The key hormone of childbirth is ____ , which is released from the posterior pituitary gland. It stimulates uterine contractions, which, in turn, stimulate more of it to be released
Fill in the blank with the appropriate word.
oxytocin
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Instantaneous speciation (select all correct choices)
A. is, by definition, a type of sympatric speciation. B. is typically caused when hybridization between species produces fertile, viable offspring that are reproductively isolated from both parental species. C. often involves the multiplication of chromosome sets, or polyploidy. D. is relatively common in plants but not in animals. E. none of these
Which of the following is TRUE of a chemical reaction?
A. It requires no energy. B. It rarely occurs with a catalyst present. C. It changes a substance from one form to another. D. It is limited to only a few types of organisms. E. They are usually irreversible.
Three mRNA nucleotides code for one amino acid.
a. Polymerization area b. Promotion region c. Translation bubble d. Transcription bubble
Spermatogenesis is governed by _____.
A. GnRH B. luteinizing hormone only C. luteinizing hormone and follicle-stimulating hormone D. Follicle-stimulating hormone only E. GnRH, luteinizing hormone, and Sertoli cells