Chapter Resources

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Chapter Resources
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life.msscience.com
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Foldables
Video Clips and Animations
Chapter Summary
Chapter Review Questions
Standardized Test Practice
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life.msscience.com
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Paramecium
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Cell Cycle
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Interphase
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Cell Division
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DNA
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Cell Division
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Prophase
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Metaphase
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Anaphase
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Telophase
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Mitosis Ends
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Chromosomes
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Female Cat
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Kitten
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Potato With Sprouts
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Starfish Regrowth
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Sperm and Egg
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Male Cat
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Sexual Reproduction
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Meiosis I and II
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Meiosis I
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Prophase I
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Metaphase I
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Anaphase I
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Telophase 1
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Meiosis II
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Prophase II
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Metaphase II
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Anaphase II
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Telophase II
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Diploid Cell
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DNA Chromosome
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DNA Band
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DNA Molecule
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DNA Ladder
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DNA Unzips
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Chromosome 7
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DNA Nucleus
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DNA and RNA
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Frog With Mutation
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Foldables
How and Why Cells Divide
Make the following Foldable to help you organize
information from the chapter about cell
reproduction.
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Foldables
Draw a mark at the midpoint of a vertical sheet
of paper along the side edge.
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Foldables
Turn the paper horizontally and fold the outside
edges in to touch at the midpoint mark.
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Foldables
Use a pencil to draw a cell on the front of your
Foldable as shown.
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Foldables
Analyze
As you read the chapter, write under the flaps
how cells divide. In the middle section, list
why cells divide.
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Video Clips
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Video Clips
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Video Clips
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Reviewing Main Ideas
1
Cell Division and Mitosis

• The life cycle of a cell has two partsgrowth and
  development, and cell division.

• In mitosis, the nucleus divides to form two
  identical nuclei. Mitosis occurs in four
  continuous steps, or phasesprophase, metaphase,
  anaphase, and telophase.

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Reviewing Main Ideas
1
Cell Division and Mitosis

• Cell division in animal cells and plant cells is
  similar, but plant cells do not have centrioles
  and animal cells do not form cell walls.

• Organisms use cell division to grow, to replace
  cells, and for asexual reproduction. Asexual
  reproduction produces organisms with DNA
  identical to the parents DNA. Fission, budding,
  and regeneration can be used for asexual
  reproduction.

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Reviewing Main Ideas
2
Sexual Reproduction and Meiosis

• Sexual reproduction results when an egg and sperm
  join. This event is called fertilization, and
  the cell that forms is called the zygote.

• Meiosis occurs in the reproductive organs,
  producing four haploid sex cells.

• During meiosis, two divisions of the nucleus
  occur.

• Meiosis ensures that offspring produced by
  fertilization have the same number of chromosomes
  as their parents.

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Reviewing Main Ideas
3
DNA

• DNA is a large molecule made up of two twisted
  strands of sugar-phosphate molecules and nitrogen
  bases.

• All cells contain DNA. The section of DNA on a
  chromosome that directs the making of a specific
  protein is a gene.

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Reviewing Main Ideas
3
DNA

• DNA can copy itself and is the pattern from which
  RNA is made. Messenger RNA, ribosomal RNA, and
  transfer RNA are used to make proteins.

• Permanent changes in DNA are called mutations.

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Chapter Review
Question 1
Which is NOT a phase of mitosis?
A. anaphase B. interphase C. intraphase D.
metaphase
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Chapter Review
Answer
The answer is C. There is no phase of mitosis
called intraphase.
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Chapter Review
Question 2
A hydra that reproduces by budding is an example
of _______?
A. asexual reproduction B. mitosis C.
regeneration D. sexual reproduction
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Chapter Review
Answer
The answer is A. Asexual reproduction results in
offspring that are an exact copy of the adult.
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Chapter Review
Question 3
What type of nitrogen is found in RNA, but not in
DNA.
Answer
The answer is uracil. RNA has the base uracil
instead of thymine.
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Chapter Review
Question 4
When cells have pairs of similar chromosomes,
they are said to be _______.
Answer
The answer is diploid. A typical human body cell
is diploid.
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Chapter Review
Question 5
This illustration represents what division of the
nucleus?
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Chapter Review
Answer
The answer is meiosis 1. The end result of
meiosis 1 is a pair of new cells, each with one
duplicated chromosome from each parent.
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Standardized Test Practice
Question 1
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Standardized Test Practice
A. A B. B C. C D. D
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Standardized Test Practice
Answer
The answer is C. Anaphase is the third step of
mitosis.
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Standardized Test Practice
Question 2
Which letter corresponds with telophase?
A. A B. B C. C D. D
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Standardized Test Practice
Answer
The answer is D. During telophase, spindle
fibers start to disappear, the chromosomes start
to uncoil, and a new nucleus forms.
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Standardized Test Practice
Question 3
Which is the number of chromosomes in a body cell?
A. 23 B. 36 C. 42 D. 46
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Standardized Test Practice
Answer
The answer is D. Each human body cell has 23
pairs of chromosomes, 46 chromosomes all together.
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Standardized Test Practice
Question 4
Sea stars can grow new arms. What is this an
example of?
A. asexual reproduction B. budding C.
regeneration D. sexual reproduction
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Standardized Test Practice
Answer
The answer is C. Regeneration is the process
that uses cell division to regrow body parts.
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Standardized Test Practice
Question 5
Which is the best answer?
A. The instructions for making a specific gene
are found in protein. B. Genes are found in the
cytoplasm. C. The gene determines the order of
amino acids in a protein. D. A change in the
gene does not change the outcome of an inherited
trait.
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Standardized Test Practice
Answer
The answer is C. Changing the order of the amino
acids makes a different protein.
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End of Chapter Resources File