Wasserman_BILD2_MT2_Key

Wasserman_BILD2_MT2_Key - BILD 2 Feb. 27, 2007 Midterm II...

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Unformatted text preview: BILD 2 Feb. 27, 2007 Midterm II Name ____________________________________ 1. (100 pts) Provide a 2-3 sentence answer to each of these Lecture Objective Questions: GRADER: Kevin Shah A. Discuss how and why different target cells exposed to the same hormone may respond in different ways. 25 pts: The same hormone can affect target cells differently if the cells have either different receptors for the same hormone or different signaling pathways for the same receptor. Points Taken Off For: -Steroid and peptide hormone comparisons (involves different hormones) B. Define parthenogenesis and describe an example. 25 pts: Parthenogenesis is a reproductive strategy in which an organism develops from an unfertilized egg. An example of this is the male honeybee, where the males formed by parthenogenesis are haploid. If a bee egg is fertilized, it develops into a diploid female. Points Also Given For: -Other Examples: komodo dragon, bees, wasps, ants, amphibians, fish, lizards -Mostly haploid offspring, but can also be diploid. Points Taken Off For: -Describing hermaphroditism -Not including unfertilized eggs C. Explain the significance of the cloning experiment that produced Dolly with regard to changes in DNA during development. 25 pts: The cloning of Dolly showed that DNA does not undergo any irreversible changes during development. Points Also Given For: -No DNA information is thrown out. -No changes found in the genome Points Taken Off For: -DNA is irreversible D. Explain the role of the sodium-potassium pump in maintaining the resting potential. 25 pts: The Na-K pump maintains the resting potential by actively pumping out sodium ions and pumping potassium ions into the cell. This creates an ion concentration gradient which generates a negative resting potential. Points Taken Off For: -Not mentioning pumping or ATPase or active transport -Reversing Na and K directionality -Explaining the Action Potential instead of resting potential BILD 2 Feb. 27, 2007 Midterm II Name ____________________________________ 2. Word List Questions (100 pts). In a brief but informative fashion, describe the location and functions of the following: GRADER: Michelle Rullan A. Bowman's capsule 25 pts Bowmans capsule: is at the beginning of the nephron in the kidney . It surrounds the glomerulus and functions as the site of filtration of the blood into filtrate. B. posterior pituitary 25 pts Posterior Pituitary: is located below the hypothalamus/ in region of the brain . It stores and releases 2 hormones: ADH and oxytocin (Must mention 1 of the 2 for full credit). C. corpus luteum 25 pts Corpus Luteum: is located in the ovary after ovulation has occurred. It secretes estrogen and progesterone which promote thickening of the endometrium (uterine lining) and act as negative feedback to hypothalamus and anterior pituitary to stop release of FSH and LH....
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Wasserman_BILD2_MT2_Key - BILD 2 Feb. 27, 2007 Midterm II...

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