ISC Chapter 25

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ISC Chapter 25
2011-11-22 20:13:44
ISC Chapter 25

ISC Chapter 25
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  1. In which of these is a structure called an ovarypresent?
    D. all of these
  2. Important in the process of natural selection, ________creates a unique combination of genes, some of which may allow a new offspring to better survive in a changing environment
    A. sexual reproduction
  3. Members of Homo sapiens differ from other mammals (although perhaps not from other hominins) in this aspect of sexuality:
    D. A and C
  4. The number of Down Syndrome births (per 1000) for amother of age 37 ________ by the time a prospective mother reaches age 47
    C. doubles
  5. Police investigators analyze blood left at a crime scene without a body present. The investigators can eliminatea certain half of the population of all people as the potential victim if they look for ________ in the blood samples.
    C. Barr bodies
  6. The hormone testosterone affects which of these?
    A. the entire body
  7. Common to both males and females during puberty is a sequence of hormonal and glandular events. Which of these is found only in females?
    C. eestrogen
  8. What do the testes contribute to seminal fluid?
    B. sperm cells
  9. Human sperm, certain prokaryotes and protists all share:
    B. a flagellum
  10. Where has knowledge from subatomic physics and the decay rates of isotopes been of value in modern medicine?
    B. cancer therapy
  11. If you are a female, how old are your egg cells?
    C. as old as you are
  12. The culturally-influenced wearing of tight-fitting pants has been tied to human
    A. male infertility
  13. Prevention of pregnancy by continuing to nurse is
    B. a myth
  14. Hormonal regulation of ovulation is
    A. an effective means of birth-control
  15. Which of these is a causal agent of STDs?
    D. all are
  16. The most commonly reported STD
    B. chlamydia
  17. The formation of a new individual by the union of twosex cells:
    B. sexual reproduction
  18. Zygotes contain ________ of chromosomes
    B. two sets
  19. In order that each gamete have on set of chromosomes, this process occurs to create the haploid gametes:
    D. meiosis
  20. How many chromosomes exist in the average adult human?
    D. 46
  21. How many chromosomes are involved in the determination of the sex of an individual?
    C. 2
  22. Which chromosome is primarily concerned with determining male sexual differentiation?
    A. Y
  23. During fetal development, the differentiation of cellsinto gonads happens at about week number ________.
    B. 5
  24. Puberty is generally reached by ________ before________.
    B. girls; boys
  25. The lining of the uterus is maintained by the hormone:
    B. progesterone
  26. The final structure through which sperm must pass before exiting the penis:
    C. urethra
  27. This gland is a contributor to semen but later in life can cause cancer in some 75% of men over 65 years of age:
    D. prostate
  28. When are oocytes formed?
    A. before birth
  29. The same hormones that prepare the uterus to receive the embryo
    A. prepare the breasts for milk production
  30. The use of fertility drugs or other techniques often results in this side-effect which may or may not be desired by the expectant parents:
    B. the birth of twins, triplets or more children
  31. One sperm out of millions fertilizes an egg; the remainder
    D. produce enzymes that digest the mucus barrierbetween the egg and the successful sperm
  32. The nutritional needs of the human embryo are met through the:
    A. placenta
  33. Which of these can cross the placental barrier and into the developing embryo?
    D. all of these
  34. About what percentage of births in the United States occur by cesarean section?
    C. 20
  35. Preparation of the mother's body for labor is accomplished by the release of a hormone called:
    D. oxytocin
  36. Contraceptive methods have been employed by human societies since at least the time of:
    A. ancient Egypt