Protein Synthesis Answers

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1
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Which molecule brings amino acids to the ribosomes to be assembled into proteins?

A
tRNA
B
mRNA
C
peptide
D
codon
2
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The diagram shows one step in the process of protein synthesis.Which step is shown?

Question illustration
A
transpiration
B
translocation
C
transcription
D
translation
3

Which describes the function of a peptide bond?'

A
It connects amino acids.
B
It connects ribosomes.
C
It connects tRNA.
D
It connects anticodons.
4

Which is composed of amino acids and determines all the structures and functions of organisms?

A
DNA
B
ribosome
C
mRNA
D
protein
5

Which summary below correctly describes what occurs during transcription?

A
A DNA template is used to create an mRNA strand.
B
An mRNA template is used to create a DNA strand.
C
A DNA template is used to create a ribosome.
D
An mRNA template is used to create a tRNA strand.
6

The study of Escherichia coli (E. coli) led researchers to new experimental designs for studying operons. Which experimental design did the scientists use?

A
Used a microscope to observe cell division to determine the structure of operons.
B
Tested the response of E. coli to a variety of chemicals to determine the number of operons that are present.
C
Inserted the operons from one organism into another to determine the mechanism of operon expression.
D
Read the genome sequence to determine the quantity and organization of operons.
7

What is the role of RNA polymerase?

A
It creates the DNA strand.
B
It bonds the DNA strand.
C
It helps transcribe the DNA strand.
D
It translates the DNA strand.
8

Which nucleic acid provides the master code for protein synthesis?

A
DNA
B
RNA
C
mRNA
D
tRNA
9

Only the proteins that the bacteria Escherichia coli (E. coli) needs are synthesized at any given time. For example, when lactose is available in the environment, E. coli will express the lac genes that allow it to break down lactose to obtain energy. When lactose is not present, these genes are not expressed.Which prevents the lac genes in the DNA of E. coli from being expressed most of the time?

Question illustration
A
the lac repressor
B
the lac operator
C
the lac promoter
D
the lac locator
10

Which describes a promoter?

A
the first part of an operon that regulates where, when, and to what level a gene is expressed
B
the part of an operon that, if attached by a repressor protein, suppresses the expression of a gene
C
a cluster of genes that are expressed or repressed as a group
D
an enzyme that helps DNA unzip prior to transcription

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