15. Gene Expression

Genetic Code

Open Question
For each of these statements about the genetic code, select True or False.a. T/F Wobble pairing accounts for the redundancy of the genetic code.b. T/F There are 64 different tRNAs that read the 64 possible codons.c. T/F All possible codons are used, but not all codons specify an amino acid.d. T/F Some codons are recognized by proteins, not by tRNAs.
Multiple Choice
In many cases, more than one codon codes for the same amino acid. Because of this, we say that the code is __________.
Multiple Choice
A particular triplet of bases in the template strand of DNA is 5′-AGT-3′. What would be the corresponding codon for the mRNA that is transcribed?
Multiple Choice
A particular triplet of bases in the coding sequence of DNA is AAA. The anticodon on the tRNA that binds the mRNA codon is ________.
Multiple Choice
Which of the following sequences of nucleotides are possible in the template strand of DNA that would code for the polypeptide sequence Phe–Leu–Ile–Val?
Multiple Choice
What amino acid sequence will be generated, based on the following mRNA codon sequence? 5′–AUG–UCU–UCG–UUA–UCC–UUG–3′
Multiple Choice
Which statement is true?
Multiple Choice
When RNA is being made, the RNA base __________ always pairs with the base __________ in DNA.
Multiple Choice
Generally speaking, how many genetic codes are there?
Multiple Choice
The number of nucleotide bases "read" together on the mRNA to designate each amino acid is __________; this unit is called a(n) __________.
Multiple Choice
The codons AAA, CCC, GGG, and UUU specify the amino acids lysine, proline, glycine, and phenylalanine, respectively. If the base sequence 5′-CCCAAATTTGGG-3′ is present in the coding strand of a stretch of DNA, what polypeptide sequence would be encoded by the corresponding template strand?
Multiple Choice
How many nucleotides are needed to code for a protein with 450 amino acids?
Multiple Choice
Bacteria can transcribe and translate human genes to produce functional human proteins because __________.
Multiple Choice
The mRNA codons 5′-CAA-3′ or 5′-CAG-3′ are translated as the amino acid glutamine by __________.
Open Question
List the order of nucleotides on the mRNA that would be transcribed from the following DNA sequence: CGATTACTTA.