Which membrane reduces friction between the lungs and chest wall during breathing?
a. serous
b. cutaneous
c. mucous
d. synovial
e. tissue
ANSWER: a
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A teratogen is a drug that:a
increases fertility. b. prevents fertilization. c. prevents implantation of the embryo in the endometrium. d. induces labor. e. interferes with morphogenesis.
You are studying the effects of specific transcription factors on the activation of gene expression. You notice that one particular transcription factor binds far away from the promoter of its target gene. What can explain this?
A. DNA looping brings the transcription factor closer to the promoter and initiates gene transcription. B. The transcription factor transcribes small RNAs that then bind to the promoter and activate the gene's expression. C. The transcription factor tags the enhancer with ubiquitin to stimulate transcription. D. RNA looping brings the transcription factor closer to the promoter and initiates gene transcription.
The two photosystems of light-dependent reactions are designated ____.
A. type 1 and type 2 B. type I and type II C. photosystem A and photosystem B D. photosystem 680 and photosystem 700 E. photosystem I and photosystem II
Human growth hormone (HGH) is a peptide hormone that stimulates growth, cell division and regeneration. HGH is made in the anterior pituitary gland. A researcher wants to introduce the gene encoding human growth hormone into E. coli so she can produce large quantities of the peptide hormone for medical treatments. What strategy should the researcher take?
A. Obtain an HGH gene from another prokaryote. B. Obtain the HGH gene from a human anterior pituitary gland cDNA library. C. Obtain an HGH gene from either a genomic or cDNA library. D. Obtain the HGH gene from a human genomic library produced from DNA from any human tissue. E. Obtain the HGH gene from a human genomic library produced from DNA of the anterior pituitary gland.