Protein Synthesis Flashcards

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1
Q

Stop codons code for …

A

no amino acid

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2
Q

Damage to DNA can be caused by

A

UV Radiation

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3
Q

How does RNA differ from DNA?

A

It contains uracil and is single stranded

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4
Q

What is the flow of genetic information

A

DNA-RNA-Proteins

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5
Q

What is the transcription start signal?

A

The promoter

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6
Q

3 codons that don’t signify amino acids are

A

stop codons

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7
Q

DNA is composed of 2 strands, by what mechanism is the right one chosen?

A

The promoter aims the RNA polymerase

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8
Q

How many different polymerases are in eukaryotes?

A

3

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9
Q

Which molecule transfers information from one generation to the next?

A

DNA

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10
Q

Which molecules transfer information from RNA to proteins?

A

tRNA

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11
Q

3 RNA bases function as both…

A

codons and anticodons

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12
Q

Ribosomes are a collection of … and … that are needed for …

A

proteins and small RNAs , translation

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13
Q

what events must take place to ensure that the protein made Is the one specified by the mRNA?

A

tRNA must read mRNA correctly and tRNA must carry the amino acid correct for the reading

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14
Q

The enzyme that charges the tRNA molecules with appropriate amino acids is

A

aminoacyl RNA synthetase

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15
Q

During translation initiation, the 1st site occupied by a tRNA is the

A

p site

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16
Q

Breaking and rejoining of chromosomes can lead to

a. deletions.
b. duplications.
c. inversions.
d. translocations.

A

all of the above

17
Q

What do genes code for?

a. enzymes.
b. polypeptides.
c. RNA.

A

All of the above

18
Q

Which molecules transfer messages to the cytoplasm?

A

mRNA

19
Q

Transcription is the process of…

A

the process by which the information in a strand of DNA is copied into a new molecule, RNA being produced

20
Q

Mutations are changes in the sequence of

A

Dna bases

21
Q

What is the first step of protein synthesis called?

A

Transcription

22
Q

What is the second step of protein synthesis called?

A

Translation

23
Q

Where does the first step occur?

A

In the nucleus

24
Q

Where does the second step occur?

A

in the cytoplasm on the ribosome

25
Q

A-
T-
G-
C-

A

Uracil
Adenine
Cytosine
Guanine

26
Q

Nitrogen bases are read by the ribosome … bases at a time

A

three

27
Q

Sets of three bases on the mRNA strand are called

A

codons

28
Q

Corresponding sets of codons are called

A

anticodons

29
Q

What is the start codon

A

AUG

30
Q

what are the 3 stop codons

A

UAA, UAG, UGA

31
Q

A bunch of amino acids put together makes

A

proteins

32
Q

What is the role of the RNA Polymerase?

A

Copies a DNA sequence into an RNA sequence, binds to the promoter and to the DNA strand

33
Q

What is the role of the Peptidyl transferase?

A

attaches one Amino acid to the corresponding amino acid on the chain

34
Q

aminoacyl synthatase

A

attaches the amino acid to the 3” end of the tRNA