiths must have eaten a diet of soft plants and tender meat
b. Dentition shows that australopiths were carnivores. c. Australopith footprints found in Tanzania by Mary Leakey proved that they moved by knuckle-walking like modern gorillas. d. Fossils and footprints indicate that all australopiths walked upright.
The diploid chromosome number of an organism is usually represented as 2n. Humans have a diploid chromosome number of 46. What would be the expected haploid chromosome number in a human?
A) 24 B) 12 C) 23 D) 92 E) 16
If you want to get DNA from a eukaryotic cell, which of the following structures would provide the largest concentration?
A. ribosome B. nucleus C. mitochondria D. lysosome