If relaxed circular DNA is designated (R), supercoiled circular DNA is designated (S), and linear DNA is designated (L), arrange these conformations in order of increasing rate of sedimentation during centrifugation
A) (R), (S), (L) B) (L), (S), (R) C) (S), (R), (L) D) (L), (R), (S) E) (S), (L), (R)
Answer: D
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Which of the following is an example of gene regulation at the posttranslational level?
A. Initiation of protein synthesis B. Alteration of protein structure C. Prevention of RNA synthesis D. Early termination of an mRNA transcript
Osmosis in capillary exchange takes place in
response to
a. high oxygen concentrations. b. low oxygen concentrations. c. high plasma protein concentrations. d. low plasma protein concentrations. e. high carbon dioxide concentrations.
A root cap:a
protects the fragile meristematic cells at the root tip. b. pushes the root tip deeper into the soil. c. protects the cells located in the lateral meristem. d. arises from the stem apical meristem. e. will differentiate into primary tissues of the adult plant.
Allopatric speciation is compatible with both the gradualistic and punctuated equilibrium models of evolution.
a. true b. false