Download CANCER Section 8.3 Summary – pages 211

Control of Cell Cycle
• Occasionally , cells lose control of the cell cycle.
• Cancer is a growth resulting from uncontrolled
cell division.
• This loss of control may be caused by environmental
factors or certain inheritances.
Control of Cell Cycle
• There are enzymes (proteins) that control the rate of
the cell’s life cycle.
• Scientists believe that if something goes wrong with
these enzymes, they cause cells to skip a long
interphase and divide a lot faster than they should.
CANCER
• A bunch of cancer cells together form masses of
tissue called tumors that deprive normal cells of
nutrients.
CANCER
• The causes of cancer are difficult to pinpoint because
both genetic and environmental factors are involved.
• Cancer may also be caused by viral infections that
damage the genes.
DNA , Viruses, and Cell Cycle
Review Game
ROUND 1 – 5 POINTS EACH
ROUND 2 – 10 POINTS EACH
ROUND 3 - 15 POINTS EACH
1. What is the structure below?
1. What is the structure below?
Nucleotide- a subunit of a nucleic acid
2. Label the parts of this DNA nucleotide.
1.
3.
2.
2. Label the parts of this DNA nucleotide.
1. Phosphate group
3. Nitrogenous
base
2. sugar
3. A cell contains 27 chromosomes. It goes through
mitosis. How many chromosomes does the new
daughter cell contain?
3. A cell contains 27 chromosomes. It goes through
mitosis. How many chromosomes does the new
daughter cell contain?
27
4.
What does a pyrimidine always bond with?
4.
What does a pyrimidine always bond with?
A purine
5. During what stage of the cell cycle does the
below process occur?
5. During what stage of the cell cycle does the
below process occur?
INTERPHASE
ROUND 2
1. Below are the pictures of the four phases
of mitosis. Name them and put them in order
of occurrence.
A.
B.
C.
D.
1. Below are the pictures of the four phases
of mitosis. Name them and put them in order
of occurrence.
D. prophase
B. metaphase
A. anaphase
C. telophase
2.
What do the dotted lines represent?
2.
What do the dotted lines represent?
Hydrogen Bonds
3. During what phase of nuclear division does
chromatin coil up into chromosomes?
3. During what phase of nuclear division does
chromatin coil up into chromosomes?
Prophase
4. HIV and chicken pox are viruses that
integrate their nucleic acids into the DNA of their
host cell. What is their replication cycle called?
4. HIV and chicken pox are viruses that
integrate their nucleic acids into the DNA of their
host cell. What is their replication cycle called?
Lysogenic
5. Why can’t HIV attack red blood cells or other
types of white blood cells (like B cells)?
5. Why can’t HIV attack red blood cells or other
types of white blood cells (like B cells)?
It must fit like a puzzle piece into the
receptor site of a particular cell- so it
can only attack Helper T’s
What is the bursting of a cell called?
(It happens when virus leave a host cell)
What is the bursting of a cell called?
(It happens when virus leave a host cell)
Lysis
ROUND 3
1. Match the explanation of what is happening
with each stage of the virus lytic cycle.
1. ____ Lysis
2. ____ Viral DNA is taking over Host cell’s DNA
3. ____ Virus attaches to cell’s receptor site
4. ____ The cell is forced to make virus copies
5. ____ The virus injects it’s DNA into the host cell
1. Match the explanation of what is happening
with each stage of the virus lytic cycle.
E Lysis
1. ____
C Viral DNA is taking over Host cell’s DNA
2. ____
3. ____
A Virus attaches to cell’s receptor site
4. ____
D The cell is forced to make virus copies
B The virus injects it’s DNA into the host cell
5. ____
2. a. What is the process shown below?
b. What is the end result of this process?
c. What is significant about the blue and pink
lines?
Original DNA
Parental DNA
New DNA
2. a. What is the process shown below?
DNA Replication
b. What is the end result of this process?
2 Identical DNA strands
c. What is significant about the blue and pink
lines?
one strand in the new dnas will be from the original, one will be newly
formed from free nucleotides
Original DNA
Parental DNA
New DNA
3.
Hydrogen bonds are to nitrogenous bases…
A. as, Covalent bonds are to Adenine and Thymine
B. as, Hydrogen bonds are to Phosphates and Sugar
C. as, Peptide bonds are to DNA
D. as, Covalent bonds are to Phosphates and Sugars
3.
Hydrogen bonds are to nitrogenous bases…
A. as, Covalent bonds are to Adenine and Thymine
B. as, Hydrogen bonds are to Phosphates and Sugar
C. as, Peptide bonds are to DNA
D. as, Covalent bonds are to Phosphates and Sugars
4. Give two reasons why cells need to divide to
make new cells.
4. Give two reasons why cells need to divide to
make new cells.
Repair, Replace Dead, Growth
5. What three things occur during Interphase?
5. What three things occur during Interphase?
Growth, Organelle duplication,
DNA replication