Chapter 1 - Cells Flashcards

1
Q

Name a difference between an animal and a plant cell:

A

Plant cell has: chloroplasts/vacuole/cell wall

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Name two specialised cells and two of their adaptions

A

Sperm cell - Acrosome contains enzymes so the tail can move faster
Root hair cell - Increases surface area so that there’s more space for plants to absorb nutrients
Cilia cell - Has tiny hairs to move dust and mucus from the lungs

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What is a tissue?

A

A group of similar cells that perform a specialised function

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What is an organ?

A

A part of the body with a specialised function.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What is the organ system?

A

A group of organs that work together to perform a function.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Define ‘diffusion’

A

The random NET movement of particles from a high to low concentration.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

How is diffusion increased?

A

Stirring
Heat
Surface Area

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

How is diffusion slowed down?

A
  • Lower temperature
  • More area to diffuse
  • Smaller concentration gradient
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

How does diffusion of O2 occur in breathing?

A

In the alveoli.
O2 has low concentration in the blood and high concentration in the airspace.
It diffuses from high to low (into the blood)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Define ‘organelle’

A

The structures within a cell

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What is the endocrine system for?

A

The production of hormones.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Where conditions allow for faster diffusion?

A
  • Large surface area
  • Large blood supply
  • Thin cell
  • Small distance = faster diffustion
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

How does diffusion occur in nerve cells?

A
  • (electrical) impulse is converted into a chemical signal (at the synapse)
  • Neurotransmitter released from one neurone into a synapse
  • they diffuse across the gap, towards the next neurone’s receptors
  • moving from a high concentration to low concentration
  • binding converts the chemical signal to an (electrical) impulse
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

How does diffusion occur in digestion?

A
  • breaks down large food molecules into smaller SOLUBLE molecules (e.g. glucose, amino acids, and fatty acids easily absorbed)
  • diffuse across intestine wall into bloodstream
  • Small intestines have villi
  • Villi: increase SA (surface area) of small intestines = more substances absorbed through diffusion
  • Villi have lots of capillary= good blood supply. molecules go straight to bloodstream (when diffused)
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What are the adaptations of a root hair cell?

A
  • Increases surface area of root

- No chloroplasts

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What are the adaptations of a palisade cell?

A
  • Packed with chloroplasts for photosynthesis

- At the top of the leaf

17
Q

What are the adaptations of a sperm cell?

A
  • Vacuole has enzymes to break the surface of the egg cell
  • Nucleus has half of the father’s chromosomes
  • Has a filament (tail) for movement
  • Contains a large number of mitochondria for energy release
18
Q

What happens when a plant doesn’t get enough water?

A

Because the vacuole shrinks, the plant shrivels and wilts. The cell wall separates from the cell membrane. This is called PLASMOLYSIS

19
Q

Name a similarity between an animal cell and a plant cell.

A

-both have a cell membrane/cytoplasm/ribsomes/mitchondria/nucleus

20
Q

Give two differences between an animal cell and the cell of a bacterium.

A
  • Bacterium has a flagellum to help it move

- Animal cells have a nucleus

21
Q

Why do sperms need many mitochondria?

A

Sperm cells need a lot of energy to swim

22
Q

What is the main job of a leaf mesophyll cell?

A

Allows photosynthesis to take place

23
Q

Explain one way in which the structure of the leaf mesophyll cell helps is to carry out its job

A

It has a large surface area so it can more sunlight. Photosynthesis can happen faster

24
Q

What is the function of the nucleus?

A

nucleus - controls activity of the cell. contains DNA

25
What is the function of the cell membrane?
cell membrane - controls what goes in and out of the cell
26
What is the function of the chloroplasts?
chloroplasts - responsible for the process of photosynthesis
27
What is the function of the cell wall?
cell wall - cell structure
28
How does diffusion of CO2 occur in breathing?
In the alveoli. CO2 has high concentration in the blood and low concentration in the airspace. It diffuses from high to low (into the airspace)
29
What is the function of the mitochondria?
mitochondria - releases energy through respiration
30
What is the function of the cytoplasm?
cytoplasm - where chemical reactions take place
31
What is the function of the cell wall?
cell wall - cell structure
32
How does diffusion of CO2 occur in breathing?
In the alveoli. CO2 has high concentration in the blood and low concentration in the airspace. It diffuses from high to low (into the airspace)
33
What happens to an animal cell in a hypertonic solution?
it shrivels
34
What happens to an animal cell in a hypotonic solution?
lysis (bursts)
35
What happens to an plant cell in a hypertonic solution?
plasmolysis (cell membrane separates from cell wall)