Bush beans grow as small bushes rather than as vines because their internodes are short and they branch close to the apical meristem. Which substance, if applied to a bush bean, might cause it to elongate its internodes and grow as a vine?
A) a cytokinin
B) a gibberellin
C) abscisic acid (ABA)
D) ethylene
Answer: B
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Humans are susceptible to scurvy because
A. they cannot synthesize amino acids. B. they do not have enough adipose tissue for vitamin A storage. C. they cannot synthesize vitamin C. D. they have a high incidence of fruit allergies. E. constant seasickness and nausea on long voyages leads to weakness and anemia.
Macroevolution may have been caused by
a. changes in homeotic genes. b. small, cumulative genetic changes. c. exaptation. d. allopatric speciation. e. more than one of these.
During normal DNA replication, why is part of the DNA at the ends of linear chromosomes NOT copied into the new DNA strands?
a. because DNA ligase cannot join pieces at the end of a chromosome b. because RNA primers at the beginning of a new strand cannot be replaced with DNA c. because those ends are Okazaki fragments that are lost d. because cells do not need the DNA at the ends of chromosomes
Untreated sewage is released into a river. Which of the following statements is FALSE?
A) The untreated sewage is a health hazard. B) The untreated sewage increases the BOD. C) The untreated sewage decreases the dissolved oxygen. D) The untreated sewage kills bacteria. E) All of the statements are true.