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Genes And DNA
Test Description: Quiz review for Chapter 4. You will need a codon chart for some questions.
Instructions: Answer all questions to get your test result.
1) How many codons equal 3 amino acids?
A
3
B
1
C
4
D
2
2) What is the sugar in DNA called?
A
deoxyribose
B
ribose
C
deoxyfructose
D
glucose
3) Which mRNA codon codes for Lysine (lys)?
A
UUU
B
GAU
C
AAA
D
GAC
4) How many bases are needed for 4 amino acids?
A
16
B
12
C
4
D
1
5) The four nitrogenous bases in RNA are:
A
A T C G
B
U U A G
C
A U C G
D
A B C D
6) The mRNA bases form codons and the tRNA holds the complementary _______ .
A
adenine
B
anticodons
C
amino acids
D
cytosine
7) A nucleotide consists of a sugar, a base, and a __________ .
A
phosphate
B
deoxyribose
C
guanine
D
ribose
8) __________ carries the DNA code from the nucleus to the ribosome.
A
Nucleotide
B
mRNA
C
tRNA
D
DNA
9) Proteins are composed of smaller subunits called ____________ .
A
nucleotides
B
sugars
C
adenines
D
amino acids
10) If a sample of DNA has 20% cytosine, how much adenine is in the sample?
A
30%
B
35%
C
20%
D
25%
11) One of the 4 bases in RNA - pairs with adenine.
A
guanine
B
cytosine
C
thymine
D
uracil
12) molecule that delivers amino acids to the ribosome to synthesize a protein
A
mRNA
B
tRNA
C
DNA
D
amino acid
13) To replicate, a DNA molecule
A
loses its phosphates
B
must make tRNA
C
dissolves its sugar molecules
D
splits apart at the hydrogen bonds
14) A(n) _________ is a segment of DNA that holds instructions for a trait.
A
gene
B
base
C
amino acid
D
protein
15) Nine bases in an mRNA sequence equals how many amino acids?
A
9
B
3
C
12
D
1
16) Nine bases in an mRNA sequence equals how many codons?
A
9
B
3
C
12
D
1
17) If there is 35% guanine in a sample of DNA, how much thymine is in the sample?
A
20%
B
15%
C
10%
D
35%
18) CUG codes for which amino acid?
A
glycine
B
proline
C
leucine
D
arginine
19) Which mRNA codon codes for valine?
A
GCU
B
GUU
C
GGU
D
GAU
20) The sides of the DNA double helix are made of alternating phosphates and ______ .
A
proteins
B
sugars
C
bases
D
adenines
*select an answer for all questions
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