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DNA Structure/Replication

Total questions: 43

Worksheet time: 45mins

Name
Class
Date
1.
Which of the following units are repeatedly joined together to form a strand of DNA?
a)
amino acids
b)
nucleotides
c)
fatty acids
d)
polysaccharides
2.
The enzyme that unwinds the DNA to prepare for replication
a)
helicase
b)
replicase
c)
polymerase
d)
synthase
3.
DNA replication results in two DNA molecules,
a)
each one with two original strands
b)
each one with two new strands
c)
each one with one new strand and one original strand
d)
one with two new strands and the other with two original strands
4.
A process in which DNA has the unique ability to make an exact copy of itself.
a)
Replication
b)
Translation
c)
Transcription
5.
Which enzyme is responsible for adding nucleotides?
a)
Topoisomerase
b)
DNA Polymerase
c)
Ligase
d)
Primase
6.
The process of DNA replication is called semi conservative because it results in
a)
none of these
b)
Two DNA molecules.  One original molecule and one with two new strands
c)
two exact copies with new strands
d)
two identical molecules, each with 1 original strand and one new.
7.
Why does DNA replicate?
a)
To create another copy for the new cell
b)
To create a duplicate copy in case the original gets damaged
c)
To create a new copy to replace the damaged original
8.
Nitrogenous bases are joined by which type of bond?
a)
polar bonds
b)
ionic bonds
c)
covalent bonds
d)
hydrogen bonds
9.
Adenine bonds with ______________.
a)
Guanine
b)
Thymine
c)
Cytosine
d)
Adenine
10.
Guanine bonds with ______________.
a)
Adenine
b)
Guanine
c)
Cytosine
d)
Thymine
11.
What does DNA stand for?
a)
Deoxyribonucleic acid
b)
Denitrogenous acid
c)
Deribonucleic acid
d)
Diribonucleic acid
12.
Which 2 molecules forms the sides (backbone) of the DNA ladder?
a)
deoxyribose and adenine
b)
deoxyribose and a hydrogen bond
c)
sugar and the nucleus
d)
deoxyribose (sugar) and phosphate
13.
Which sequence of DNA bases would pair with this partial strand
ATG TGA CAG
a)
ATG TGA CAG
b)
TAC ACT GTC
c)
GTA AGT GAC
d)
CAT TCA CTG
14.
The two strands of DNA run in opposite directions. This is called
a)
Double helix
b)
Anti parallel
c)
Anti perpendicular
d)
double stranded
15.
Name this structure
a)
double helix
b)
nucelotide
c)
twisted ladder
d)
hydrogen bond
16.

What is needed for DNA replication to unzip at the hydrogen bonds?

a)

phosphates

b)

enzymes

c)

deoxyribose (sugar)

d)

hydrogen

17.

What is a mutation?

a)

Adenine

b)

a change/mistake in DNA

c)

a copy of the original DNA

d)

Guanine

18.

What causes mutations?

a)

the environment

b)

random assortment

c)

chemicals

d)

independent assortment

19.

DNA strand has the following bases AAGCCA what are the bases on the complementary strand

a)

GGCTTA

b)

TTGGGA

c)

CCAGGT

d)

TTCGGT

20.

Number 1 in the picture above

a)

Replication

b)

DNA Polymerase

c)

Primase

d)

Ligase

21.

#1 in the picture above (builder)

a)

Helicase

b)

Primase

c)

Polymerase

d)

Ligase

22.

Which letter in the picture below depicts the leading strand in DNA replication?

a)

A

b)

C

c)

B

d)

None of the above

23.

Which letter in the picture below depicts the lagging strand in DNA replication?

a)

A

b)

C

c)

B

d)

None of the above

24.

_____________: A change in the DNA sequence of a chromosome

a)

Translation

b)

Replication

c)

Transcription

d)

Mutation

25.
Are all mutations bad?
a)
Yes
b)
No
26.
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
27.

Most genes contain code to make

a)

cookies

b)

mutations

c)

adaptations

d)

protein

28.

A mutation cannot be inherited.

a)

True

b)

False

29.

The D in DNA stands for

a)

double stranded

b)

deoxyribo

c)

denature

d)

dicarbo

30.

Which of the following is NOT part of a nucleotide

a)

sugar

b)

phosphate

c)

nitrogen base

d)

amino acid

31.

The backbone of DNA is made of

a)

base pairs

b)

sugars and phosphates

c)

only sugars

d)

only phosphates

32.

The two strands of DNA are held together with

a)

covalent bonds

b)

hydrogen bonds

c)

nothing

33.

If a DNA molecule has 30% Guanine bases, how many Cytosine bases will it have?

a)

30%

b)

25%

c)

20%

d)

10%

34.

One function of DNA is to

a)

code for proteins

b)

code for lipids

c)

code for carbohydrates

35.

Bacteria DNA looks the same as human DNA structurally speaking

a)

True

b)

False

36.

Where do we find DNA?

a)

in the nucleus of cells

b)

in the ribosomes

c)

in the endoplasmic reticulum

37.

What are the four bases found in DNA?

a)

U, A, T, B

b)

B, O, A, T

c)

A, G, C, T

d)

U, V, W, X

38.

How many strands are in DNA?

a)

one

b)

two

39.
Which of the following best describes a DNA molecule?
a)
double helix
b)
contains ribose
c)
made of amino acids
d)
contains Uracil
40.
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
41.
Nitrogenous bases are joined by which type of bond?
a)
polar bonds
b)
ionic bonds
c)
covalent bonds
d)
hydrogen bonds
42.
What are the three components of a nucleotide?
a)
sugar, hydrogen, nitrogen base
b)
sugar, oxygen, nitrogen base
c)
sugar, phosphate, nitrogen base
d)
sugar, phosphate, protein
43.

What makes up the rungs (steps) of a DNA ladder?

a)

sugars & phosphates

b)

nitrogen bases

c)

sugars

d)

genes & chromosomes

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