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AQA A level Biology 2022 Past Paper 1 Questions And Answers
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10/23/24, 10:00 AMAQA A level Biology 2022 Past Paper 1
Questions And Answers
Terms in this set (34)
Structure:
1) Nuclear envelope and pores
2) Chromosomes/chromatin
3)Nucleolus
1) Describe the structure and function of
the nucleus Function: (2 max)
1) Stores genetic information/material for polypeptides (production)
2) DNA replication
3) Production of mRNA/tRNA OR Transcription occurs
4) Production of rRNA/ribosomes
1.2) Name the main polymer that forms the Plant cell wall : cellulose
following cell walls Fungal cell wall: Chiten
individual organisms could not be separated/identified
1.3) Suggest one reason the scientists used
OR
biomass instead of the number of
too time-consuming
individuals of each plant species when
OR
collecting data to measure diversity
too small/numerous to count individuals
1.4) 0.7-0.71
1) Some bacteria have alleles for resistance (due to mutation))
2.1) C difficile is a bacterial species that 2) (exposure to) antibiotics is the selection pressure
causes disease in humans OR
Antibiotic resistant strains of C. diffcile have Non resistant bacteria die
become a common cause of infection OR
acquired when in hospital resistant bacteria survive/reproduce
Explain how the use of antibiotics has led 3) more antibiotics used in hospital (compared with elsewhere)
to antibiotic- resistant strains OR
Patients have weakened immune system
2.2) Name another disaccharide formed maltose
from two glucose molecules
1/6
, 10/23/24, 10:00 AM
2.3) Scientists investigeted the effect of 1) Wash hands with soap/ disinfect surfaces
trehalose on the growth rate of C. difficile. 2) use sterile pipette/syringe
They grew populations of non-resistantand 3 (remove bottle lid and) flame neck of bottle
antibiotic resistant C. difficle on separate 4) remove the lid of (agar) plate at an angle
agar plates with: 5) place pipette/spreader into disinfectant (immediately after use)
-No carbohydrate added 6) Use sterile spreader/inoculating loo
- Trehalose added 7) Work close to upward air movement (convection current)
They measured the growth rate of the C.
dificle
Describe how the scientists could use
aseptic techniqies to transfer 0.3cm&3 of C-
diffucule in liquid culture from a bottle on
to an agar plate
For
1) Resistant bacteria grow faster with trehalose
2) So resistant bacteria (likely to) increase in frequency in the population/people
3) Resistant bacteria (likely to) outcompete non-resistant bacteria
2.4) Use figure 2 to evaluate whether more
trehalose in the diet could be a factor in Against:
the increased number of antibiotic resistant 4) In laboratory not in people
C. difficile infections 5) other disaccharides (in the diet) might affect bacteria
6) Other bacterial species (in the body) might affect bacteria
7) no stats test to see if difference/increase is significant
8) no data for both resistant and non- resistant bacteria growing together
9) no data for different concetrations of trehalose
1) smaller 70S ribosomes
no membrane bound organelles (or example mitochondria)
3.1) Give two features of all prokaryotic
circular loop of DNA ( in cytoplasm)
cells that are not features of eurkaryotic
DNA free in cytoplasm
cells
DNA not associated with histones/proteins
Murien/peptidoglycan in cell wall
3.3) The amino acids on side of each AP 1) Hydrophobic sides next to face/ fatty acid tails
helix have hydrophobic properties or
The amino acids on the opposite side of hydrprobic side next to/faces hydrophonic part of phospholipid bilayer
each helix have hydrophilic properties
2) Hydrophilic side allows ion movement through
Suggest how these properties of the APS or hydrophilic sides form a channel
allow them to become positioned across
the membrane and make a channel through
which ions can pass
3.4) Maths q
2/6
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