unit 1 past paper questions Flashcards
Which of the following statements is true for proteins?
1. They are made in the nucleus.
2. They are affected by temperature.
3. They can be found in the cell membrane.
4. They all function as enzymes.
A 2 and 3 only
B 2 and 4 only
C 1, 3 and 4 only
D 2, 3 and 4 only
A
A sample of 350 bacterial cells were modified to produce a human protein.
Only 210 of these cells successfully produced the protein.
The percentage success was
A 60%
B 67%
C 140%
D 167%
A
Fermentation in yeast cells occurs in the
A cytoplasm
B mitochondria
C plasmids
D ribosomes.
A
An earthworm with a mass of 7 g uses up 3.5 cm3
of oxygen in 25 minutes.
Calculate the volume of oxygen used by this earthworm in 1 minute.
A 0.02 cm3
B 0.14 cm3
C 0.5 cm3
D 1.02 cm3
B
A role of stem cells in the human body is to produce
A antibodies for defence
B new skin tissue to repair a cut
C enzymes for digestion
D hormones for communication.
B
Hormones are
A electrical messengers that travel along neurons
B chemical messengers that travel along neurons
C electrical messengers that travel in the bloodstream
D chemical messengers that travel in the bloodstream.
D
Name the material that plant cell walls are made of
Cellulose
Apart from the difference in size give one other difference between a bacterial and plant cell
Bacterial cells have no nucleus/
mitochondria/vacuole/chloroplasts
and plant cells do
When water enters a plant cell the vacuole fills and swells until no more water can enter what is the term used to describe a plant cell in this state
Turgid
Name the type o molecule that proteins are made from
amino acids
Describe the feature of pepsin that allows it to bind to only one substrate
The active site of pepsin is complementary to the substrate
Name the type of respiration that yields the most ATP per glucose molecule
Aerobic
State why muscle cells require more mitochondria than skin cells
Muscle cells require more ATP than skin cells
The following statements relate to the transport of molecules across membranes:
1. Energy is required.
2. Molecules move from an area of high concentration to an area of low concentration.
3. Membrane proteins are involved.
Which of the statements apply to active transport?
A 1 and 2 only
B 1 and 3 only
C 2 and 3 only
D 1, 2 and 3
B
Where in a cell would mRNA not be found?
A Cell membrane
B Cytoplasm
C Nucleus
D Ribosome
A
The following statements relate to cellular processes:
1. Completed in the mitochondria.
2. Affected by temperature.
3. Release oxygen.
Which of the statements are correct for aerobic respiration?
A 1 and 2 only
B 1 and 3 only
C 2 and 3 only
D 1, 2 and 3
A
escribe the difference that would be found in the ultrastructure of plant cells
that do not carry out photosynthesis.
They would not contain any chloroplasts
Give the term used to describe the structure of a DNA molecule
Double stranded helix
Name the type of molecule coded for by a section of DNA
Protein
Animal cells left in a solution with a lower water concentration than their contents
A shrink
B burst
C become turgid
D become plasmolysed.
A
Which of the following reactions takes place during fermentation in plant cells?
A pyruvate - carbon dioxide + ethanol
B glucose - carbon dioxide + water
C glucose - water + ethanol
D pyruvate - lactate
A
Hormones are released by
A endocrine glands
B blood cells
C receptor cells
D target tissues
A
Describe the function of the cell membrane.
Controls what molecules enter and leave the cell
Enzymes can be involved in two types of reaction. The extraction of juice
from apple pulp is an example of a degradation reaction.
Name the other type of reaction.
Synthesis
Cellulase is an enzyme that speeds up the breakdown of a component of
the plant cell wall.
Name this component
Cellulose
What name is given to the substance that an enzyme breaks down?
Substrate
Name the substance that must be present for yeast to respire aerobically
Oxygen
Glucose molecules in low concentration in the kidney have to be moved into the
bloodstream, where there is a higher concentration of glucose.
The process responsible for this action is
A osmosis
B diffusion
C passive transport
D active transport.
D
Which of the following represents the sequence of events in the production of a protein
from the genetic code?
A DNA - amino acids - mRNA - protein
B DNA - mRNA - amino acids - protein
C mRNA - DNA - amino acids - protein
D amino acids - DNA - mRNA - protein
B
Which of the following are all types of proteins?
A Hormones, enzymes and nitrates
B Antibodies, enzymes and plasmids
C Hormones, receptors and antibodies
D Receptors, antibodies and nitrates
C
Explain why osmosis is described as a passive transport
Does not require energy
Describe the way in which the DNA strands are linked together
Complementary base pairing
Name the organelle in animal cells which stores the DNA
Nucleus
Name a cellular process which requires energy from ATP.
Muscle contraction/cell division/protein
synthesis/transmission of nerve
impulses/active transport.
Describe how enzymes are involved in th genetic modification process
To extract required gene from chormosome
Name the type of molecule coded for by a secton of DNA
protein
