Which of the following statements are likely to occur when a drug blocks beta-adrenergic receptors on the heart? (Select all that apply.)
a. Decrease heart rate
b. Increase calcium levels in heart cells
c. Decrease heart contractility
d. Increase cAMP
Answer:
a. Decrease heart rate
c. Decrease heart contractility
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Which of the following statements concerning animal taxonomy is (are) true?
1. Animals are more closely related to plants than to fungi. 2. All animal clades based on body plan have been found to be incorrect. 3. Kingdom Animalia is monophyletic. 4. Animals only reproduce sexually. 5. Animals are thought to have evolved from flagellated protists similar to modern choanoflagellates. A) 5 only B) 1 and 2 C) 3 and 5 D) 3, 4, and 5 E) 2 and 4
The centromeres of sister chromatids uncouple and the chromatids separate in what meiotic phase?
A. prophase I B. metaphase II C. anaphase I D. telophase II E. anaphase II
You have designed a drug able to transform skin cells into cells that secrete insulin. What accumulative aspect of the cell will the drug affect?
A. Phenotypic traits. B. Epigenetics. C. The proteome. D. Transcriptional factors.
Reverse-transcriptase PCR ____
a. uses Taq polymerase to produce cDNA copies of RNA transcripts b. uses RNA polymerase to amplify cDNA copies of RNA transcripts c. uses RNA polymerase to produce mRNA copies of a gene d. amplifies cDNA copies of RNA transcripts e. uses reverse transcriptase to produce mRNA copies of a gene