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7th QUIZ 5.4  DNA

Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 1. 
What determines the genetic code?
a.
the order and sequence of nitrogen bases in the DNA molecule.
b.
the amount of nitrogen bases in a DNA molecule
c.
the order of amino acids in a protein
 

 2. 
The order of the bases along a DNA gene determines the order in which
a.
sugars are put together to form a carbohydrate.
b.
phosphates are arranged in DNA.
c.
amino acids are put together to form a protein.
 

 3. 
What does messenger RNA do during protein synthesis?
a.
copies the message from the DNA and carries it out of the nucleus and into the cytoplasm
b.
copies the coded message from the DNA and carries it into the nucleus.
c.
transfers amino acids and adds them to the growing protein
 

 4. 
What do transfer RNA molecules do during protein synthesis?
a.
copy the coded message from the protein and carry it into the nucleus
b.
copy the coded message from the DNA and carry it into the nucleus
c.
transfer amino acids and add them to the growing protein
 

 5. 
Where in the cell does protein synthesis take place?
a.
in the nucleus of the cell
b.
on the ribosomes in the cytoplasm of the cell
c.
in the chromosomes in the nucleus of the cell
 

 6. 
Which nitrogen base in RNA is NOT part of DNA?
a.
adenine
b.
guanine
c.
cytosine
d.
uracil
 

 7. 
What is a mutation?
a.
any change that is harmful to an organism
b.
any change in a DNA gene or chromosome
c.
any change that is helpful to an organism
 

 8. 
In order to carry out a function a cell must produce
a.
oxygen
c.
sugar
b.
proteins
 

 9. 
Which type of RNA carries the message from the nucleus into the cytoplasm of a cell?
a.
messenger RNA
c.
mutated RNA
b.
transfer RNA
 

 10. 
Which type of RNA transports the amino acids to a growing protein chain?
a.
messenger RNA
c.
mutated RNA
b.
transfer RNA
 

 11. 
How is a messenger RNA formed?
a.
Ribosomes produce mRNA
c.
mRNA comes from tRNA
b.
mRNA is replicated from DNA
 

 12. 
How many nitrogen bases do transfer RNA contain?
a.
one
c.
three
b.
two
 

 13. 
If a transfer RNA has the nitrogen bases in the order of AGC, then the exact place on the messenger RNA that it will match up to will have the nitrogen bases in the order of
a.
UCG
c.
CAT
b.
TGC
 

 14. 
DNA is found in the
a.
cytoplasm of a cell
c.
nucleus of a cell
b.
cell membrane
 

 15. 
DNA is a very
a.
short molecule
c.
dangerous substance
b.
long molecule
 

 16. 
In order to extract DNA you would need to collect
a.
cells from only plants.
c.
cells from any living thing.
b.
cells frrom only animals.
 

 17. 
The sides of the DNA double helix molecule are made of
a.
nitrogen bases
c.
protein
b.
alternating sugar and phosphates
 

 18. 
Why do hormones cause changes only in specific body organs?
a.
A hormone is carried to a specific location by tiny tubes.
b.
A hormone interacts only with target cells, which fit together with that hormone.
c.
A hormone is produced only in the location where it is needed.
 

 19. 
The endocrine system acts on the body through chemical proteins called
a.
hormones.
b.
blood and saliva.
c.
sugars.
d.
target cells.
 

 20. 
The endocrine system produces chemicals that
a.
control both daily activities and long-term changes of the body.
b.
travel to every organ in the body and cause effects to each organ
c.
begin to function only after age 13.
 

 21. 
The way the endocrine system uses a negative feedback process to maintain homeostasis is much like a...
a.
violent thunderstorm that startles people and increases their heartbeat.
b.
heating system that turns a furnace on and off to control a room’s temperature.
c.
monthly cycle of the moon
 

 22. 
Which of the following is an example of negative feedback in the endocrine system?
a.
When the amount of a hormone continually rises.
b.
When the amount of a hormone reaches a certain level, the endocrine system stops the release of that hormone.
c.
When people are startled by a frightening event, their heart beats faster.
 



 
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