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Biology 30 · Worksheets

Cumulative review 2

Ten questions of mixed difficulty, covering Genetics, Nervous and endocrine, Populations, Reproduction, the senses. Print it, or work through it on screen — the answer key starts on its own page.

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Cumulative review 2

Biology 30 · maddyhelps.com

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  1. A J-shaped growth curve shows:

    1. a) logistic growth
    2. b) a population crash
    3. c) a stable population
    4. d) exponential growth

  2. How does a vasectomy prevent pregnancy?

    1. a) Sperm are made unable to swim
    2. b) The vas deferens is cut or blocked, so sperm cannot leave the body
    3. c) The oviducts are tied
    4. d) The testes stop producing testosterone

  3. Non-disjunction during meiosis I produces gametes that:

    1. a) are always identical to the parent cell
    2. b) contain no genetic material at all
    3. c) have an abnormal number of chromosomes
    4. d) have the correct number of chromosomes but the wrong alleles

  4. What does DNA stand for?

    1. a) deoxyribonucleic acid
    2. b) diribonucleic acid
    3. c) dinucleic acid
    4. d) deoxyribose nucleotide analogue

  5. A father with blood type A (IAi) and a mother with blood type B (IBi) have a child. Which blood types are possible?

    1. a) AB only
    2. b) A and B only
    3. c) O only
    4. d) A, B, AB and O

  6. How does the combined birth control pill prevent ovulation?

    1. a) It raises LH so high that ovulation cannot happen
    2. b) It blocks the oviducts
    3. c) Its estrogen and progesterone inhibit FSH and LH release through negative feedback
    4. d) It destroys eggs in the ovary

  7. During which stage do homologous chromosomes separate from each other?

    1. a) anaphase of mitosis
    2. b) anaphase II of meiosis
    3. c) anaphase I of meiosis
    4. d) telophase I of meiosis

  8. What are the three small bones of the middle ear?

    1. a) atlas, axis and stapes
    2. b) malleus, incus and stapes
    3. c) tympanum, pinna and cochlea
    4. d) cochlea, vestibule and canals

  9. Why does a myelin sheath make an impulse travel faster?

    1. a) The impulse jumps from one node of Ranvier to the next
    2. b) Myelin produces extra neurotransmitter
    3. c) Myelin makes the axon shorter
    4. d) Myelin stores sodium ions for the impulse

  10. Ovulation is triggered by a sudden surge of which hormone?

    1. a) progesterone
    2. b) LH (luteinizing hormone)
    3. c) oxytocin
    4. d) FSH

Answer key · Cumulative review 2

Biology 30 · maddyhelps.com

  1. d) exponential growth — A J-curve keeps getting steeper because growth is unlimited. An S-curve (logistic) levels off at carrying capacity.
  2. b) The vas deferens is cut or blocked, so sperm cannot leave the body — Cutting the vas deferens stops sperm leaving the testes. Hormone levels are unaffected. Tying the oviducts is the female procedure, tubal ligation.
  3. c) have an abnormal number of chromosomes — Non-disjunction means a homologous pair fails to separate, so one gamete gains a chromosome and another loses one. Trisomy 21 arises this way.
  4. a) deoxyribonucleic acid — Deoxyribonucleic acid — named for its sugar, deoxyribose, which is ribose minus one oxygen. RNA keeps that oxygen.
  5. d) A, B, AB and O — Each parent can pass IA, IB or i, giving IAIB (AB), IAi (A), IBi (B) and ii (O) — all four types, each with probability 1/4.
  6. c) Its estrogen and progesterone inhibit FSH and LH release through negative feedback — The pill's hormones mimic high natural levels, so the hypothalamus and pituitary hold back FSH and LH. No FSH means no follicle; no LH surge means no ovulation.
  7. c) anaphase I of meiosis — Anaphase I pulls whole homologous pairs apart, which is what halves the chromosome number. Sister chromatids separate later, in anaphase II.
  8. b) malleus, incus and stapes — The malleus (hammer), incus (anvil) and stapes (stirrup) pass vibrations from the eardrum to the oval window, amplifying them along the way.
  9. a) The impulse jumps from one node of Ranvier to the next — Myelin insulates the axon, so the action potential only happens at the gaps — the nodes of Ranvier. Jumping between them is called saltatory conduction.
  10. b) LH (luteinizing hormone) — A spike in LH from the pituitary, around day 14, makes the mature follicle release its egg. FSH's main job is earlier: growing the follicle.