What is the first step during transcription initiation in prokaryotes?
A. RNA polymerase binds to the promoter.
B. The transcription bubble is formed.
C. Transcription factors bind to the TATA box sequence.
D. The DNA double helix is unwound.
E. RNA polymerase synthesizes a short primer.
Answer: A
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In the lungs, which of the following would be classified as elastic work?
a. air flow resistance b. viscous resistance c. alveoli expansion d. intercostal contraction
The process in which an environmental stimulus triggers a response that compensates for changes in
the internal/external environment is called
a. positive feedback. b. physiological feedback. c. reflex feedback. d. negative feedback. e. anatomical feedback.
The graphs below show the frequency of the b+ allele over twenty generations in two populations of heterozygous
flour beetles (data for a population of ten individuals is shown in graph A; data for a population of one hundred individuals is shown in graph B). Why does the frequency of the b+ allele increase in both populations?
a. b+ is a lethal allele b. b+ is a balanced polymorphism c. b+ is a fixed allele d. the b+ allele is adaptive e. b+ is a neutral mutation
Which of the following increases the reabsorption of water by inserting aquaporins into the membranes of the distal tubule and collecting duct cells?
A) Erythropoietin B) Aldosterone C) Angiotensin D) ADH E) Renin