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A-Level Biology Quiz am Cellular control , erstellt von b187083 am 17/02/2016.

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Cellular control

Frage 1 von 11

1

What do genes code for?

Wähle eine der folgenden:

  • Polypeptides

  • Sugars

  • Hormones

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Frage 2 von 11

1

The genetic code is a duplet, degenerate code

Wähle eins der folgenden:

  • WAHR
  • FALSCH

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Frage 3 von 11

1

Fülle die Lücken, um den Text zu vervollständigen.

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 .

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Frage 4 von 11

1

How does cyclic AMP activate proteins?

Wähle eine der folgenden:

  • By removing an amino acid

  • By adding an enzyme

  • By altering their three-dimensional structure

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Frage 5 von 11

1

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

Wähle eins der folgenden:

  • WAHR
  • FALSCH

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Frage 6 von 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.

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    absent
    repressor
    lactose
    region
    protein
    promoter
    polymerase
    structural
    mRNA
    translated

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Frage 7 von 11

1

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

Wähle eins der folgenden:

  • WAHR
  • FALSCH

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Frage 8 von 11

1

Which of these statements are true about apoptosis?

Wähle eine oder mehr der folgenden:

  • 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

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Frage 9 von 11

1

How many stages are there in meiosis?

Wähle eine der folgenden:

  • 4

  • 8

  • 19

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Frage 10 von 11

1

Wähle von der Dropdown-Liste, um den Text zu vervollständigen.

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.

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Frage 11 von 11

1

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

Wähle eins der folgenden:

  • WAHR
  • FALSCH

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