WorksheetsThe Structure of DNA
Total questions: 19
Worksheet time: 11mins
Name
Class
Date
1.
1. What does DNA stand for?
a)
Deoxynitrogenous Acid
b)
Deribo Nuclein Acid
c)
Deoxyribonucleic Acid
d)
Denatured Nucleic Acid
2.
2. What shape is a DNA molecule?
a)
Triple Helix
b)
Single Helix
c)
Double Helix
d)
Quadruple Helix
3.
3. There are four nitrogenous bases found in DNA. Three are cytosine, adenine and guanine. What is the fourth?
a)
Thymine
b)
Trimine
c)
Adenosyne
d)
Ribose
4.
4. The bases form complimentary base pairs. Which pairs shown are correct?
a)
A - T and C - G
b)
A - C and T - G
c)
A - G and C - T
5.
6. What is the name of the repeating units (monomers) that make up DNA?
a)
Nucleus
b)
Nucleotides
c)
Amino Acids
d)
Monosaccharides
6.
7. Which type of bonds form between complementary base pairs?
a)
Oxygen
b)
Hydrogen
c)
Phosphodiester
d)
Covalent
7.
8. In a double stranded DNA molecule, the percentage of cytosine is 18. What would be the percentage of thymine?
a)
32%
b)
16%
c)
64%
d)
18%
8.
9. If a double stranded DNA has 20% of guanine, what will be the percentage of adenine in it?
a)
30%
b)
60%
c)
15%
d)
20%
9.
10. A DNA strand has the following bases: A A G C C A. What are the bases on its complimentary strand?
a)
A A G C C A
b)
A C C G A A
c)
T T C G G T
d)
C C A T T C
10.
11. Based on the image of the DNA molecule, what would letter Y be?
a)
Thymine
b)
Cytosine
c)
Adenine
d)
Deoxyribose
11.
12. Based on the DNA model, what does letter S represent?
a)
Deoxyribose Sugar
b)
Nitrogenous Base
c)
Hydrogen Bonds
d)
Phosphate Group
12.
13. How many total base pairs are there in the DNA molecule shown?
a)
1
b)
2
c)
3
d)
4
e)
5
13.
14. What two things make up the “backbone” of DNA?
a)
Nitrogenous Bases, Phosphates
b)
Nitrogenous Bases, Deoxyribose Sugar
c)
Deoxyribose Sugar, Phosphates
14.
15. DNA makes up genes which are found on Chromosomes. How many pairs of chromosomes do humans have in their cells?
a)
13
b)
23
c)
46
d)
20
15.
16. What structure in the cell contains all the genetic material in the cell?
a)
Ribosome
b)
Cytoplasm
c)
Chlorophyll
d)
Nucleus
16.
In a molecule of double-stranded DNA, the amount of Adenine present is always equal to the amount of
a)
cytosine
b)
guanine
c)
thymine
d)
uracil
17.
Adenine bonds with ______________.
a)
Guanine
b)
Thymine
c)
Cytosine
d)
Adenine
18.
Guanine bonds with ______________.
a)
Adenine
b)
Guanine
c)
Cytosine
d)
Thymine
19.
Why is DNA important?
a)
it is very small and very complicated
b)
it's in everything
c)
it serves as the blueprint for traits of all living things
d)
because we eat it every day for energy
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