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A-Level Biology Quiz on Cellular control , created by b187083 on 17/02/2016.

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Cellular control

Question 1 of 11

1

What do genes code for?

Select one of the following:

  • Polypeptides

  • Sugars

  • Hormones

Explanation

Question 2 of 11

1

The genetic code is a duplet, degenerate code

Select one of the following:

  • True
  • False

Explanation

Question 3 of 11

1

Fill the blank spaces to complete the text.

A gene to be unwinds and unzips. The length of DNA that makes up the gene dips into the . bonds between bases break. RNA nucleotides bind to their exposed complementary bases. This is catalysed by . The two extra are released which releases energy for bonding adjacent nucleotides. The mRNA is complementary to the nucleotide base sequence on the strand of the DNA. Therefore it is a of the base sequence on the strand of the length of DNA. The mRNA is released from the DNA and passes through a to a .

Explanation

Question 4 of 11

1

How does cyclic AMP activate proteins?

Select one of the following:

  • By removing an amino acid

  • By adding an enzyme

  • By altering their three-dimensional structure

Explanation

Question 5 of 11

1

Mutations cause changes to the sequence of amino acids in DNA molecules

Select one of the following:

  • True
  • False

Explanation

Question 6 of 11

1

When lactose is from the growth medium:
The regulator gene is expressed and the protein is synthesised. It has two binding sites, on the binds to and one that binds to the operator . The repressor binds to the operator region. In doing so it covers part of the region, where RNA normally attaches. RNA polymerase cannot bind to the promoter region so the genes cannot be transcribed into . Without mRNA these genes cannot be and the enzymes cannot be synthesised.

Drag and drop to complete the text.

    absent
    repressor
    lactose
    region
    protein
    promoter
    polymerase
    structural
    mRNA
    translated

Explanation

Question 7 of 11

1

Genes that control development of body plans are similar in plants, animals and fungi

Select one of the following:

  • True
  • False

Explanation

Question 8 of 11

1

Which of these statements are true about apoptosis?

Select one or more of the following:

  • It can act as a mechanism to change body plans

  • It is programmed cell death

  • It is the same as cell necrosis

  • It is controlled by cell signals originating only from inside the cells

  • Lack of apoptosis during development may cause syndactyly

Explanation

Question 9 of 11

1

How many stages are there in meiosis?

Select one of the following:

  • 4

  • 8

  • 19

Explanation

Question 10 of 11

1

Select from the dropdown lists to complete the text.

An allele is a version of a ( gene, chromosome, chromatid ). A gene is a length of DNA that codes for one or more ( polypeptides, carbohydrates, cell membranes ).
The locus is the ( position, direction, completion ) of a gene on a chromosome.
( Crossing, Keeling, Swapping ) over is when lengths of DNA are swapped from one chromatid to another.

Explanation

Question 11 of 11

1

The genotype refers to the characteristics that are expressed in the organism. The phenotype is the genetic makeup of an organism.

Select one of the following:

  • True
  • False

Explanation

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