Select the correct sequence of events of the human menstrual phase, beginning and ending with the menstrual cycle.
A. menstrual phase ? proliferative phase ? secretory phase ? ovulation ? menstrual phase
B. menstrual phase ? secretory phase ? proliferative phase ? ovulation ? menstrual phase
C. menstrual phase ? proliferative phase ? ovulation ? secretory phase ? menstrual phase
D. menstrual phase ? ovulation ? secretory phase ? proliferative phase ? menstrual phase
Answer: C
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Chromosomes of a pair of homologous chromosomes
may differ from other chromosomes in terms of a. size. b. shape. c. the alleles they carry. d. the position of the centromere. e. all of these.
In the accompanying figure, the pair of organisms that have the most recent ancestor is:
a. 2 and 4. b. 6 and 4. c. 4 and 5. d. 2 and 3. e. 1 and 2
Trichomonas vaginalis is usually transmitted during sexual intercourse because it
A) requires a growth factor found only in the vagina. B) penetrates cells lining the genitourinary tract. C) participates with HIV in coinfections. D) produces cysts that germinate in the vagina. E) cannot live long outside the body.
The membrane that surrounds the central vacuole is the ____
a. chloroplast b. tonoplast c. chromoplast d. amyloplast e. ionoplast