BSC 1010 Chapter Notes - Chapter 7: Lac Operon, Thymine, Central Dogma Of Molecular Biology

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Published on 3 Jul 2019
School
FIU
Department
Biological Science
Course
BSC 1010
Professor
BSC 1010
Chapter Seven
Review Questions
1.
The 5' and 3' designations used in reference to DNA
and RNA sequences are assigned to the
carbon atoms of deoxyribose and
ribose.
2.
According to Chargaff's rules, ___ always pairs with
____, and _____ always pairs with _____.
A; T; G; C
3.
The central dogma of molecular biology states that
the information contained within the genes flows in
which direction?
DNA to mRNA to protein
4.
A change in a cell's DNA sequence is
a mutation.
5.
DNA sequence that signals a gene's start is a(n)
promoter.
6.
The DNA sub-units that form the "rungs" joining
the two sides of the DNA molecule are formed by
the
hydrogen bonds between
nitrogen base pairs.
7.
How can a single gene encode for more than one
protein?
by removing different
combinations of introns
8.
If an organism's DNA contains 20% adenine
nucleotides, what percentage of its DNA is
composed of guanine nucleotides?
30%
9.
If an organism's DNA contains 20% adenine
nucleotides, what percentage of its DNA is
composed of thymine nucleotides?
20%
10.
If E. coli bacteria are grown in the absence of
lactose, then the repressor will
bind the operator preventing
transcription of the lac operon
genes.
11.
If you compared the DNA sequence of a gene with
the sequence of the mature mRNA that was
transcribed from the gene you would find
the mRNA is shorter because it
does not contain introns.
12.
In eukaryotic cells, non-coding sequences of mRNA
that are removed from pre-mRNA molecule before
being translated are
introns.
13.
In ________ every three bases is a/an ________ that
codes for a/an ________.
mRNA; codon; amino acid
14.
The initiation, elongation, and termination occurs in
both the transcription or
translation.
15.
In prokaryotic cells a regulation of the gene
expression is controlled by group of the genes
transcribed together. These genes are called a(n)
operon.
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