True or False: Prior to research performed by Pasteur, the production of alcohol was thought to be a purely chemical process and not catalyzed by microorganisms
a. TRUE
b. FALSE
Answer: A
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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.
Which of the following does not contribute to the maintenance of homeostasis in mammals?
a. sweat glands b. the digestive system c. lungs d. specialized gill cells e. the kidneys
Cartilage that forms at the end of long bones and functions to allow bones to slide past each other during movement is called ________
A) elastic B) hyaline C) bone D) fibrocartilage
Fire and Mello studied the effect of RNAs made from plasmids on gene expression in the nematode C. elegans. The results from the two experimental treatments and the control are shown below. What can be concluded from these results?
A. The labeled probe detects RNAs other than mex-3. B. Double-stranded RNA degrades more mex-3 mRNA than antisense RNA. C. The injection procedure results in degradation of all mex-3 mRNA. D. Antisense RNA degrades more mex-3 mRNA than double-stranded RNA.