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Cellular control

b187083 11 preguntas

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Preguntas del test (11)

  1. 1What do genes code for?
    1. APolypeptides
    2. BSugars
    3. CHormones
  2. 2The genetic code is a duplet, degenerate code
    1. AVerdadero
    2. BFalso
  3. 3A gene to be [blank_start]transcribed[blank_end] unwinds and unzips. The length of DNA that makes up the gene dips into the [blank_start]nucleolus[blank_end]. [blank_start]Hydrogen[blank_end] bonds between [blank_start]complementary[blank_end] bases break. RNA nucleotides bind to their exposed complementary bases. This is catalysed by [blank_start]RNA polymerase[blank_end]. The two extra [blank_start]phosphates[blank_end] are released which releases energy for bonding adjacent nucleotides. The mRNA is complementary to the nucleotide base sequence on the [blank_start]template[blank_end] strand of the DNA. Therefore it is a [blank_start]copy[blank_end] of the base sequence on the [blank_start]coding[blank_end] strand of the length of DNA. The mRNA is released from the DNA and passes through a [blank_start]nuclear pore[blank_end] to a [blank_start]ribosome[blank_end].
    1. Atranscribed
    2. Bnucleolus
    3. Ccomplementary
    4. DHydrogen
    5. ERNA polymerase
    6. Fphosphates
    7. Gtemplate
    8. Hcopy
    9. Icoding
    10. Jnuclear pore
    11. Kribosome
  4. 4How does cyclic AMP activate proteins?
    1. ABy removing an amino acid
    2. BBy adding an enzyme
    3. CBy altering their three-dimensional structure
  5. 5Mutations cause changes to the sequence of amino acids in DNA molecules
    1. AVerdadero
    2. BFalso
  6. 6When lactose is [blank_start]absent[blank_end] from the growth medium:
    The regulator gene is expressed and the [blank_start]repressor[blank_end] protein is synthesised. It has two binding sites, on the binds to [blank_start]lactose[blank_end] and one that binds to the operator [blank_start]region[blank_end]. The repressor [blank_start]protein[blank_end] binds to the operator region. In doing so it covers part of the [blank_start]promoter[blank_end] region, where RNA [blank_start]polymerase[blank_end] normally attaches. RNA polymerase cannot bind to the promoter region so the [blank_start]structural[blank_end] genes cannot be transcribed into [blank_start]mRNA[blank_end]. Without mRNA these genes cannot be [blank_start]translated[blank_end] and the enzymes cannot be synthesised.
    1. Aabsent
    2. Brepressor
    3. Clactose
    4. Dregion
    5. Eprotein
    6. Fpromoter
    7. Gpolymerase
    8. Hstructural
    9. ImRNA
    10. Jtranslated
  7. 7Genes that control development of body plans are similar in plants, animals and fungi
    1. AVerdadero
    2. BFalso
  8. 8Which of these statements are true about apoptosis?
    1. AIt can act as a mechanism to change body plans
    2. BIt is programmed cell death
    3. CIt is the same as cell necrosis
    4. DIt is controlled by cell signals originating only from inside the cells
    5. ELack of apoptosis during development may cause syndactyly
  9. 9How many stages are there in meiosis?
    1. A4
    2. B8
    3. C19
  10. 10An allele is a version of a [blank_start]gene[blank_end]. A gene is a length of DNA that codes for one or more [blank_start]polypeptides[blank_end].
    The locus is the [blank_start]position[blank_end] of a gene on a chromosome.
    [blank_start]Crossing[blank_end] over is when lengths of DNA are swapped from one chromatid to another.
    1. Agene
    2. Bchromosome
    3. Cchromatid
    4. Dpolypeptides
    5. Ecarbohydrates
    6. Fcell membranes
    7. Gposition
    8. Hdirection
    9. Icompletion
    10. JCrossing
    11. KKeeling
    12. LSwapping

Información

Descripción
A-Level Biology Test sobre Cellular control , creado por b187083 el 17/02/2016.
Autor
b187083
Idioma
English
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