Revision Worksheet Notes Flashcards

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1
Q

What is binary fission

A

Involves division of the parent body in two, fairly equal, parts to produce two identical cells. It is a form of asexual reproduction.

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2
Q

Explain why the formation of the cross wall is important in binary fission.

A

It separates the parent and daughter cell into two identical cells.

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3
Q

Explain the term generation time

A

The time it takes for a population of bacteria to double in number,

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4
Q

Outline what occurs in interphase?

A

The cell grows,
carries out its normal activities,
replicates its DNA,
prepares for cell division.

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5
Q

Outline what occurs in mitosis

A

The nucleus of the cell divides in two

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6
Q

Outline what occurs in cytokinesis

A

Cytoplasm divides and two new daughter cells are produced.

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7
Q

What is the purpose of mitosis?

A

To ensure that the two daughter cells inherit an equal and identical complement of chromosomes.

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8
Q

What must occur before mitosis takes place?

A

Interphase

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9
Q

What is the purpose of the spindle fibers?

A

To equally divide the chromosomes

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10
Q

Where do spindle fibers originate?

A

Centrosomes

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11
Q

Summarize what happens in prophase.

A
  • Chromosome condenses
  • Nucleolus disappears
  • Nuclear envelope breaks down
  • Chromosomes are released
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12
Q

Summarize what happens in metaphase.

A
  • Chromosomes continue to be condensed
  • Nucleus disappears
  • Chromosomes align in the center of the dividing cell
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13
Q

Summarize what happens in anaphase?

A
  • Sister chromatids separate from each other
  • Chromatids are pulled to opposite ends of the cell
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14
Q

What happens during telophase?

A
  • Chromosomes begin to uncoil
  • Nuclear membrane forms around each set of chromosomes
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15
Q

What is the purpose of cytokinesis?

A

To physically separate a mother cell into two daughter cell

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16
Q

Describe the differences between cytokinesis in an animal and a plant cell

A

In plants, a cell wall forms in between the daughter cells. In animals, cleavage furrow forms which pinches the cell in half.

17
Q

What is the mitotic index

A

Number of cells in mitosis/total number of cells

18
Q

Briefly describe what happens in each of the following phrases: G1

A

Cells accomplish most of their growth. They get bigger in size, and make proteins and organelles.

19
Q

Briefly describe what happens in each of the following phrases: G2

A

The cell grows more, makes proteins and organelles, prepares for mitosis

20
Q

Briefly, what happens in the M phase?

A

Nuclear division, cytoplasmic division

21
Q

Briefly, what happens in the S phase?

A

The cell synthesizes a complete copy of the DNA in its nucleus

22
Q

What are the three reasons cells divide?

A

For the survival and growth of organisms

Maintaining chromosome numbers

Damaged cells are renewed