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9th grade cells, genetics and evolution

9th grade (Year 10 in England) · 15 questions · Common Core: NGSS.HS-LS3-2, NGSS.HS-LS3-3, NGSS.HS-LS1-4, NGSS.MS-LS3-2 · England: KS4 Combined Science: Evolution, inheritance and variation, KS4 Combined Science: Cell biology, GCSE Combined Science: Cell biology

Name

Date

Score/ 15

  1. Question 1

    Before a cell divides by mitosis, what must it do?

    • A. halve its chromosomes
    • B. stop respiring
    • C. lose its nucleus
    • D. copy its DNA

  2. Question 2

    Mitosis or meiosis? It keeps the full number of chromosomes (46 in humans).

    • A. mitosis
    • B. meiosis

  3. Question 3

    Prokaryotes and eukaryotes: which statement is NOT true?

    • A. Bacterial cells are much smaller than most animal and plant cells.
    • B. Bacteria have mitochondria.
    • C. Some bacteria have a flagellum to move.
    • D. Both prokaryotic and eukaryotic cells have ribosomes.

  4. Question 4

    A population of 200 bacteria contains 2% that are resistant to an antibiotic. The antibiotic kills all the others. How many bacteria survive?

    Answer

  5. Question 5

    Catalase in liver broke down hydrogen peroxide and released 8 cm³ of oxygen in 40 s. What was the mean rate of reaction, in cm³/s?

    Answercm³/s

  6. Question 6

    In a root tip slide, 400 cells were counted. 60 of them were dividing. The cell cycle takes 40 hours. Estimate how long mitosis lasts, in hours.

    Answerh

  7. Question 7

    A onion plant sperm cell has 8 chromosomes. It fertilises an egg cell from the same species. How many chromosomes does the zygote (fertilised egg) have?

    Answer

  8. Question 8

    Why can an enzyme only act on one type of substrate?

    • A. Other substrates are dead
    • B. Only that substrate fits the shape of its active site
    • C. Enzymes are too big
    • D. Enzymes are used up after one reaction

  9. Question 9

    Two Bb parents have 200 offspring. Brown fur is dominant. About how many offspring would you expect to have white fur?

    Answer

  10. Question 10

    A human enzyme has an optimum temperature of about 37 °C. What is the enzyme most likely to be doing at 15 °C?

    • A. working slowly, but not denatured
    • B. working at or near its fastest rate
    • C. denatured and no longer working

  11. Question 11

    Where is this found: cytoplasm?

    • A. prokaryotic cells only
    • B. eukaryotic cells only
    • C. both types of cell

  12. Question 12

    A body cell of a cat has 38 chromosomes. It divides by mitosis. How many chromosomes are in each new cell?

    Answer

  13. Question 13

    A bacterium divides into two every 60 minutes. Starting with one cell, how many cells are there after 4 hours (if none die)?

    Answer

  14. Question 14

    Enzymes: which statement is NOT true?

    • A. Most human enzymes work best at about 37 °C.
    • B. Enzymes are proteins.
    • C. Cold temperatures denature enzymes permanently.
    • D. Enzymes are biological catalysts.

  15. Question 15

    In humans, which pair of sex chromosomes does a typical male have?

    • A. XXY only
    • B. XY
    • C. YY
    • D. XX

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Answer key: 9th grade cells, genetics and evolution

  1. 1. D. copy its DNA

  2. 2. A. mitosis

  3. 3. B. Bacteria have mitochondria.

  4. 4. 4

  5. 5. 0.2 cm³/s

  6. 6. 6 h

  7. 7. 16

  8. 8. B. Only that substrate fits the shape of its active site

  9. 9. 50

  10. 10. A. working slowly, but not denatured

  11. 11. C. both types of cell

  12. 12. 38

  13. 13. 16

  14. 14. C. Cold temperatures denature enzymes permanently.

  15. 15. B. XY