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GCSEBiologyOCRBiology A (Gateway)Exam Questions1. Cell Level SystemsWhat Happens in Cells (& What do Cells Need?)

What Happens in Cells (& What do Cells Need?) (OCR GCSE Biology A (Gateway))

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What Happens in Cells (& What do Cells Need?)

1
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Which of the following statements would be the best description of DNA?

  • DNA is usually single-stranded.

  • DNA is a polymer of sugar molecules.

  • Every persons' DNA is unique.

  • DNA is a chemical molecule that determines the characteristics of living organisms. 

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2
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Which of the following are found in an individual monomer subunit of DNA?

  • Sugar group, adenine, thymine.

  • Phosphate group, sugar group, base.

  • Amino acid, sugar group, base.

  • Lipid, phosphate group, base

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3
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DNA is a large molecule made from two chains of nucleotides held together by cross-links between pairs of bases.

Which of the following is a correct base pair?

  • T with C

  • G with A

  • C with G

  • C with A

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4
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Which of the following best describes what an enzyme is?

  • A catalyst that speeds up reactions in cells, being used up in the process

  • A protein that speeds up reactions in cells, being used up in the process

  • A carbohydrate that functions as a biological catalyst

  • A protein that functions as a biological catalyst

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5
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Which graph in the image below shows the correct effect of temperature on the activity of an enzyme?

5-q3-temperature

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    6
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    Protein synthesis involves the process of transcription and translation using the following molecules:

    DNA

    Amino acids

    mRNA

    Protein

    In what order would these molecules be encountered in protein synthesis?

    • DNA→Amino acids→mRNA→Protein

    • mRNA→Amino acids→Protein→DNA

    • DNA→mRNA→Amino acids→Protein

    • DNA→mRNA→Protein→Amino acids

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    7
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    In DNA, which base does T (thymine) pair with?

    • A

    • C

    • G

    • T

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    8
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    Insulin is a protein made of 51 amino acids.

    How many bases are in the length of DNA coding for insulin?

    • 51

    • 102

    • 153

    • 204

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    9
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    Which does not contain DNA?

    • Cell membrane

    • Chromosome

    • Nucleus

    • Plasmid

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    10
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    During protein synthesis the DNA that codes for a particular protein is copied. This copy is called mRNA.

    The diagram below shows the base sequence for a section of DNA.

    G    G    T    G    C    A    T    A    T

    What would be the complementary sequence of mRNA for this section of DNA?

    • C  C  A  C  G  T  A  T  A

    • C  C  A  C  G  U  A  U  A

    • G  G  T  G  C  A  T  A  T

    • G  G  U  G  C  A  U  A  U

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    11
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    How many strands are there in a DNA molecule?

    • 1

    • 2

    • 3

    • 4

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    12
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    DNA is a polymer.

    What is the name of the monomer in DNA?

    • Base

    • Deoxyribose sugar

    • Nucleotide

    • Phosphate

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    13
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    DNA is made of two complementary strands.

    The diagram shows part of one strand of DNA.

    q8-paper1f-june2018-ocrgcsebio

    Which base sequence would be found on the complementary strand of this DNA?

    • A C T

    • C A G

    • G A C

    • T G A

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    14
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    Which structure most closely resembles DNA?

    q3-paper1h-june2019-ocrgcsebio

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      15
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      Look at the model of enzyme activity.

      q4-paper1h-june2019-ocrgcsebio

      Which label represents the active site of an enzyme?

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        16
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        Which biological molecule is not a polymer?

        • Amylase

        • DNA

        • Nucleotide

        • Starch

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        17
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        In a sample of DNA, 23% of the bases are cytosine.

        What percentage of the bases are adenine?

        • 23%

        • 27%

        • 46%

        • 54%

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        18
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        How many different bases are in DNA?

        • 2

        • 4

        • 23

        • 46

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