LectureQuiz1_A_Answers.docx

Name______________________________________________ Test Form ______A_____ ANSCI 224 Reproduction and Growth April 11, 2012 Extra Credit Pop Quiz Please 1) write your name on the front of this exam, 2) write your name, Net ID and Test Form on the scantron. Read the question carefully and fill in completely the circle near the letter corresponding to the best answer on the Scantron sheet. There are 10 questions and 10 possible points in this quiz. It is for extra credit only. Although they are both endocrine glands, the anterior and posterior pituitary function very differently. This difference is partly because: The anterior pituitary develops from the roof of the mouth and the posterior pituitary develops from an outpocketing of the developing eye. The anterior pituitary develops from the roof of the mouth and the posterior pituitary develops from the brain. The anterior pituitary has nerve endings from the hypothalamus and the posterior pituitary receives hormones from the hypothalamus. The anterior pituitary forms and develops much earlier than the posterior pituitary. If the Sry gene is translocated to a mammal that has XX sex chromosomes, what will happen? Ovaries will develop in this mammal Nothing will happen because Sry cannot function normally without a Y chromosome Testosterone production will be low and the mammal will appear feminine Testes will develop in this mammal Estrogen production will be high and the mammal will appear feminine Mammals that are XY and have mutations in the androgen receptor than make them completely insensitive to androgens: have testes but appear female externally lack testes and appear female have ovaries and appear female Dolphins have internal testes but still maintain a testicular temperature that is cooler than core body temperature by: Using cooled venous blood to cool the area around the testis By occasionally moving the testis outside of the body through the inguinal canal Using cooled venous blood to cool the arterial blood entering the testis By keeping the testes very close the the skin so they are cooled by the cool water as dolphins swim As sperm move from the efferent ducts to the cauda epididymis, they become: more dilute motile in these ducts larger in size more concentrated Although the PSA test is used very frequently, there is some controversy surrounding it use because It has a high false positive rate It has a high false negative rate It is a very invasive test, requiring a biopsy It often does not detect a cancer If supplemental testosterone were administered to males, how would this affect GnRH pulses and secretion? They would be increased They would be decreased They would not change If supplemental LH were administered to males, how would this affect testosterone secretion? It would be increased It would be decreased It would not change In males, FSH concentration is regulated primarily by? The concentration of LH The concentration of activin The concentration of inhibin The concentration of glucose Protein hormones are water soluble. How do they activate a response in target cells? Protein hormones pass through the cell?s plasma membrane, bind to receptors in the nucleus and activate transcription of new genes. Protein hormones bind to specific receptors on the cell?s plasma membrane that, in turn, activate a series of protein modifications and eventually transcription of new genes. Protein hormones bind to specific receptors on the cell?s plasma membrane that carry the hormone inside the cell. Protein hormones bind to specific cell membrane receptors that are transcription factors. In normal males, the paramesonephric or Mullerian duct will: form the epididymis form the testes regress form the vas deferens form the testes cords 1