AQA GCSE BIOLOGY 2024 NEWEST 200+
DETAILED QUESTIONS AND GUARANTEED
ANSWERS ALREADY GRADED A+.
Why is it important that bile neutralises the hydrochloric acid? - ANSWER- Because the
enzymes in the small intestine work best in alkaline conditions
"Bile emulsifies fats" what does this mean? - ANSWER- - it breaks down fats into tiny
droplets
- this gives a much bigger surface area of fat for the enzyme lipase to work on
- making digestion faster
What enzyme is produced in the stomach? - ANSWER- protease enzyme, pepsin
Which enzymes are produced in the pancreas? - ANSWER- - amylase
- protease
- lipase
Which enzymes are produced in the small intestine? - ANSWER- - amylase
- protease
- lipase
What is respiration? - ANSWER- The process of releasing energy from the breakdown
of glucose - it goes on in every cell of the body
,What is aerobic respiration? - ANSWER- respiration using oxygen - most efficient way
to release energy from glucose
Where does most of the reactions in aerobic respiration happen? - ANSWER- inside the
mitochondria and are controlled by enzymes
What is the word equation for aerobic respiration? - ANSWER- glucose + oxygen ----->
carbon dioxide + water + energy
In which type of cell would you find a cell wall, chloroplasts and a vacuole? - ANSWER-
plant cell
What does an animal cell have? - ANSWER- - cytoplasm
- nucleus
- ribosomes
- cell membrane
- mitochondria
What does the nucleus do? - ANSWER- contains genetic material that controls the
activities of the cell
,What is the cytoplasm? - ANSWER- gel-like substance where most of the chemical
reactions happen. It contains enzymes which control these chemical reactions
What is the cell membrane - ANSWER- holds the cell together and controls what goes
in and out
What happens in the mitochondria? - ANSWER- these are where most of the reactions
for respiration take place. Respiration releases energy that the cell needs to work
What happens in the ribosomes? - ANSWER- these are where proteins are made in the
cell
What does a bacterial cell NOT have? - ANSWER- a nucleus- genetic material floats in
the cytoplasm
What is a yeast cell an example of? - ANSWER- a single cell organism
What does a yeast cell have? - ANSWER- - nucleus
- cytoplasm
- cell membrane
- surrounding cell wall
, How is a leaf cell different from a yeast cell? - ANSWER- leaf cells have chloroplasts
and a cellulose cell wall. yeast cells have neither
What is the definition of diffusion? - ANSWER- the SPREADING OUT of PARTICLES
from an area of HIGH CONCENTRATION to an area of LOW CONCENTRATION
or
the NET MOVEMENT of PARTICLES down a CONCENTRATION GRADIENT
What substances can diffuse through cell membranes? - ANSWER- small molecules
like oxygen, glucose, amino acids and water
What substances can't diffuse through cell membranes? - ANSWER- big molecules like
starch and proteins
What are some examples of diffusion? - ANSWER- - the diffusion of oxygen into the
cells of the body from the bloodstream as the cells are respiring (and using up oxygen)
- the diffusion of carbon dioxide into actively photosynthesising plant cells
- the diffusion of simple sugars and amino acids for the gut through cell membranes
DETAILED QUESTIONS AND GUARANTEED
ANSWERS ALREADY GRADED A+.
Why is it important that bile neutralises the hydrochloric acid? - ANSWER- Because the
enzymes in the small intestine work best in alkaline conditions
"Bile emulsifies fats" what does this mean? - ANSWER- - it breaks down fats into tiny
droplets
- this gives a much bigger surface area of fat for the enzyme lipase to work on
- making digestion faster
What enzyme is produced in the stomach? - ANSWER- protease enzyme, pepsin
Which enzymes are produced in the pancreas? - ANSWER- - amylase
- protease
- lipase
Which enzymes are produced in the small intestine? - ANSWER- - amylase
- protease
- lipase
What is respiration? - ANSWER- The process of releasing energy from the breakdown
of glucose - it goes on in every cell of the body
,What is aerobic respiration? - ANSWER- respiration using oxygen - most efficient way
to release energy from glucose
Where does most of the reactions in aerobic respiration happen? - ANSWER- inside the
mitochondria and are controlled by enzymes
What is the word equation for aerobic respiration? - ANSWER- glucose + oxygen ----->
carbon dioxide + water + energy
In which type of cell would you find a cell wall, chloroplasts and a vacuole? - ANSWER-
plant cell
What does an animal cell have? - ANSWER- - cytoplasm
- nucleus
- ribosomes
- cell membrane
- mitochondria
What does the nucleus do? - ANSWER- contains genetic material that controls the
activities of the cell
,What is the cytoplasm? - ANSWER- gel-like substance where most of the chemical
reactions happen. It contains enzymes which control these chemical reactions
What is the cell membrane - ANSWER- holds the cell together and controls what goes
in and out
What happens in the mitochondria? - ANSWER- these are where most of the reactions
for respiration take place. Respiration releases energy that the cell needs to work
What happens in the ribosomes? - ANSWER- these are where proteins are made in the
cell
What does a bacterial cell NOT have? - ANSWER- a nucleus- genetic material floats in
the cytoplasm
What is a yeast cell an example of? - ANSWER- a single cell organism
What does a yeast cell have? - ANSWER- - nucleus
- cytoplasm
- cell membrane
- surrounding cell wall
, How is a leaf cell different from a yeast cell? - ANSWER- leaf cells have chloroplasts
and a cellulose cell wall. yeast cells have neither
What is the definition of diffusion? - ANSWER- the SPREADING OUT of PARTICLES
from an area of HIGH CONCENTRATION to an area of LOW CONCENTRATION
or
the NET MOVEMENT of PARTICLES down a CONCENTRATION GRADIENT
What substances can diffuse through cell membranes? - ANSWER- small molecules
like oxygen, glucose, amino acids and water
What substances can't diffuse through cell membranes? - ANSWER- big molecules like
starch and proteins
What are some examples of diffusion? - ANSWER- - the diffusion of oxygen into the
cells of the body from the bloodstream as the cells are respiring (and using up oxygen)
- the diffusion of carbon dioxide into actively photosynthesising plant cells
- the diffusion of simple sugars and amino acids for the gut through cell membranes
