cell bio Flashcards

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1
Q

What are the two kinds of cells?

A

Prokaryotic & eukaryotic cells

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2
Q

What does the nucleus contain?

A

DNA

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3
Q

How many pairs of cells are there in a human cell?

A

23

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4
Q

What is the process of division called in prokaryotes called?

A

Binary Fission

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5
Q

How to find the mean division time to find the number of bacteria?

A

convert the hours into minutes. Divide the total time by the mean division time. This gives you the number of divisions. Multiply 2 by itself for the number of divisions to find the number of cells

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6
Q

Where can stem cells be found in plants?

A

It can be found in the meristem

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7
Q

Where can we find an adult stem cell?

A

In the bone marrow

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8
Q

What kind of cell can an embryonic cell be turned into?

A

Any

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9
Q

One ethical issue for using embryonic stem cell

A

It could be a potential human life

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10
Q

What is the result of mitosis?

A

2 daughter cells

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11
Q

Give two uses for stem cells

A

Can cure many diseases

farmers can grow identical crops that have desired features e.g. disease resistance

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12
Q

What are chromosomes?

A

Coiled up lengths of DNA

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13
Q

What are cells?

A

Building blocks of life

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14
Q

What is diffusion?

A

The gradual movement of particles in an area of higher concentration to lower one.

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15
Q

What is osmosis?

A

The movement of water molecules across a partially permeable membrane from a region of high water concentration to a lower one.

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16
Q

Active transportation

A

Some substances need to be absorbed against a concentration gradient - from a lower to a higher concentration

17
Q

What is differentiation?

A

A process by which a cell changes to become specialised for its job e.g. red blood cell

18
Q

What is a nerve cell specialised for?

A

Rapid signalling

19
Q

What is a sperm cell specialised for?

A

Reproduction

20
Q

What are muscles cells specialised for?

A

contraction

21
Q

What is a cell cycle?

A

Growth development and repair of a cell

22
Q

What is needed in order for active transportation to take place?

A

Energy

23
Q

Where does active transportation take place?

A

In liquids and gases

e.g. small intestine and root hair cell

24
Q

Where does Osmosis take place?

A

water

25
Q

Where does diffusion take place?

A

In liquids and gases