An embryo having a blastodisc exhibits holoblastic cleavage
____________________ Indicate whether the statement is true or false.
F, meroblastic
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Many birth-control pills give a constant amount of synthetic estradiols and progesterone for 21 days, and followed by seven days where no hormones are ingested. These constant hormone levels affect the menstrual cycle in different ways
Which of the following statements most accurately describes the effects of birth control pills? A. Birth control pills inhibit the formation of uterine lining so implantation of a fertilized oocyte cannot occur. B. Birth control pills maintain constant levels of certain hormones so there is no surge in FSH and ovulation does not occur. C. The seven days with no hormones does not allow a thick enough uterine lining to form so a fertilized oocyte cannot implant. D. Birth control pills maintain constant levels of certain hormones and mask the release of the oocyte from the follicle.
What powers the ATP synthase enzyme in the light-dependent reactions of photosynthesis?
a. energy from ATP b. energy from NADPH c. energy from the splitting of water d. energy from electron transfer chains e. energy from the flow of hydrogen ions
When __________ reaches the stomach, it is inactivated by the low pH
a. pepsin b. pepsinogen c. trypsin d. amylase e. bile
Gametogenesis is the _______, fertlization is ________, and mating is _________.
Fill in the blank(s) with the appropriate word(s).