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AQA A-Level Biology_ Paper 1 Questions And Answers
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10/23/24, 9:59 AMAQA A-Level Biology: Paper 1 Questions And Answers
Terms in this set (1355)
What type of theory can cell theory be A unifying concept
described as?
What is a unifying concpet? A concept that is universally accepted among the scientific community
- All living organisms are made up of one or more cells
What are the three main ideas that Cell
-Cells are the basic functional unit
Theory states?
- New cells are produced from pre-existing cells
Describe what is meant by this statement: That cells are the basic unit of structure and organization within an organism
"Cells are the basic functional unit"
Cell Surface Membrane
Cell wall
Mitochondria
Nucleus
Chloroplasts
Ribosomes
Name sub-cellular structures that compose Rough and Smooth Endoplasmic reticulum
the structure of Eukaryotic Cells Nucleolus
Golgi Apparatus
(vacuoles)
Vesicles
Lysosomes
Centrioles
Microtubules
What are all cells surrounded by? a cell surface membrane
What is the function of the plasma To control the exchange of materials between the internal and external environment
membrane? of the cell
What is the plasma membrane formed phospholipid bilayer
from?
It is a lipid that has a phosphate group attached to the glycerol and only two fatty
What is a phospholipid?
acid chains.
Estimate the diameter of the phospholipid ~10nm in diameter
bilayer of the cell surface membrane
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What term can be used to describe the partially permeable
plasmsa membrane
Define partially permeable membrane that allows some substances to cross but not others.
Where are cell walls formed? Outside the cell surface membrane
A rigid layer that supports the cell and provides shape while simultaneously
What is the function of the cell wall?
providing protection
How is the structural support of the cell Through the polysaccharide cellulose
wall provided in plants?
How is structural support of the cell wall Peptidoglycan (a.k.a. murein)
provided in most bacterial cells?
How can the cell wall be described? Freely permeable to most substances
Narrow threads of cytoplasm (surrounded by plasma membrane) connect the
What are plasmodesmata?
cytoplasms of neighbouring plant cells together
Describe the function of the mitochondria They are the site of aerobic respiration within eukaryotes
Describe the features of the Mitochondria's They are surrounded by a double membrane with the inner membrane folded to
membrane form structures called cristae.
-Increase surface area of the inner membrane
What are the functions of Cristae? -allows inner membrane to accommodate large numbers of the protein complexes
needed for: solute transport, electron transport, ATP synthesis
What is the area within the Mitochondria's the matrix
double membrane called?
What is the function of the matrix which is To contain enzymes required for aerobic respiration resulting in the synthesis of ATP
formed by the cristae?
Other than enzymes what else can be Small pieces of mitochondrial DNA and ribosomes are also found in the matrix which
found in the matrix and state its purpose are required for replication
Are mitochondria visible under light Just as they are large organelles
microscopes
Other than the plasms membrane what is Nucleus and it is relatively large
present in all eukaryotic cells?
What separates the nucleus from the A double membrane called the nuclear envelope which contains many nuclear pores
cytoplasm
They act as important channels for:
Why are nuclear pores important? [two
- mRNA and Ribosomes to travel out
marks in and out]
- enzymes and signaling molecules to travel in.
Give an example of an enzyme required in DNA polymerase
the nucleus
What can be found within the Chromatin
nucleoplasm?
When does chromatin dissolve into During the prophase stage of mitosis
Chromosomes?
What do Chromosomes consist of? Chromosomes consist of linear DNA tightly wound around proteins called histones
What sub-cellular structure do most nuclei Nucleolus
contain at least one of?
What is the function of the nucleolus? To be the site of ribosome production
AQA A-Level
What are Biology: Paper 1
Chloroplasts A membrane bound organelle which act as the site of photosynthesis
https://quizlet.com/869397648/aqa-a-level-biology-paper-1-flash-cards/ 2/6
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