Explain how hormone secretion regulates the menstrual phase of the menstrual cycle. What will be an ideal response?
Concepts to Consider: During the five days of the menstrual phase, GnRH is released from the
hypothalamus. This stimulates the pituitary to release FSH and LH. FSH stimulates follicle
development in the ovary. FSH also stimulates gene transcription for the enzyme aromatase, which is
important in the synthesis of estrogens.
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You are reviewing population pyramids of different countries for an exam. The pyramid of a particular country has a very high number of individuals in the post reproductive category (ages 40 and up) and very few individuals in the group below the age of 20. In which category would you put the country?
1.Declining. 2.Stable. 3.Increasing. 4.There is not enough information to determine the appropriate category.
Signal molecules that determine relative positions during development are known as
A. morphogens. B. organizers. C. inductors. D. cadherin domains. E. derepressers.
Why is it necessary for many sperm to be present in order for one to fertilize the egg?
A) A mass of sperm is necessary to open the uterine tube. B) The combined enzymes digest a path through the corona radiata and zona pellucida. C) The combined motion of their flagella enables one sperm to push its way into the egg. D) A mass of sperm is necessary to gain entry into the ovary. E) A sperm cannot find the egg by itself.
UV irradiation inactivates Cryptosporidium because _______.
A. it leads to a blocking of the action of DNA polymerase and RNA polymerase B. it blocks the action of lysozyme C. it denatures the proteins within the microorganism D. it removes thymine dimers within the DNA