Top 2 - Organisation

Question 1

What is a tissue?

Answer 1

A tissue is a group of similar cells that work together to carry out a particular function.

Question 2

Explain what is meant by the term ‘organ system’

Answer 2

An organ system is a group of organs working together.

Question 3

Why can enzymes be described as biological catalysts?

Answer 3

Enzymes reduce the need for high temperatures and we only have enzymes to speed up the useful chemical reactions in the body.

Question 4

What does it mean when an enzyme is ‘denatured’?

Answer 4

This is the changing of the shape of the active site in the enzyme, so the substrate won’t fit anymore.

Question 5

What is amylase?

Answer 5

An enzyme, found in saliva and pancreatic fluid, that converts starch and glycogen into simple sugars.

Question 6

List three place where amylase is made in the human body.

Answer 6

Pancreas
Salivary Glands
Small intestine

Question 7

What is the role of lipase’s?

Answer 7

They break down Glycerol and Fatty Acids

Question 8

Where is bile stored?

Answer 8

Gall Bladder

Question 9

Name the solution you use to test for the presence of lipids in a food sample.

Answer 9

Sudan 3 stain solution

Question 10

What colour will the iodine go in the 2cm³ food solution

when starch is present?

Answer 10

Bluey-Black

Question 11

How do you test for sugars?

Answer 11

Get your 2cm³ of food solution and add 10 drops Benedict solution and if sugar is present it will turn depending on the amount of sugar, green (little), yellow (more) and brick red (a lot).

Question 12

Name the tubes that split off from the trachea.

Answer 12

Bronchioles, then Bronchi

Question 13

Why does the heart have valves?

Answer 13

The heart has valves to prevent the back flow and blood.

Question 14

Four cambers of the heart.

Answer 14

Right Atrium, Right Ventricle, Left Atrium, Left Ventricle.

Question 15

How does your hearts PaceMaker work?

Answer 15

A group of cells in the right atrium wall act as the PaceMaker and send out small electrical impulses which the spread to the surrounding muscle cells and makes them contract.

Question 16

Why do red blood cells not have a nucleus?

Answer 16

RBC do not have a nucleus because it is unnecessary and they need as much room inside them as they can for haemoglobin and therefore oxygen.

Question 17

What is a statin and what is an advantage of them?

Answer 17

A statin is a drug that can reduce the amount of ‘bad’ cholesterol present in the bloodstream. They will slow down fat deposits forming.

Question 18

Give an example of where different type of diseases might interact in the body.

Answer 18

In the bloodstream.

Question 19

List the tissues that make up a leaf.

Answer 19

Epidermal Tissue
Palisade Mesophyll
Spongy Mesophyll 
Xylem 
Phloem
Meristem Tissue

Question 20

Function of Xylem and Phloem

Answer 20

Phloem = Food
Xylem = Water

Question 21

Define Transpiration

Answer 21

The passage of water through a plant from the roots through the system of a plant into to the atmosphere.

Question 22

What four things effect Transpiration?

Answer 22

Light intensity
CO2 levels in atmosphere around plant
Temperature
Humidity

Question 23

How do you measure the rate of Transpiration?

Answer 23

Chop half of the stem of a plant at a 45° angle and leave in water beaker to count the bubbles produced from the stem for 5 mins recording the number at 1 min intervals, with a light directed at the beaker.