The cells marked in the photomicrograph (A) contain the enzyme 'aromatase' (B) contain the enzymes 'P450scc' and '5-alpha-reductase' (C) demonstrate receptors for follicle-stimulating hormone (D) A and B (E) B and C
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The cells marked in the photomicrograph
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- 11) Postpartum estrus (PPE) is the period of receptivity immediately following parturition (giving birth). Select all that apply a) It occurs because the drop in progesterone levels resulting from the regression of the CL release DA from inhibition. b) A mouse can be pregnant and nursing a litter at the same time. If she is, the P4 coming from the CL of her pregnancy will prevent her from cycling from PPE to parturition. c) If a mouse mates with a sterile male during PPE, the resulting CL will still be maintained by the PRL released in response to suckling so she will not cycle from PPE to parturition. d) A mouse that breeds during PPE and continues to nurse the first litter may have a longer than normal gestation due to embryonic diapause. e) A mouse that breeds during PPE and continues to nurse the first litter may have a smaller than normal litter due to embryonic diapause.11.)Which hormone promotes the thickening of the endometrium and also inhibits the hormone that promotes the development of the follicle wall into the corpus luteum? a.) Progesterone b.) Luteinizing hormone (LH) c.) Estrogen d.) Follicle stimulating hormones (FSH) 12.) If gonadotropin releasing hormone (GnRH) production were blocked, the following would occur, except : a.) LH levels would decrease b.) Sperm production would decrease c.) Testosterone production would decrease d.) FSH level would increase 13.) Which of the following is not a hormone? a.) Estrogen b.) Testis c.) Testosterone d.) Gonodotropin releasing hormone 14.)Which hormone is inhibited during pregnancy in order to prevent contractions of the uterus? a.) Estrogen b.) Progesterone c.) Oxytocin d.) Follicle stimulating hormones (FSH) 15.)Which of the following glands controls the function of the ovaries? a.) Parathyroid b.) Thymus c.) Thyroid d.) Pituitary GlandFor this exercise, an electron micrograph of secretory cells of the anterior pituitary is being used (Sandborn, E.B. (1970) Cells and Tissues by Light and Electron Microscopy, New York, New York: Academic Press, Inc.). The image originally measured 18.7 cm wide and 18.5 cm high with a magnification of 5200x. Given the width of the original micrograph at 18.7cm, what is the true width of unmagnified image? Show calculations.
- 1.) List five male sex hormones and explain what they do in males? 2.) In young men, the growth of facial hair begins at the same time as blood testosterone levels start to increase. From this evidence, can you conclude that testosterone causes facial hair growth? Justify your answer.(d) State whether the following statements are True or False. If False rewrite the correct form of the statement by only changing the last word of the statement. (i) The alpha cells dfthe pancreas secrete insulin. (ii) Duplicated chromosomes remain attached at a point termed centrosome. (iii) The number of pairs ofautosomes in man is 22. (iv) Penicillin obtained from si fungus is an example of an antibody. (v) Plants that manuíacture their own food are termed heterotropłis.In vertebrate animals, spermatogenesis and oogenesis differ, in that 1.) Cytokinesis is unequal in oogenesis whereas it i equal in spermatogenesis 2.) spermatogenesis is not completed until after fertilization occurs, but oogenesis is completed by the time a girl is born 3.) Oogenesis produces four haploid cells, whereas spermatogenesis produces only one functional spermatozoon 4.) Oogensis ends at menopause. Whereas spermatogenesis is finished before birth 5.) Oogensis begins at the onset of sexual maturity whereas spermatogenesis happens in embryonic development
- Nerve growth factor binds to which type of receptor? a.) Receptor tyrosine phosphatases b.) Receptor Serine/Threonine Kinase c.) Receptor guanylyl cyclase d.) Receptor tyrosine kinaseDouble fertilization means that(A) flowers must be pollinated twice to yield fruits and seeds.(B) every egg must receive two sperm to produce an embryo.(C) one sperm is needed to fertilize the egg, and a second spermis needed to fertilize the polar nuclei.(D) every sperm has two nucleiThe vessels marked in the diagram below, (A) function to decrease the temperature of blood flowing into the testis (B) are derived from the testicular vein (C) carries blood with a higher level of testosterone than LH or FSH (D) A and B (E) B and C (F) all of the above
- The most notable differences between gamete formation in most animals and gamete formation in plants is that ______________. a) plants produce gametes in somatic tissue, whereas animals produce gametes in germ tissue b) plants produce gametes by mitosis, whereas animals produce gametes by meiosis c) plants produce only one of each gamete, but animals produce many gametes d) plants produce gametes that are diploid, but animals produce gametes that are haploidThe assumptions built into this Turing model predict that morphogen activators and inhibitors should be present in the distal limb mesenchyme at the time of chondrogenesis. But what morphogens? The search was on. How might you identify the activators and inhibitors of this system?em 92 of 145 Z 92. During an experiment, a researcher inactivates the fibroblast growth factor receptor gene expressed on grandiosa celih Which of the folog A) Absence of androgen production B) Formation of tumors from thecal cells C) Inhibition of formation of the follicular antrum D) Premature ovulation E) Transformation of thecal cells into granulosa cells