Exam 1 Questions | Animal Reproduction | ANSI 3443, Exams of Animal Biology

Download Exam 1 Questions | Animal Reproduction | ANSI 3443 and more Exams Animal Biology in PDF only on Docsity! 1 ANSI 3443 Exam 1 Wednesday, February 8, 2006 Name __________________________________ INSTRUCTIONS: 1. Read all instructions carefully. 2. Use only a No. 2 lead pencil to mark the machine-scored answer sheet. 3. DO NOT fold or bend the score sheet. Print your name (exactly as it appears on the test) and ID number on the answer sheet and fill in the dots for your first and last name. 4. Make sure you have all 8 pages of the exam before starting. 5. There are a total of 35 questions for the computer scored part of the exam. Omitted answers or those marked twice are considered WRONG. Note that the answers are arranged down the column on the score sheet in groups of ten. 6. Because interpretation of exam questions is a part of the exam itself, only questions relating to misprints, typographical errors, missing pages or other similar problems will be considered during the examination period. 7. When you are finished, turn in your answer sheet and your exam. 2 Questions 1 thru 15 are worth 2 points each. For each of the following multiple choice items, choose the single most appropriate answer. 1. Which of the following is considered a steroid hormone: A. Somatotropin B. Progesterone C. GnRH D. Insulin-like growth factor-I 2. The hypothalamo-hypophyseal portal vessel system: A. Is located between the thecal and granulosa cells. B. Carries hormones from the ovary to the hypothalamus. C. Is located between the cerebrum and cerebellum. D. Carries hypothalamic hormones to the anterior pituitary gland. 3. Which hormone, produced by both the cow and bull, stimulates the release of LH: A. Gonadotropin-releasing hormone B. Inhibin C. Relaxin D. Prostaglandin F2α 4. Masculinization of genitalia in most farm animals occurs by: A. Day 30 of pregnancy. B. Day 60 of pregnancy. C. Day 90 of pregnancy. D. Day 120 of pregnancy. 5. The anterior pituitary gland: A. Is an area of the brain that includes the cerebrum. B. Produces somatotropin. C. Stores and releases oxytocin. D. Is also called the hypothalamus. 6. The human placenta produces which of the following hormones: A. Prolactin B. eCG C. Placental lactogen D. Corticotropin-releasing hormone 5 20. A synthetic hormone that is considered to have estrogen-like activity include: A. Melengesterol acetate B. Diethylstilbesterol C. Both D. Neither 21. Clones can be generated by which of the following procedures: A. Bisection of embryos. B. Transplantation of a cell’s nucleus into an oocyte. C. Both D. Neither 22. A freemartin is an example of: A. A true hermaphrodite. B. A male pseudohermaphrodite. C. Both. D. Neither. 23. The Sry Gene: A. Can be used to sex embryos. B. Is a gene found only on the X chromosome. C. Both. D. Neither. 24. An undifferentiated gonad: A. Will form into a testis if the embryo is a genetic female. B. Will form into an ovary if the embryo is a genetic female. C. Both. D. Neither. 25. Factor(s) that would decrease the age at puberty in gilts include: A. Daily boar exposure starting at 4 months of age. B. A low/poor plane of nutrition. C. Both. D. Neither. Questions 26 thru 35 (worth 2 points each). Mark answer space (A) if the statement is true. Mark answer space (B) if the statement is false. 26. Phosphodiesterase is an enzyme that is stimulated by caffeine. A. True B. False 27. Average age at puberty in swine and cattle is about 6 months and 11 months, respectively. A. True B. False 6 28. On average, a 2-year old bull could handle about 40 cows during a 90-day pasture mating system. A. True B. False 29. Color intensity of a standard or milk sample in an enzyme-linked immunosorbent assay for progesterone increases as the concentration of progesterone in the standard or sample increases. A. True B. False 30. Inhibition of LH secretion by progesterone in the cow is considered an example of a negative feedback system. A. True B. False 31. The median eminence is an area of the hypothalamus that controls tonic LH release. A. True B. False 32. Norgestomet is a synthetic progestin. A. True B. False 33. Pregnancy rates of I.V.F. generated embryos matured to the blastocyst stage is about 50%. A. True B. False 34. A 21-hydroxylase deficiency during early embryonic development can cause female pseudohermaphroditism. A. True B. False 35. Prostaglandin F2α (PGF2α) causes vasodilation. A. True B. False 7 Questions 36 thru 43 are short answers. Your answers should be written as concisely as possible with correct spelling. 36. Define or describe (2 points each; 10 total points): A. Negative feedback loop: B. Enzyme-linked immunosorbent assay (ELISA): C. hormone: D. Aromatase: E. Sexual differentiation of the brain: 37. Describe a laboratory procedure that has been developed to sex embryos with over 95% accuracy (3 points): 38. Describe/explain the similarities and differences between GnRH and FSH; in your answer include something about t1/2 (4 points).