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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. 
Binary fission
a.
occurs when two cells collide with each other.
b.
produces excess energy.
c.
creates new species.
d.
is the process by which bacteria reproduce.
 

 2. 
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
 

 3. 
Chromatids are
a.
dense patches within the nucleus.
b.
bacterial chromosomes.
c.
joined strands of duplicated genetic material.
d.
prokaryotic nuclei.
 

 4. 
When a molecule of DNA is being used to direct a cell’s activities,
a.
areas containing specific active genes are extended.
b.
the areas of the molecule containing active genes become shorter.
c.
the entire DNA molecule becomes tightly coiled.
d.
the molecule becomes a rod-shaped structure with two chromatids.
 

 5. 
Homologous chromosomes are pairs of chromosomes containing genes that code for
a.
different traits.
c.
DNA.
b.
the same traits.
d.
cytosol.
 

 6. 
In humans, gametes contain
a.
22 autosomes and 1 sex chromosome.
b.
1 autosome and 22 sex chromosomes.
c.
45 autosomes and 1 sex chromosome.
d.
1 autosome and 45 sex chromosomes.
 

 7. 
The diploid number of chromosomes in a human skin cell is 46. The number of chromosomes found in a human ovum is
a.
46.
c.
23.
b.
92.
d.
12.5.
 

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

 9. 
A diploid cell is one that
a.
has two homologues of each chromosome.
b.
is designated by the symbol 2n.
c.
has chromosomes found in pairs.
d.
All of the above
 

 10. 
A student can study a karyotype to learn about the
a.
cell cycle.
b.
genes that are present in a particular strand of DNA.
c.
medical history of an individual.
d.
number and structure of the chromosomes in a somatic cell.
 

 11. 
The synthesis (S) phase is characterized by
a.
DNA replication.
b.
cell division.
c.
replication of mitochondria and other organelles.
d.
the division of cytoplasm.
 

 12. 
Mitosis is the process by which
a.
microtubules are assembled.
b.
cytoplasm is divided.
c.
the nucleus is divided into two nuclei.
d.
the cell rests.
 

 13. 
The cell cycle is monitored as each cell passes through
a.
cellular respiration.
c.
photosynthesis.
b.
checkpoints.
d.
homeostasis.
 

 14. 
As a result of mitosis, each of the two new cells produced from the parent cell during cytokinesis
a.
receives a few chromosomes from the parent cell.
b.
receives an exact copy of all the chromosomes present in the parent cell.
c.
donates a chromosome to the parent cell.
d.
receives exactly half the chromosomes from the parent cell.
 
 
bio6a_intvn08_files/i0160000.jpg
 

 15. 
Refer to the illustration above. The cell in diagram 1 is in
a.
metaphase.
c.
anaphase.
b.
telophase.
d.
prophase.
 

 16. 
Refer to the illustration above. Mitosis begins with the stage shown in diagram
a.
1.
c.
3.
b.
2.
d.
4.
 

 17. 
Refer to the illustration above. The cell shown in diagram 5 is in
a.
metaphase.
c.
anaphase.
b.
telophase.
d.
prophase.
 
 
bio6a_intvn08_files/i0200000.jpg
 

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

 19. 
5 steps: the cell cycle ::
a.
6 steps : prophase
c.
3 steps : meiosis
b.
9 steps : cytokinesis
d.
4 steps : mitosis
 

 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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