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DNA Structure and Replication DQQ

Total questions: 25

Worksheet time: 14mins

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.
Which sequence of DNA bases would pair with this partial strand
CAT TCA CTG
a)

ATG TGA CAG

b)

TAC ACT GTC

c)

GTA AGT GAC

d)

CAT TCA CTG

3.
The enzyme that unwinds the DNA to prepare for replication
a)
helicase
b)
replicase
c)
polymerase
d)
synthase
4.
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
5.
In what phase of the cell cycle does DNA replication take place?
a)
G1
b)
S
c)
G2
d)
M
6.
Which enzyme is responsible for adding nucleotides?
a)

Topoisomerase

b)

DNA Polymerase

c)

Ligase

d)

Primase

7.
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.
8.
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
9.

DNA is located in the _____ in eukaryotic cells.

a)

nucleus

b)

cytoplasm

c)

mitochondria

d)

ribosome

10.

What is the backbone of DNA made of?

a)

sugar and phosphate

b)

nitrogen bases

c)

sugar and nitrogen bases

d)

phosphate and nitrogen bases

11.

The shape of DNA is arranged as:

a)

a double helix

b)

one strand of nucleotides

c)

squiggly lines

d)

a single nucleotide

12.

What are the correct base pair rules in DNA?

a)

A-T and C-G

b)

A-C and T-G

c)

A-G and C-T

d)

A-A, C-C, G-G, and T-T

13.

How is everyone's DNA different if there are only 4 bases in DNA?

a)

the base are arranged differently in each person

b)

each person has 4 different bases

c)

DNA is NOT different, everyone's is the same

d)

I don't know :(

14.

Why does DNA replicate?

a)

It likes to have a friend around

b)

It needs to have multiple copies of DNA molecules in each cell

c)

It needs to make a copy before the cell divides so each cell has the complete DNA

d)

to make proteins

15.

A gene is...

a)

A segment of DNA with the information necessary to synthesize a protein

b)

A segment of DNA with the information necessary to synthesize carbohydrates

c)

A long chromosome

d)

A segment of DNA that carries out DNA replication

16.

The number of human chromosomes is

a)

23

b)

46

c)

92

d)

64

17.
A single piece of coiled DNA found in the cells; contains genes that encode traits.
a)

gene

b)

chromosome

c)

trait

d)

DNA

18.

What is the relationship between DNA and chromosomes? (The image will help you out!)

a)

Chromosomes are made of DNA

b)

DNA is made of chromosomes

c)

DNA and chromosomes are the same thing.

d)

All of the above are correct

19.
Why are your chromosomes arranged in pairs?
a)

Scientists have no idea

b)

Because you get one from your mom and one from your dad

c)

Because pairs can divide easier

d)

Because DNA is awesome

20.

Adenine pairs with:

a)

Cytosine

b)

Thymine

c)

Guanine

d)

Uracil

21.

Guanine pairs with:

a)

Adenine

b)

Cytosine

c)

Thymine

d)

Uracil

22.
The sugar in DNA is ?
a)

sucrose

b)

glucose

c)

deoxyribose

d)

fructose

23.
Nitrogenous bases are joined by which type of bond?
a)

polar bonds

b)

ionic bonds

c)

covalent bonds

d)

hydrogen bonds

24.

Why does DNA stay in the nucleus?

a)

To protect it from becoming damaged.

b)

It is lazy. 

c)

It is grounded. 

d)

It cannot move. 

25.

The DNA Replication diagram is incomplete. Which nucleotide sequence accurately shows the DNA strand that would be produced during DNA replication?

a)

AGGT

b)

ACCT

c)

TAAC

d)

GCCT

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