Sample questions for exam I.
1. Which statement concerning the hormonal regulation of the ovarian and uterine cycles is FALSE?
A. Follicle stimulating hormone acts primarily on the oocyte.
B. Lutenizing hormone is required for completion of the first meiotic division.
C. Releasing hormones are made by neurons in the hypothalamus of the brain.
D. The pituitary gland produces follicle stimulating hormone and lutenizing hormone.
2. The cells formed during the process of cleavage are known as
A. somatomeres.
B. discomeres.
C. ectomeres.
D. blastomeres.
Two Questions which will be on the February 17th BioS 325 Exam I. Find the answers to the two questions below. Please don't give the answers to others since they will be worth 8% of the exam grade! These questions will be printed as questions 1 and 2, exactly as they are here, so remember the correct answer. Do not bring any written answers to the exam.
The answer to the first question can be found by going to the Virtual Embryo website from the BioS 325 homepage and looking for information on sperm capacitation in the Developmental Biology Tutorial. The site can also be directly accessed at the following URL: http://www.acs.ucalgary.ca/~browder/
1. Which of the following statements concerning sperm capacitation is FALSE?
A. To become competent to fertilize eggs, human sperm require changes (called capacitation), which occur in the female reproductive system.
B. The process of capacitation enables the sperm to undergo the acrosome reaction and hyperactivation.
C. Recent Research on capacitation by Visconti, et al. found that calcium, sodium bicarbonate and bovine serum albumin were necessary for sperm capacitation in vitro.
D. The protein ZP-3 is a required to initiate the capacitation process.
The answer to the following question can be found by going to Scott Gilbert's website "Zygote" from the BioS 325 homepage, or directly with this URL (http://zygote.swarthmore.edu/index.html). Look in the chapter on Sex Determination.
2. Hermaphrodites have many advantages such as: all individuals can bear young, one individual can colonize a new habitat, little time and energy is spent on courtship and there is no mating competition. So why are there males (and sexual reproduction)? Which of the following statements is FALSE?
A. Species must change or become extinct as proposed in the "Red Queen" hypothesis and males provide new combinations of genes which fuel those changes.
B. Males are necessary because in most sexually reproducing species, males are more flamboyant and colorful (eg. the peacocks tail).
C. Sexual reproduction allows for the accumulation of favorable combinations of genes.
D. Sexual reproduction produces more genetic variation which allows individuals to respond better to a changing environment.
Two Questions which will be on the March 30th BioS 325 exam
The answer to the first question can be found by going to the Virtual Embryo website from the BioS 325 homepage. The site can also be directly accessed at the following URL: http://www.ucalgary.ca/~browder/
Follow hypertext links from the Developmental Biology Journal Club to the Journal Club Forum and to minireviews on the Mammary Gland.
1. Which statement about stem cells of the mammary gland is False?
A. Medically, stem cells are important because they are the cells likely to develop into cancer of the breast.
B. Small light cells in the mammary epithelium usually contact the lumen.
C. Some large light cells have well developed secretory organelles and milk products at their apical surfaces.
D. Pale staining cells are the putative stem cells.
The answer to the second question can be found in the Heart Development Tutorial from Loyola University Medical School. The site can be accessed from the BioS 325 homepage or directly at the following URL: http://www.meddean.luc.edu/lumen/MedEd/GrossAnatomy/thorax0/heartdev/main_fra.html
2. Which statement about the development of the atrioventricular (A-V) canal is False?
A. Initially in heart development, there is no direct flow from the atria to the right ventrical.
B. The A-V canal must shift to establish direct blood flow to the right ventricle from the atria.
C. When the A-V canal first forms it is shaped like a "dogs bone".
D. When the superior and inferior A-V endocardial cushions fuse a single A-V valve is finally formed.
Two Questions which will be on the May 4th BioS 325 exam
The answer to the first question can be found under Molecular Genetics in the Medical Speciality Menu of the Oncolink site at the University of Pennsylvania. The site can be accessed from the BioS 325 homepage or directly at the following URL: http://oncolink.upenn.edu/
1. Which of the following statements about apoptosis is False?
A. It is a genetically mediated, programmed, form of cell death associated with organogenesis.
B. In the "conflict model" of Myc action it is proposed that, like an oncogene, Myc promotes cell division when mitogens are present, but if mitogens are absent it promotes apoptosis.
C.In cells whose DNA has been damaged, the levels of the tumor suppressor p53 decrease resulting in the stimulation of cell division.
D. Rb is a tumor suppressor that inhibits cell division and promotes terminal differentiation of lens cells.
The answer to the second question can be found by going to the Zygote website from the BioS 325 homepage. The site can also be directly accessed at the following URL: http://zygote.swarthmore.edu/index.html
Follow hypertext links from the Informative Node to Cytoplasmic Determinants and look for information on pole plasm.
2. In the midge, Wachitella persicariae, which statement about the germ plasm is False?
A. Nuclei which move into the posterior pole (germ) plasm of the egg will form functional gametes.
B. Most nuclei lose 32 out of the original 40 chromosomes, but nuclei in the pole plasm do not lose chromosomes.
C. Nuclei which are prevented from entering the pole cytoplam lose chromosomes and will not form functional gametes.
D. Nuclei which lose chromosomes but are allowed to enter the pole cytoplam will form functional gametes.