AS Level Biology / AS Level Biology EXAM COMPLETE 2 VERSIONS WITH 214 QUESTIONS AND
CORRECT DETAILED ANSWERS (VERIFIED ANSWERS) |ALREADY GRADED A+
Activation Energy - correct answer The energy that needs to be supplied before a chemical
reaction will start
Active site - correct answer the part of an enzyme where a substrate molecule binds
Active transport - correct answer Movement of molecules and ions across a plasma membrane
against the concentration gradient using energy
adaptation - correct answer A characteristic that increases an organism's chances of survival
Affinity for Oxygen - correct answer the tenancy a molecule gas to bind with oxygen
Allele - correct answer an alternative form of a gene
Aeolus - correct answer a microscopic air sac in the lungs where gas exchange occurs
Amino Acid - correct answer A monomer of proteins
Aneurysm - correct answer A balloon like swelling of an artery
Antibiotic - correct answer A chemical used to teat bacterial diseases
Antibiotic Resistance - correct answer When bacteria are able to survive in the presence of
antibiotics
Antibody - correct answer A protein produced by B cells in response to the presence of a
pathogen
Antigen - correct answer A molecule found on the surface of a cell. A foreign antigen triggers
an immune response.
Antigenic Variability - correct answer Where pathogens change their antigens
Apoplast pathway - correct answer A route that water takes through a plant root to the xylem
through cell walls.
Arteriole - correct answer A blood vessel that branches off an artery
Asthma - correct answer A respiratory condition where the airways become inflames and
irritated, usually because of an allergic reaction to substances such as pollen and dust
Atheroma - correct answer A fibrous plaque caused by the build up and hardening of white
blood cells, lipids and connective tissue
Atrioventricular node - correct answer A group of cells in the heart wall that are responsible for
passing waves of electrical activity from the SAN onto the bundle of his
Atrioventricular valve - correct answer A valve in the heart linking the atria to the ventricles
, AS Level Biology / AS Level Biology EXAM COMPLETE 2 VERSIONS WITH 214 QUESTIONS AND
CORRECT DETAILED ANSWERS (VERIFIED ANSWERS) |ALREADY GRADED A+
B cell - correct answer a type of white blood cell involved in the immune response, it produces
antibodies
Base - correct answer A nitrogen containing molecule that forms part of a DNA nucleotide
Benedict's test - correct answer A biochemical test for the presence of sugars
Biodiversity - correct answer The variety of living organisms and ecosystems on earth
Biuret test - correct answer A biochemical test for the presence of polypeptides and proteins
Bohr effect - correct answer An effect by which an increase of carbon dioxide in the blood
results in a reduction of hemoglobin's affinity for oxygen
Bundle of His - correct answer A group of muscle fibers in the heart responsible for conducting
waves of electrical activity from the AVN to the purkyne fibers
Carbohydrase - correct answer An enzyme that catalyzes the hydrolysis of carbohydrates
Cardiac Cycle - correct answer An ongoing sequence of conraction and relaxation of the atria
and ventricles that keeps blood continuously circulating blood round the body
Cardiac output - correct answer The volume of blood pumped by the heart per minute
Cardiovascular disease - correct answer any disease associated with the heart and blood
vessels
Casparian strip - correct answer a waxy strip in the cell wall of an endodermis cell
Catalyst - correct answer A chemical that speeds up a chemical reaction without being used up
or changed itself.
Causal relationship - correct answer Where a change in one variable causes a change in
another
Cell fractionation - correct answer A method that separates the organelles in a cell
Cellular immune response - correct answer the immune response that involves T cells
Cellulose - correct answer A polysaccharide made of long unbranched chains of beta glucose
Centrometer - correct answer The point at which two strands of a chromosome are joined
together
Chloroplast - correct answer An organelle present in plant cells where photosynthesis occurs
Chromatid - correct answer One arm of a double stranded chromosome
Chromosome - correct answer A thread like structure made up of one long DNA molecule
CORRECT DETAILED ANSWERS (VERIFIED ANSWERS) |ALREADY GRADED A+
Activation Energy - correct answer The energy that needs to be supplied before a chemical
reaction will start
Active site - correct answer the part of an enzyme where a substrate molecule binds
Active transport - correct answer Movement of molecules and ions across a plasma membrane
against the concentration gradient using energy
adaptation - correct answer A characteristic that increases an organism's chances of survival
Affinity for Oxygen - correct answer the tenancy a molecule gas to bind with oxygen
Allele - correct answer an alternative form of a gene
Aeolus - correct answer a microscopic air sac in the lungs where gas exchange occurs
Amino Acid - correct answer A monomer of proteins
Aneurysm - correct answer A balloon like swelling of an artery
Antibiotic - correct answer A chemical used to teat bacterial diseases
Antibiotic Resistance - correct answer When bacteria are able to survive in the presence of
antibiotics
Antibody - correct answer A protein produced by B cells in response to the presence of a
pathogen
Antigen - correct answer A molecule found on the surface of a cell. A foreign antigen triggers
an immune response.
Antigenic Variability - correct answer Where pathogens change their antigens
Apoplast pathway - correct answer A route that water takes through a plant root to the xylem
through cell walls.
Arteriole - correct answer A blood vessel that branches off an artery
Asthma - correct answer A respiratory condition where the airways become inflames and
irritated, usually because of an allergic reaction to substances such as pollen and dust
Atheroma - correct answer A fibrous plaque caused by the build up and hardening of white
blood cells, lipids and connective tissue
Atrioventricular node - correct answer A group of cells in the heart wall that are responsible for
passing waves of electrical activity from the SAN onto the bundle of his
Atrioventricular valve - correct answer A valve in the heart linking the atria to the ventricles
, AS Level Biology / AS Level Biology EXAM COMPLETE 2 VERSIONS WITH 214 QUESTIONS AND
CORRECT DETAILED ANSWERS (VERIFIED ANSWERS) |ALREADY GRADED A+
B cell - correct answer a type of white blood cell involved in the immune response, it produces
antibodies
Base - correct answer A nitrogen containing molecule that forms part of a DNA nucleotide
Benedict's test - correct answer A biochemical test for the presence of sugars
Biodiversity - correct answer The variety of living organisms and ecosystems on earth
Biuret test - correct answer A biochemical test for the presence of polypeptides and proteins
Bohr effect - correct answer An effect by which an increase of carbon dioxide in the blood
results in a reduction of hemoglobin's affinity for oxygen
Bundle of His - correct answer A group of muscle fibers in the heart responsible for conducting
waves of electrical activity from the AVN to the purkyne fibers
Carbohydrase - correct answer An enzyme that catalyzes the hydrolysis of carbohydrates
Cardiac Cycle - correct answer An ongoing sequence of conraction and relaxation of the atria
and ventricles that keeps blood continuously circulating blood round the body
Cardiac output - correct answer The volume of blood pumped by the heart per minute
Cardiovascular disease - correct answer any disease associated with the heart and blood
vessels
Casparian strip - correct answer a waxy strip in the cell wall of an endodermis cell
Catalyst - correct answer A chemical that speeds up a chemical reaction without being used up
or changed itself.
Causal relationship - correct answer Where a change in one variable causes a change in
another
Cell fractionation - correct answer A method that separates the organelles in a cell
Cellular immune response - correct answer the immune response that involves T cells
Cellulose - correct answer A polysaccharide made of long unbranched chains of beta glucose
Centrometer - correct answer The point at which two strands of a chromosome are joined
together
Chloroplast - correct answer An organelle present in plant cells where photosynthesis occurs
Chromatid - correct answer One arm of a double stranded chromosome
Chromosome - correct answer A thread like structure made up of one long DNA molecule
