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Bio 6A/C - DNA Components and Changes/Mutations (Part I - Ch. 6 HOLT Biology)

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

 1. 
In a bacterium, cell division takes place when
a.
its nucleus divides.
b.
the cell splits into two cells, one of which receives all of the DNA.
c.
the DNA is copied, a new cell wall forms between the DNA copies, and the cell splits into two cells.
d.
None of the above
 

 2. 
Chromatids are
a.
dense patches within the nucleus.
b.
bacterial chromosomes.
c.
joined strands of duplicated genetic material.
d.
prokaryotic nuclei.
 

 3. 
The chromosomes in your body
a.
exist in 23 pairs in all cells but gametes.
b.
each contain thousands of genes.
c.
form right before cells divide.
d.
All of the above
 

 4. 
In order to fit within a cell, DNA becomes more compact by
a.
breaking apart into separate genes.
b.
extending to form very long, thin molecules.
c.
wrapping tightly around associated proteins.
d.
being enzymatically changed into a protein.
 

 5. 
Normal human males develop from fertilized eggs containing which of the following sex chromosome combinations?
a.
XY
c.
XO
b.
XX
d.
OO
 

 6. 
The X and Y chromosomes are called the
a.
extra chromosomes.
c.
sex chromosomes.
b.
phenotypes.
d.
All of the above
 

 7. 
How many chromosomes are in the body cells of an organism that has a haploid number of 8?
a.
4
c.
12
b.
8
d.
16
 

 8. 
diploid : somatic cell :: haploid :
a.
body cell
c.
gamete
b.
chromosome
d.
zygote
 

 9. 
If nondisjunction occurs,
a.
there will be too many gametes produced.
b.
no gametes will be produced.
c.
a gamete will receive too many or too few homologues of a chromosome.
d.
mitosis cannot take place.
 

 10. 
A mutation caused by a piece of DNA breaking away from its chromosome and becoming attached to a nonhomologous chromosome is called
a.
deletion.
c.
inversion.
b.
duplication.
d.
translocation.
 

 11. 
Trisomy is a mutation that results in a cell having an extra
a.
nitrogen base.
c.
chromosome.
b.
codon.
d.
gene.
 

 12. 
metaphase : prophase ::
a.
G1 : M
c.
M : C
b.
G2 : S
d.
autotroph : producer
 

 13. 
Normal cells become cancer cells when
a.
regulation of cell growth and division is lost.
b.
cells do not respond normally to control mechanisms.
c.
cells continue to divide without passing through G1.
d.
All of the above
 

 14. 
A spindle fiber is a specialized form of
a.
microtubule.
c.
cilium.
b.
flagellum.
d.
chromosome.
 
 
bio6a_intvn02_files/i0160000.jpg
 

 15. 
Refer to the illustration above. Mitosis begins with the stage shown in diagram
a.
1.
c.
3.
b.
2.
d.
4.
 

 16. 
Refer to the illustration above. The cell shown in diagram 5 is in
a.
metaphase.
c.
anaphase.
b.
telophase.
d.
prophase.
 
 
bio6a_intvn02_files/i0190000.jpg
 

 17. 
Refer to the illustration above. Which of the following correctly indicates the order in which these events occur?
a.
A, B, C, D
c.
B, A, C, D
b.
C, B, A, D
d.
A, C, B, D
 

 18. 
Refer to the illustration above. During which stage do the centromeres divide?
a.
A
c.
C
b.
B
d.
D
 

 19. 
Cytokinesis in plant cells involves the formation of
a.
replicated chromosomes.
c.
spindle fibers.
b.
a cell plate.
d.
centrioles.
 

 20. 
Which of the following statements is true?
a.
Prokaryotes divide by mitosis.
b.
Eukaryotes have circular chromosomes.
c.
Animal cells form new cell walls when they divide.
d.
Plant cells and animal cells have different strategies for cytokinesis.
 



 
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