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AQA A-level Biology paper 1 .2020. Questions And Answers.
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10/23/24, 9:58 AMAQA A-level Biology paper 1 .2020. Questions And
Answers
Terms in this set (421)
What are monomers? The smaller units from which larger molecules are made
What are polymers? Molecules made from a large number of monomers joined together
What are examples of monomers? Monosaccharides, amino acids and nucleotides
Two molecules are joined together with the formation of a chemical bond, it involves
What happens in a condensation reaction?
the elimination of a molecule of water
What happens in a hydrolysis reaction? The chemical bond between two molecules is broken, it involves the use of water
All life on earth shares a common This provides indirect evidence for evolution
chemistry ...
The cells of all living organisms contain Groups of carbon-based compounds that interact in similar ways
only a few ...
Carbohydrates are commonly used by cells They also form structural components in plasma membranes and cell walls
as respiratory substrates,
Lipids have many uses, including ... The bilayer of plasma membranes, certain hormones, and as respiratory substrates
Proteins form many cell structures, they are Enzymes, chemical messengers, and components of the blood
also important as ...
Nucleic acids carry the genetic code for ... The production of proteins
What is the most common component of Water
cells?
what happens in covalent bonding? atoms share a pair of electrons in their outer shell
What happens in ionic bonding? ions with opposite charges attract one another and form an ionic bond
the negative region of a polar molecule is attracted to the positive region of another
what happens in hydrogen bonding?
polar molecule and a weak electrostatic bond is formed between them both
what are all chemical processes that take metabolism
place in living organisms collectively
called?
what is a molar solution? a solution which contains one mole of solute in each litre of solution
AQA A-level
what are atoms? Biology paper 1 .2020.
the smallest unit of a chemical element that can exist independently
1/5
, 10/23/24, 9:58 AM
if an atom loses or receives an electron, an ion
what does it become?
What are monosaccharides? The monomers from which larger carbohydrates are made
What are examples of common Glucose, galactose, and fructose
monosaccharides?
What bond does a condensation reaction Glycosidic
between two monosaccharides form?
how are disaccharides formed? The condensation of two monosaccharides
Maltose is a disaccharide formed by Two glucose molecules
condensation of ...
Sucrose is a disaccharide formed by Glucose and fructose
condensation of ...
Lactose is a disaccharide for bed by Glucose and galactose
condensation of ...
What are glucoses isomers? Alpha glucose and beta glucose
Polysaccharides are formed by ... The condensation of many glucose units
Which polysaccharides are formed by the Glycogen and starch
condensation of alpha glucose?
Which polysaccharide is formed by the Cellulose
condensation of beta glucose?
what are all monosaccharides and some reducing sugars
disaccharides?
what is reduction? a chemical reaction involving the gain of electrons or hydrogen
what is a reducing sugar? a sugar that can donate electrons to another chemical
what is the test for reducing sugars known the benedicts test
as?
why is the test for reducing sugars known benedicts reagent is used to test reducing sugars
as the benedicts test?
1. dissolve the food sample in water
how do you carry out the benedicts test? 2. add an equal volume of benedicts reagent
3. heat in water bath
what colour will the benedicts reagent turn orange - brown
if a reducing sugar is present?
1. ensure its not a reducing sugar by carrying out the benedicts test
2. add equal volumes of food sample and hydrochloric acid to a test tube
how do you test if a sugar is non-reducing? 3. place in a water bath
4. add sodium hydrogencarbonate to neutralise the hydrochloric acid
5. complete the benedicts test with this solution
if a non-reducing sugar was present in the orange - brown
original sample of a non-reducing sugar
food test what colour will the benedicts
reagent turn?
why are polysaccharides insoluble? they are very large molecules
what features make polysaccharides insoluble
suitable for storage?
AQA A-level Biology paper 1 .2020.
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