OCR Combined Science A Papers 1 and 7 E-Mock

#1. What are the monomers of proteins?

amino acids

carbohydrates

nucleotides

mitochondria

chloroplasts

DNA

fatty acids

#2. Growth hormone stimulates cells in muscles and bones to divide. It also stimulates another system, which system is this?

Digestive system - increased absorption of calcium

Matriculation system - increases the rate of matriculation in the organs

Circulatory system - increase in breathing rate

#3. What is the function of the cell wall?

Protein synthesis

Provide strength and support

Provides no function

Photosynthesis

Cellular respiration

#4. Which system is responsible for ensuring the supply of oxygen and glucose to cells?

Circulatory System

Immune System

Nervous System

#5. What does μm stand for?

#6. Why does the rate of an enzyme controlled reaction increase with greater substrate concentration?

The rate of reaction increases because there are available active sites, so more reactions take place

The rate of reaction increases because higher substrate concentration leads to warmer temperatures

The rate of reaction does not increase

#7. What is the process by which organisms remove waste from their bodies?

#8. What is the definition of resolution?

The smallest distance between two points that can be distinguished as separate

The largest distance between two points that can be distinguished as separate

The furthest away you can be from the eyepiece lens and still see a clear image

#9. Which of the following is an effect stimulated by the thyroxine hormone?

increased heart rate

Increased stride length

decreased growth rate

increased density of bones

#10. Multicellular organisms are too large to allow diffusion through their cells to provide the necessary resources. Instead we have transport systems. What is the name of the transport system that uses capillaries to transport substances via the blood?

Circulatory system

Respiratory system

Digestive system

Histomine system

#11. Is diffusion an active or a passive process?

passive

active

#12. What is the part of the heart that the arrows are pointing to?

The pulmonary vein

The pulmonary artery

The vena cava

The right atrium

The left atrium

#13. What is the balanced chemical equation for photosynthesis?

CO₂ + H₂O → 2C₆H₁₂O₆ + 6O₂

C₆H₁₂O₆ → 2O₂ + CO₂

6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂

6CO + 6H₂ → C₆H₁₂O₆

#14. Which of the following is part of the central nervous system (CNS)?

spinal cord

receptor-effector system

sensory neurones

receptors

#15. What is the gap between neurones called?

#16. Why is there a size limit to cells?

Larger cells than the size limit are not able to hold themselves together due to the static pressure associated with larger size

Larger cells than the size limit cannot get substances they need to where they need them

#17. Where does blood from the aorta travel to?

The lungs

The rest of the body

#18. What is the molecular formula for glucose?

CO₆

CH₄

C₆H₁₂O₆

#19. Which of the following describes metabolic rate?

The average growth rate over 14 days

The rate at which blood leaves the aorta

The rate at which energy from food is consumed by your body

#20. Through which process do chemicals move across synapses?

#21. Electron microscopes have much higher resolution and magnification than light microscopes. What are the advantages of this?

Microscopes are easier to use since they are not always blurry

Electron microscopes do not have a higher resolution than light microscopes

Can see into the internal structure of mitochondria, chloroplasts, and other subcellular structures.

#22. What is meant by an active process?

the process requires energy and it happens on its own

the process does not require energy and it is automatic

the process requires energy and does not happen on its own

#23. Which sub-cellular structures can be found in bacteria?

Select all that apply:

Mitochondria

Cell membrane

Chloroplasts

Plasmids

Chromosomal DNA

Cytoplasm

Ribosomes

Cell wall

Vacuole

Nucleus

#24. What are the monomers of fats/lipids?

DNA

carbohydrates

chloroplasts

fatty acids

nucleotides

amino acids

proteins

mitochondria

#25. Organs that exchange substances into and out of the body have:

Small surface area to volume ratio's

Large surface area to volume ratio's

#26. What are cells that line structures in the body and have cilia?

chitinous cells

ciliated epithelial cells

epithelial cells

zygotic cells

#27. Which part of the heart separates the two sides?

The pulmonary artery

The septum

The inferior vena cava

The superior vena cava

#28. What do we call an organ that is affected by a specific hormone?

A stimulated organ

A general organ

A target organ

#29. In which sub-cellular structure inside plant cells does photosynthesis occur?

#30. Which pathway is used when rapid automatic responses are needed by your body to external stimuli, like touching a hot object?

via reflex arcs

through the normal pathways

via the CNS

#31. Which of these is an effector?

brain

glands

bones

teeth

#32. In active transport – are particles travelling with or against the concentration gradient?

against

with

#33. True or false – A concentration gradient is the difference in concentration from high to low?

true

false

#34. Increases in thyroxine concentration in the blood cause a decrease in the amount of thyroxine released. What kind of feedback mechanism is this?

Postive feedback

Negative feedback

#35. Which of the following is part of the central nervous system (CNS)?

relay neurones

brain

motor neurones

#36. Which of the following are prokaryotes?

Select all that apply:

Bacteria

Plants

Animals

Archaea

Fungi

#37. Which sub-cellular structures can be found in animals?

Select all that apply:

Cell wall

Vacuole

Cytoplasm

Chloroplasts

Ribosomes

Cell membrane

Nucleus

Mitochondria

Plasmids

#38. In diffusion – are particles travelling with or against the concentration gradient?

with

against

#39. What is the name of the chemicals that we use to transmit messages through the blood to organs?

#40. How many chambers does the heart have?

4

1

3

2

#41. What is enzyme specificity?

the efficiency of an enzyme in catalysing reactions

describes the ability of an enzyme to catalyse only a particular reaction or set of reactions

the active site changes to fit with new substrates over its lifetime

#42. When is adrenaline released?

When you are scared or excited

When you are relaxed

After a meal

When you are sleeping

#43. What is the Lock and Key Model of enzyme action?

the active site and the substrate fit exactly together

the active site and substrate do not fit exactly together but the shape changes as they come together

the active site is not related to enzyme action

the active site changes to fit with new substrates over its lifetime

#44. What is the role of lipase?

breaks down fats in the diet

synthesises glycogen from glucose

synthesises DNA from its monomers

breaks down starch to small sugars such as maltose

breaks down hydrogen peroxide made during cell reactions

breaks down proteins in the diet

synthesises starch from glucose

#45. What is the role of the nucleus?

Protects the cell from viruses

Helps to keep the cell warm

Contains genetic material and controls the cell

#46. Bacterial cells commonly have a flagellum. What is the role of this structure?

Movement

Protection

Supporting the cell

Photosynthesis

Protein synthesis

#47. Why do high breathing and heart rates remain after exercise?

Select all that apply:

It takes a few minutes for the heart and lungs to respond to a change in physical activity

To replace the oxygen lost from blood and muscles

Additional oxygen is required to get the energy needed to remove lactic acid

#48. Place the measurement units in order from from biggest to smallest. micrometres, picometres, kilometres, metres, nanometres, millemetres ? Use British Spelling - Metres* NOT Meters

#49. Which of the following are 3 of the adaptations of leaves for efficient photosynthesis?

Select all that apply:

Guard cells open and close stomata - control water loss

Guard cells open and close the entrance to leaves from stems - isolates infected leaves

Transparent epidermis - allows sunlight to travel straight into the leaves

Palisade layer filled with chloroplasts is just below the epidermis - maximising light intensity

Chloroplasts migrate back into the stems overnight - protects them from cold weather

#50. Motor neurones carry impulses to which part of the nervous system?

effectors

CNS

CFS

#51. Why is the rate of an enzyme controlled reaction highest at an optimum pH?

at high and low pH the substrates and enzymes repel each other

it is not different and there is no optimum

above and below the optimum the shape of the active site is changed

#52. What travels along neurones to pass information through the nervous system?

chemicals

electrical signals

protons

photons

#53. What is the role of starch synthase?

breaks down proteins in the diet

breaks down starch to small sugars such as maltose

breaks down hydrogen peroxide made during cell reactions

breaks down fats in the diet

synthesises starch from glucose

synthesises glycogen from glucose

synthesises DNA from its monomers

#54. Palisade cells are found just below the epidermis of leaves. What is their role and how are they adapted to perform it?

making proteins - they contain lots of ribosomes

photosynthesis - they contain lots of chloroplasts

plant protection - they contain lots of mitochrondria

#55. Through which process do nutrients enter root hair cells from the soil?

diffusion

active transport

osmosis

#56. What are the upper chambers of the heart called?

The valves

The ventricles

The septums

The atria

#57. Why does the rate of an enzyme controlled reaction plateau at a certain substrate concentration? ? plateau means level out

rate of reaction plateaus because above a certain substrate concentration, pH rises causing denaturation

it does not plateau

all of the active sites are occupied and so additional substrates cannot find an active site

#58. What is the cell wall made from in bacteria?

Not sure

Peptidoglycan

Chitin

Cellulose

#59. Which type of white blood cell engulfs (surrounds) foreign cells in order to digest them?

Parcocytes

Lymphocytes

Pregocytes

Phagocytes

#60. Arteries carry blood around the body, do they carry blood away from or towards the heart?

Towards

Away from

Remember – Arteries Away

GCSE OCR Combined Science A Papers 1 and 7

Good Luck!

Results

#1. What are the monomers of proteins?

#2. Growth hormone stimulates cells in muscles and bones to divide. It also stimulates another system, which system is this?

#3. What is the function of the cell wall?

#4. Which system is responsible for ensuring the supply of oxygen and glucose to cells?

#5. What does μm stand for?

#6. Why does the rate of an enzyme controlled reaction increase with greater substrate concentration?

#7. What is the process by which organisms remove waste from their bodies?

#8. What is the definition of resolution?

#9. Which of the following is an effect stimulated by the thyroxine hormone?

#10. Multicellular organisms are too large to allow diffusion through their cells to provide the necessary resources. Instead we have transport systems. What is the name of the transport system that uses capillaries to transport substances via the blood?

#11. Is diffusion an active or a passive process?

#12. What is the part of the heart that the arrows are pointing to?

#13. What is the balanced chemical equation for photosynthesis?

#14. Which of the following is part of the central nervous system (CNS)?

#15. What is the gap between neurones called?

#16. Why is there a size limit to cells?

#17. Where does blood from the aorta travel to?

#18. What is the molecular formula for glucose?

#19. Which of the following describes metabolic rate?

#20. Through which process do chemicals move across synapses?

#21. Electron microscopes have much higher resolution and magnification than light microscopes. What are the advantages of this?

#22. What is meant by an active process?

#23. Which sub-cellular structures can be found in bacteria?

#24. What are the monomers of fats/lipids?

#25. Organs that exchange substances into and out of the body have:

#26. What are cells that line structures in the body and have cilia?

#27. Which part of the heart separates the two sides?

#28. What do we call an organ that is affected by a specific hormone?

#29. In which sub-cellular structure inside plant cells does photosynthesis occur?

#30. Which pathway is used when rapid automatic responses are needed by your body to external stimuli, like touching a hot object?

#31. Which of these is an effector?

#32. In active transport – are particles travelling with or against the concentration gradient?

#33. True or false – A concentration gradient is the difference in concentration from high to low?

#34. Increases in thyroxine concentration in the blood cause a decrease in the amount of thyroxine released. What kind of feedback mechanism is this?

#35. Which of the following is part of the central nervous system (CNS)?

#36. Which of the following are prokaryotes?

#37. Which sub-cellular structures can be found in animals?

#38. In diffusion – are particles travelling with or against the concentration gradient?

#39. What is the name of the chemicals that we use to transmit messages through the blood to organs?

#40. How many chambers does the heart have?

#41. What is enzyme specificity?

#42. When is adrenaline released?

#43. What is the Lock and Key Model of enzyme action?

#44. What is the role of lipase?

#45. What is the role of the nucleus?

#46. Bacterial cells commonly have a flagellum. What is the role of this structure?

#47. Why do high breathing and heart rates remain after exercise?

#48. Place the measurement units in order from from biggest to smallest. micrometres, picometres, kilometres, metres, nanometres, millemetres ? Use British Spelling - Metres* NOT Meters

#49. Which of the following are 3 of the adaptations of leaves for efficient photosynthesis?

#50. Motor neurones carry impulses to which part of the nervous system?

#51. Why is the rate of an enzyme controlled reaction highest at an optimum pH?

#52. What travels along neurones to pass information through the nervous system?

#53. What is the role of starch synthase?

#54. Palisade cells are found just below the epidermis of leaves. What is their role and how are they adapted to perform it?

#55. Through which process do nutrients enter root hair cells from the soil?

#56. What are the upper chambers of the heart called?

#57. Why does the rate of an enzyme controlled reaction plateau at a certain substrate concentration? ? plateau means level out

#58. What is the cell wall made from in bacteria?

#59. Which type of white blood cell engulfs (surrounds) foreign cells in order to digest them?

#60. Arteries carry blood around the body, do they carry blood away from or towards the heart?

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