The production of root hairs is mostly dependent on which of the following influences?
A. auxin production
B. position of an epidermal cell
C. width of the root
D. length of the root
E. position of the root in the soil
B. position of an epidermal cell
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What is the name of the enzyme that adds CCA to the 3' end of tRNAs?
A. tRNA nucleotidyltransferase B. Aminoacyl-tRNA synthetase C. RNA polymerase D. Peptidyl transferase
What breathing abnormalities can occur in neonatal mammals exposed to nicotine?
a. reduced ventilator output. b. increased duration of apneas. c. SIDS. d. reduced ventilator output and increased duration of apneas. e. reduced ventilator output, increased duration of apneas and SIDS.
A metabolic pathway must provide the desired chemical (metabolite) at the rate required for cellular and tissue function. To accomplish this, the reaction sequence ________.
a) includes only reactions are essentially irreversible b) includes only chemical reactions that are energetically favorable under the conditions for which synthesis is required c) all of the choices are correct d) "couples" energetically unfavorable reactions to ATP hydrolysis in order to drive the reaction toward the required product
Certain mutations in the regulator gene of the lac system in E. coli result in maximal synthesis of the lac proteins (?-galactosidase, etc.) even in the absence of the inducer (lactose). Provide an explanation for this observation
What will be an ideal response?