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A-Level Biology Quiz sobre Cellular control , criado por b187083 em 17-02-2016.

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Cellular control

Cellular control

Questão 1 de 11

1

What do genes code for?

Selecione uma das seguintes:

  • Polypeptides

  • Sugars

  • Hormones

Explicação

Questão 2 de 11

1

The genetic code is a duplet, degenerate code

Selecione uma das opções:

  • VERDADEIRO
  • FALSO

Explicação

Questão 3 de 11

1

Preencha os espaços em branco para completar o texto.

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 .

Explicação

Questão 4 de 11

1

How does cyclic AMP activate proteins?

Selecione uma das seguintes:

  • By removing an amino acid

  • By adding an enzyme

  • By altering their three-dimensional structure

Explicação

Questão 5 de 11

1

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

Selecione uma das opções:

  • VERDADEIRO
  • FALSO

Explicação

Questão 6 de 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.

Arraste e solte para completar o texto.

    absent
    repressor
    lactose
    region
    protein
    promoter
    polymerase
    structural
    mRNA
    translated

Explicação

Questão 7 de 11

1

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

Selecione uma das opções:

  • VERDADEIRO
  • FALSO

Explicação

Questão 8 de 11

1

Which of these statements are true about apoptosis?

Selecione uma ou mais das seguintes:

  • 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

Explicação

Questão 9 de 11

1

How many stages are there in meiosis?

Selecione uma das seguintes:

  • 4

  • 8

  • 19

Explicação

Questão 10 de 11

1

Selecione das listas do Menu para completar o texto.

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.

Explicação

Questão 11 de 11

1

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

Selecione uma das opções:

  • VERDADEIRO
  • FALSO

Explicação

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