Which ancient habitat has allowed the formation of the most abundant fossils?
A. Eroding hillsides
B. Deserts
C. Polar ice caps
D. Rivers and shallow seas
E. Rocky plateau
Answer: D
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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.
A microbiologist obtained two pure isolated biological samples: one of a virus, and one of a viroid. The labels came off during a move from one lab to the next, however
The scientist felt she could distinguish between the two samples by analyzing for the presence of a single type of molecule. What type of molecule would she be looking for to differentiate between the two? A. DNA B. Protein C. Lipids D. RNA
How are B-cell receptors different from T-cell receptors?
a. B-cell receptors bind antigen, while T-cell receptors do not. b. B-cell receptors have a more complex structure. c. B-cell receptors have a more simple structure. d. B-cell receptors are bound to the cell membrane, while T-cell receptors are bound to the nuclear membrane. e. B-cell receptors stimulate the production of a clone of cells.
How is it possible for an enzyme to lower the required energy of activation for a reaction? What will be an ideal response?