Protein Synthesis & Transcription Flashcards

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1
Q

What are the different types of RNA made in the nucleus?

A
  • messenger RNA (mRNA)
  • transfer RNA (tRNA)
  • ribosomal RNA (rRNA)
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2
Q

What type of RNA is formed in the nucleus in the same way as DNA is replicated?

A
  • mRNA
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3
Q

What is the process of mRNA formation called?

A
  • transcription
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4
Q

What is transcription?

A
  • the process by which DNA makes and codes mRNA
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5
Q

How does the process of transcription start?

A
  • when a small piece of DNA, a gene, unwinds
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6
Q

What catalyses the initial unwinding of a gene in transcription?

A
  • the enzyme RNA polymerase
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7
Q

What does RNA polymerase specifically do?

A
  • causes the 2 strands of DNA to separate
  • by breaking the hydrogen bonds between complementary DNA nucleotides
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8
Q

What happens during transcription after the gene unwinds?

A
  • the polymerase attaches to and moves along one of the DNA strands
  • causing new nucleotides to pair up with their complementary nucleotides
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9
Q

What happens during transcription after the new nucleotides pair up with their complementary nucleotides?

A
  • the nucleotides join up
  • a sugar-phosphate backbone is added
  • a new strand of mRNA is formed
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10
Q

What is the sequence of nucleotides in a strand of mRNA determined by?

A
  • the sequence of the template DNA nucleotides
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11
Q

What happens after a completed mRNA strand is formed during transcription?

A
  • it breaks away from the DNA
  • the DNA then re-zips
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12
Q

What happens to the newly formed strand of mRNA after transcription has occurred?

A
  • it moves through the pores of the nuclear membrane
  • carries the genetic code to the ribosomes
  • which are the sites of protein synthesis
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13
Q

What is a protein?

A
  • a long chain (polymer) of small units (monomers) called amino acids
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14
Q

How many different amino acids are there involved in protein synthesis?

A
  • 20
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15
Q

What determines the kind of protein that is made?

A
  • the order in which the amino acids are linked
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16
Q

What is the sequence of amino acids determined by?

A
  • the instructions from the genetic code in the DNA molecules
  • which is passed on to mRNA
17
Q

What is a genetic code?

A
  • a sequence of codons
18
Q

What is a codon?

A
  • codon is a sequence of three nucleotides in DNA that codes for an amino acid or a stop signal in protein synthesis
19
Q

How many different codons are there and how many form proteins?

A
  • 64 different codons
  • all except 3 code for one of the 20 amino acids used to form proteins
20
Q

What is the basis of the genetic code?

A
  • the triplet code of bases
21
Q

What is a gene made up of?

A
  • a group of codons that code for the synthesis of one protein
22
Q

What does the order of codons in mRNA determine?

A
  • the sequence of the amino acids
  • which determines which protein is made