The polymerase chain reaction (PCR) is used as a tool for
A. rearranging the gene sequences in isolated fragments of DNA.
B. amplifying the amount of DNA to provide a large sample.
C. extracting DNA from nuclei.
D. fragmenting DNA into smaller pieces.
E. breaking down DNA for analysis.
Answer: B
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What happens at time “C” of the action potential?
a. sodium-potassium pumps are active b. potassium gates close and sodium gates open c. sodium gates close and potassium gates open d. positive feedback begins e. both potassium gates and sodium gates close
During signal transduction of a G protein, the first messenger binds to the receptor, and the G protein is activated
What happens next? a. formation of cAMP b. cellular response c. activation of protein kinase d. activation of adenylyl cyclase e. phosphorylation of the G protein
Which of the following is/are TRUE regarding Leptin?
a. Leptin is a steroid hormone, and Leptin receptors are expressed in arcuate nuclei b. Leptin is secreted by adipocytes, and Leptin receptors are expressed in arcuate nuclei c. Leptin is released by the pituitary, and Leptin receptors are expressed in paraventricular nucleus d. Leptin is secreted by adipocytes, and Leptin receptors are expressed in pituitary
The three major side effects of antimicrobials are toxicity to organs, allergic reactions, and suppression or alteration of blood cells.
a. true b. false