Four of the five actions listed below are responses of
the body to heat. Select the exception.
a. increased sweating
b. increased retention of blood in the core region
c. decreased rate of muscle activity
d. increased water loss
e. dilation of peripheral blood vessels
Answer: b
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A researcher has a petri dish containing several species of bacteria, but no viruses. She notices that the population of E. coli in her petri dish has no antibiotic resistance
Two weeks later, she reassesses the bacteria and finds that the E. coli have acquired antibiotic resistance. How could this have happened? A. E. coli acquired the genes conveying antibiotic by conjugation with other bacterial cells. B. E. coli acquired the genes conveying antibiotic by transformation. C. Spontaneous mutations conveying antibiotic-resistance arose in the E. coli population of the petri dish. D. All of these answer options are correct.
If a codon in the mRNA is 5’-ACG-3’, then the anticodon of the proper tRNA will be ____
a. 5’-UGC-3’ b. 5’-CGU-3’ c. 5’-CGT-3’ d. 5’-TGC-3’ e. 5’-GCA-3’
The adrenal medulla produces
a. mineralocorticoids. b. epinephrine. c. cortisol. d. testosterone. e. glucocorticoids
Your roommate is experiencing heartburn and asks you to purchase her an antacid. Chemically speaking, how do you know that the antacid will help eliminate her pain?
A) It has a low pH to balance the acidity in her digestive tract. B) It is a buffer and will prevent the pH in her digestive tract from changing. C) It is probably high in H+. D) It has a higher OH- concentration to increase the pH in her digestive tract.