Worksheets25-26 1.1 Quiz Retakes
Total questions: 10
Worksheet time: 5mins
The image shows a segment of DNA that produces a polypeptide with the amino acids valine–histidine–leucine–threonine. A table lists the mRNA codons for these amino acids: valine (GUU, GUC, GUA, GUG), histidine (CAU, CAC), leucine (CUU, CUC, CUA, CUG, UUA, UUG), threonine (ACU, ACC, ACA, ACG). From which mRNA segment was the polypeptide translated?
GTG CAU CTG ACT
GUG CAU CTG ACT
GUG CAU CUG ACU
CAC GUA GAC UGA
Red blood cells contain the hemoglobin protein that carries oxygen. Sequences shown indicate sections of DNA for normal and abnormal hemoglobin: normal DNA sequence GGA CTC CTC; abnormal DNA sequence GGA CAC CTC. A codon–amino acid table provides mRNA codons and their amino acids (examples include GUG valine, CAC histidine, CUC leucine, ACU threonine, CCU proline, GAG glutamic acid). Which amino acids are coded for by the abnormal DNA?
histidine, leucine, valine
histidine, threonine, valine
proline, valine, glutamic acid
proline, leucine, glutamic acid
The table describes steps in protein production: W—Amino acids form a polypeptide chain; X—mRNA is transcribed from DNA; Y—Ribosome translates mRNA; Z—mRNA leaves the nucleus. Which sequence correctly orders these steps in a cell?
X–Z–Y–W
Z–X–Y–W
X–Y–Z–W
Z–Y–X–W
Every copy of a particular protein produced by a cell shows the same incorrect amino acid at the same position. According to the central dogma of molecular biology, in which structure does this error originate?
DNA
mRNA
tRNA
rRNA
Use the mRNA codon chart to answer: A protein has the amino acid sequence methionine–phenylalanine–proline–serine–histidine. What is the nucleotide sequence on the DNA template strand that codes for this sequence?
TAC AAG GGT AGG GTA
TAC AAG GGT AGG GTG
UAC AAG GAA GGG TGG
UAC AAG GGU AGG GUG
What is the role of mRNA during protein synthesis?
to bind to protein molecules and form ribosomes
to carry out the termination of a polypeptide chain
to carry genetic information from the DNA in the nucleus to the ribosomes for translation
to recognize a specific codon and to deliver the corresponding amino acid to the ribosome
The image shows DNA being transcribed to RNA and then translated into a short protein with amino acids labeled Met, Ile, and Ser. Which statement is true for the process shown?
DNA and RNA strands join to form the protein.
The nucleotide sequence of DNA determines the sequence of the protein.
RNA is the original source of the genetic sequence of the protein.
RNA transfers information to DNA for the formation of the protein.
A segment of DNA from a cell is shown with the original strand labeled G T A T C in five boxes. If the cell completes replication correctly, what is the complementary DNA sequence for this segment?
C A T A G
G T A T C
T A T A C
C A U A G
A section of DNA codes for the sequence of nitrogenous bases of mRNA as shown: DNA GATACGCT → mRNA CUAUGCGA. What is the process involved in this coding?
replication
transcription
transduction
translation
Using the Universal Genetic Code and the given sequences, determine the peptide translated from the mRNA AUG AAC GAC ACA CUC GCU.
Met–Asn–Asp–Thr–Leu–Ala
Met–Lys–Asp–Thr–Leu–Ala
Met–Asn–Glu–Thr–Leu–Ala
Met–Asn–Asp–Ser–Leu–Ala
