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Biology PPE paper 1 revision
Biology PPE paper 1 revision
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Selected questions for GCSE 9-1 Combined Science Biology EDEXCEL paper 1
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30 cards
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Questions
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Answers
1
If cystic fibrosis is a recessive allele c, what must a person with cystic fibrosis have?
Heterozygous Cc
Two dominant alleles CC
Two recessive alleles cc
Heterozygous cC
2
Which is an advantage of electron microscopes over light microscopes?
simple to use
less resolution
greater magnification
portability
3
25. What is genetic engineering?
cutting sections of enzymes and adding chromosomes
removing genes and replacing them with enzymes
modifying enzymes by transferring alleles
transferring genes from one species into the DNA of another species
4
21. Which statement is NOT true about the structure of DNA
Contains 4 base pairs adenine, thymine, cytosine and guanine
Contains sugar phosphate backbone
Double helix shape
Contains strong oxygen bonds
5
5. A cell has an image size of 10mm under a microscope. If the magnification is 200x, calculate the actual size in mm
0.5
20
2000
0.05
6
14. What happens during interphase?
Chromosomes line up in the middle of the cell
chromosomes replicate (make copies of themselves)
Chromosomes separate to opposite ends of the cell
The cell starts to divide
7
9. Explain why the enzyme activity decreases above 40
o
Celcius
It has been killed by the high pH
All of the active sites are full up
It has been killed by the high temperature
It has been denatured because the shape of the active site is altered
8
17. What type of cell division produces haploid sex cells (gametes)?
meiosis
mitosis
osmosis
gametosis
9
Describe this stage of mitosis
Telophase
Prophase
Anaphase
Metaphase
10
27. Which is NOT an example of a communicable disease
chlamydia
Cholera
Cold
Cancer
11
18. How would you describe a person who had the alleles Bb for eye colour?
Homozygous
Carrier
Heterozygous
Sufferor
12
29. What is the equation used to calculate BMI?
= mass/ height 2
= mass + height
= mass x height2
= height / mass
13
6. Why is bacteria a prokaryotic cell?
It is not alive
It has a cell wall
It has no nucleus
It has a flagella
14
11. What will happen if potato chips are placed in pure water?
Water will move out of the cell by diffusion
Water will move out of the cells by osmosis and they will shrink
Water will move into the cell by diffusion and they will shrink
Water will move into the cell by osmosis and they will expand
15
28. What proteins on the surface of pathogens trigger an immune response?
lymphocytes
antigens
phagocytes
antibodies
16
27. What chemical that kills bacteria is found in tears?
Lysozyme
disinfectant
Protease
enzyme
17
2. Which part is found in plant cells but NOT in animal cells?
cell membrane
nucleus
ribsomes
cell wall
18
What is the product of mitosis?
two diploid body cells
two diploid sex cells
four diploid body cells
two haploid sex cells
19
23. Which kingdom do homo sapiens belong to?
Plantae
Protoctista
Fungi
Animalia
20
24. What type of organisms are in the domain Archaea?
animals
prokaryotes
fungi
Bacteria
21
3. How does the acrosome enable the sperm cell to fertilise the egg?
It contains ribsomes
It contains acrosomal DNA
It contains enzymes to digest the egg cell membrane
It contains nutrients
22
8. What is the optimum pH for protease enzyme that works in the stomach?
pH 2
pH 7
pH 5
pH 13
23
1. In which part of the cell does respiration take place?
chloroplasts
Mitochondria
Ribosomes
vacuole
24
16. What do we call the gap between neurones?
active site
synapse
myelin sheath
Reflex arc
25
10. Oxygen entering the blood from the lungs is an example of osmosis
False
True
26
30. What is a double blind trial?
Neither the doctor or the patient know who has been given the placebo
Healthy volunteers chose a placebo
The doctor chooses who will get a placebo
The drugs is tested on blind patients
27
7. What is the name of the part of the enzyme that the substrate binds to?
osmosis site
lock and key
protease site
active site
28
22. What are stem cells?
sperm cells
undifferentiated cells
specialised cells
egg cells
29
20. How many pairs of chromosomes are found in human body cells?
23 pairs
23
46 pairs
48
30
13. Body cells divide by which type of process?
Osmosis
Meiosis
Mitosis
metatosis
