Lipids - 3.5 - (5)

Question 1

How can lipids be identified in the laboratory?

Answer 1

by the emulsion test

Question 2

Emulsion test - What occurs first?

Answer 2

the sample is mixed with ethanol

Question 3

Emulsion test - What happens to the resulting solution?

Answer 3

it is then mixed with water and shaken

Question 4

Emulsion test - If a white emulsion forms as a layer on top of the solution, what does this indicate?

Answer 4

this indicates the presence of a lipid

Question 5

Emulsion test - If the solution remains clear, what does this show?

Answer 5

that the test is negative and the absence of the lipid

Question 6

What is constantly changing?

Answer 6

health advice

Question 7

Why is it that health advice can be confusing?

Answer 7

because the way that new advice is issued in the media from new research

Question 8

What has not usually been evaluated?

Answer 8

the validity of the research and the science is also not easy to explain

Question 9

As majority of the general public do not have scientific backgrounds, what are they not aware of?

Answer 9

the nature of scientific understanding

Question 10

What is constantly changing and why?

Answer 10

scientific knowledge as technology develops so our understanding of biological processes increases

Question 11

What is it difficult to isolate the effect of?

Answer 11

of just one nutrient and it is now believed that nutrients don’t work in isolation but as part of the combined effect of a whole range of nutrients

Question 12

What is this called?

Answer 12

food synergy

Question 13

What are whole grains believed to have a greater effect than?

Answer 13

any of their individual components

Question 14

Which combination helps to prevent certain types of heart disease?

Answer 14

fish, fruit, and vegetables

Question 15

What is often flawed and why?

Answer 15

the data used in reports as the subjects involved in studies do not usually provide accurate information

Question 16

What do people tend to underestimate?

Answer 16

what they eat, they forget what they have eaten and don’t know the exact ingredients of meals, especially if they are eating out

Question 17

How are people different?

Answer 17

due to their genetic makeup and so, they respond differently to different nutrients

Question 18

What do studies that catch the headlines often involve?

Answer 18

small numbers of subjects and these inherent differences change the findings

Question 19

How are the resulting headlines?

Answer 19

they can be eye-catching, but not very accurate

Question 20

What are the studies often contradicted by?

Answer 20

the next study