Unit One - Cell Biology Flashcards Preview

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Flashcards in Unit One - Cell Biology Deck (23)
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1

Some microscopic living things consist of only one cell. What are these called ?

They are called unicellular or single celled

2

What is the name for unicellular organisms that have the characteristics of animal cells

They are called protozoans

3

A group of similar cells working together and carrying out a specific function are known as a _______?

Tissue

4

A group of different tissues make up an ________?

Organ

5

A group of related tissues and organs make up a ___________?

System e.g. Digestive system

6

What function do the palisade mesophyll cells have ?

It is the primary region of light absorption and photosynthesis

7

The shape of the spongy mesophyll cells aid their function, describe this shape and function.

Their round shape allows loose arrangement in contact with moist air spaces for absorption of CO2

8

Xylem are described as 'dead hollow tubes' how does this allow them to carry out their job

This allows them to carry out their job because it allows water to flow freely

9

Xylem vessels contain lignin, what is the function of lignin ?

Lignin strengthens the xylem vessels walls

10

What is the function of the phloem ?

Transport of soluble carbohydrates

11

Another cell is associated with the phloem cell, what is it and what does it do?

Another cell associated with the phloem cell is the companion cell and it controls the sieve tube

12

What is the function of a Red Blood Cell ?

It uptakes and transports of oxygen to living cells

13

How does the shape of the Red Blood Cell aid its function?

The shape allows it to have a large surface area

14

Describe the structure of he ciliates epithelium tissue.

It sweeps dirty mucus up and away from the lungs

15

What is diffusion

Diffusion is the movement of molecules or ions from a region of high concentration to a region of low concentration of that molecule along a concentration gradient, until evenly spread.

16

What is osmosis ?

Osmosis is the movement of water molecules from a region of High Water Concentration to a region of Low Water Concentration along a concentration gradient, through a selectively permeable membrane

17

If a solution is of a higher water concentration than the cell it is said to be what?

Hypotonic

18

If a solution is of a lower water concentration than the cell it is said to be what?

Hypertonic

19

When the solution and cell concentration are equal it is said to be what?

Isotonic

20

A phospholipid Bilayer is often referred to a what?

A Fluid Mosaic Model

21

Proteins on the phospholipid Bilayer have other functions such as

- support
- channels for transport of molecules
- carriers e.g. Sodium/potassium pump
- enzymes
- receptors for hormones

22

What is active transport ?

Active transport is the movement of molecules or ions from a low concentration to a high concentration against a concentration gradient through a plasma cell membrane. This process requires energy

23

What are cells ?

Cells are the basic units that make up nearly all living things