Which of the following plant hormones is used to prolong the life of flower cuttings and stored vegetables?
A. auxins
B. IAA
C. cytokinins
D. ethylene
Answer: C
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Canine phosphofructokinase (PFK) deficiency afflicts Springer spaniels, affecting an estimated 10% of the breed. Given its critical role in glycolysis, one implication of the genetic defect resulting in PFK deficiency in dogs is _____
A) early embryonic mortality B) elevated blood-glucose levels in the dog's blood C) an intolerance for exercise D) a reduced life span
Defects in cell signaling can lead to a cancerous cell due to:
A. overproduction of signals that trigger cell division. B. overproduction of a receptor that triggers cell division. C. a defective receptor that stays in the activated state and triggers cell division continuously. D. a defective signal-transduction protein that stays in the activated state and triggers cell division continuously. E. All of these choices are correct.
Glucose and fructose
a. can be ring forms. b. are structurally different. c. are monosaccharides. d. have the same atoms in the same ratio. e. all of these
The transfer of antibiotic-resistant genes from genetically engineered bacteria to disease-causing bacteria _____.
a. would, if it occurred, be no cause for concern b. has occurred c. is likely to occur d. can never occur e. seems unlikely