A LEVEL BIOLOGY MOCK Questions and
Correct Detailed Answers (Verified Answers)
Q: give three structural features found in all virus particles and describe the
function of one of these features
Ans: genetic material - codes for viral protein
capsid - protects the genetic material
attachment protein - binds to complementary receptors on cell
Q: explain why viruses are described as acellular and non-living
Ans: acellular - no cell-surface membrane
non-living - have no metabolic reactions and cannot independently
move/respire/replicate
Q: give one reason why antibiotics are not effective against viruses
Ans: -do not have bacterial structures/enzymes
-do not have metabolic processes
-do not have a cell wall
Q: explain the importance of one adaptation of the gas exchange surface
in the tracheal system of an insect
Ans: -tracheloe wall one cell think so short diffusion pathway
-tracheoles supply tissues, so diffusion directly into cells
-tracheoles are highly branched, so large surface are for rapid diffusion
, Q: explain the importance of the xylem being kept open as a continuous
tube
Ans: -allows unbroken water column
-cohesion from H bonds between all water molecules
-evaporation creates tension in column
Q: describe two functions of the golgi apparatus in a eukaryotic cell
Ans: -modify/transports/packages proteins
-modify/package/transport lipids
-forms/releases lysosomes
Q: explain why the damage to the cells in the lining the ileum (with microvilli)
reduces the absorption of the products of digestions and why this reduces
absorption of water
Ans: -reduced surface are
-decreases water potential in ileum
-so water moves out of cells into ileum by osmosis
Q: describe the aseptic techniques that should be used in investigating
bacterial growth
Correct Detailed Answers (Verified Answers)
Q: give three structural features found in all virus particles and describe the
function of one of these features
Ans: genetic material - codes for viral protein
capsid - protects the genetic material
attachment protein - binds to complementary receptors on cell
Q: explain why viruses are described as acellular and non-living
Ans: acellular - no cell-surface membrane
non-living - have no metabolic reactions and cannot independently
move/respire/replicate
Q: give one reason why antibiotics are not effective against viruses
Ans: -do not have bacterial structures/enzymes
-do not have metabolic processes
-do not have a cell wall
Q: explain the importance of one adaptation of the gas exchange surface
in the tracheal system of an insect
Ans: -tracheloe wall one cell think so short diffusion pathway
-tracheoles supply tissues, so diffusion directly into cells
-tracheoles are highly branched, so large surface are for rapid diffusion
, Q: explain the importance of the xylem being kept open as a continuous
tube
Ans: -allows unbroken water column
-cohesion from H bonds between all water molecules
-evaporation creates tension in column
Q: describe two functions of the golgi apparatus in a eukaryotic cell
Ans: -modify/transports/packages proteins
-modify/package/transport lipids
-forms/releases lysosomes
Q: explain why the damage to the cells in the lining the ileum (with microvilli)
reduces the absorption of the products of digestions and why this reduces
absorption of water
Ans: -reduced surface are
-decreases water potential in ileum
-so water moves out of cells into ileum by osmosis
Q: describe the aseptic techniques that should be used in investigating
bacterial growth
