Can signaling via a steroid hormone receptor lead to amplification of the original signal? If so, how?
What will be an ideal response?
Because the interactions of the signal molecule with its receptor and of the activated receptor with its gene are both one-to-one, there is no amplification in this part of the signaling pathway. The signal can, however, be amplified when the target genes are transcribed, because each activated gene produces multiple copies of mRNA, each of which is used to make multiple copies of the protein that the gene encodes.
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A codon is composed of how many bases?
A. one B. two C. three D. four E. 64
All mammals develop a placenta, which provides for exchange of nutrients and wastes
between mother and offspring.
a. True, by definition, mammals have placentas. b. False, some mammals produce eggs. c. True, all mammals have amniotic eggs. d. False, not all mammals nurture their young
Chromatin condenses into chromosomes and the mitotic spindle begins to form during ____
a. interphase b. prophase c. metaphase d. anaphase e. telophase
Which of the following describes the Skene's gland?
A. It is located on the clitoral hood. B. It has no known function. C. Its ducts empty into the urethra. D. It secretes fluid for all women.