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Biology 1310 Test 2
Question | Answer |
---|---|
Name the organelle where the synthesis of mRNA takes place. | Nucleus |
Name the organelle where the codon and anticodon couplings take place. | ribosome |
____ is coiled in a double helix | DNA |
___ contains thymine | DNA |
___ and ___ contain thymine | DNA RNA |
___ contains uracil | RNA |
___ brings amino acids to the ribosome | mRNA |
______ is present in the ribosome | Ribosomal RNA |
____ is involved in transcription | DNA polymerase |
___ is involved in translation | RNA |
The genetic code depends on bases in groups of ____ | three |
If mRNA is transcribed from a chain of DNA with the base sequence 3'CATTAG5' the mRNA will have the sequence | GUAAUC |
DNA but not RNA contains ____ | thymine |
Transfer RNA functions in ____ | Carrying amino acids to the correct site on the mRNA |
How many amino acids would the polypeptide encoded by this gene segment have? | four |
The second codon on the mRNA derived from the segment will be | UGG |
The anticodon of the tRNA for the third codon on the mRNA will be | BGGF |
According to the current ideas about the DNA genetic code which one of the following statements is false? | Every possible triplet codes for the same amino acid |
Which one of the following statements is false? | The nucleolus is a specialized region of a chromosome where tRNA is synthesized |
Though a gene codes ultimately for all aspects of a protein's structure it codes directly for ___ | A primary structure |
As proteins are being synthesized, tRNA molecules are constantly being released from the site of amino acid incorporation. What happens to these tRNA molecules? | They pick up another amino acid of the same type that they had before |
A certain gene codes for a polypeptide that is 126 amino acids long. The portion of the gene that codes for this polypeptide is probably how many nucleotides long? | 378 = 3*126 |
An intron is ____ | an RNA sequence that is edited from a transcript before translation |
A nonsense mutation is one in which the substitution of one nucleotide for another results in a triplet ____ | that does not code for any amino acid |
Active beef insulin is a small protein composed of 51 amino acids. How many nucleotide units does it take to code for this protein? | 153 |
The nucleolus is a specialized region of a chromosome where tRNA is synthesized. | false |
In base substitution mutations only a single nucleotide of a gene is altered | True |
Molecules of mRNA are synthesized on the ribosomes from nucleotides brought by tRNA | false |
Some amino acids are specified by several synonymous codons | true |
How many possible codes are there for the universal genetic code? | 64 |
In the genetic code how many stop codes are there? | 3 |
tRNA is coiled in a double helix | false |
mRNA and DNA contain thymine | false |
mRNA and DNA contain cytosine | true |
mRNA and DNA contain uracil | false |
mRNA brings amino acids to the ribosome | false |
RNA and many enzymes are present in the ribosome | true |
RNA and polymerase is involved in transcription | true |
tRNA mRNA and ribosomes are involved in translation | true |
A missense mutation is one in which the substitution of one nucleotide for another results in a triplet _____ | that codes for a different amino acid |
The enzyme that put an amino acid on tRNA is called aminoacyl synthetase | true |
The long chain of amino acids in a protein is called the | Primary sturcture |
The many folded chain of amino acids in a protein is called or referred to as the ___ | tertiary structure |
Heat shock proteins are produced to aid in stabilizing the primary structure of a protein | True |
Chaperones help form the tertiary structure of proteins | False |
Amino acids can fold ___ ways so a 100 amino acid protein can fold in ___ different ways | 3, 100 |
According to the second law of thermodynamics the folding of proteins follows an energy landscape that seeks the most unstable shape. | False |
Hydrophobic amino acids nestle themselves in the __ of the __ water | Center, away from |
Polar amino acids stick __ of the molecule __ the water | outside, into |
The push and pull of amino acids against each other determines its original protein | true |
The protein that blocks the transcription of a gene would be made by the ___ | regulatory gene |
Lactose will block which of the following? | Regulatory gene |