OCR Gateway GCSE Biology

Topic Questions

GCSEBiologyOCR GatewayTopic Questions1. Cell Level Systems1.2 What Happens in Cells (& What do Cells Need?)

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

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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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