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