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IB Unit 2 Molecular Biology SL

Total questions: 35

Worksheet time: 34mins

Name
Class
Date
1.

Which of the following reactions occurs when a dipeptide is formed from amino acids?

a)

Hydrolysis

b)

Denaturation

c)

Condensation

d)

Oxidation

2.

What is the function of helicase?

a)

It forms bonds between DNA nucleotides.

b)

It adds new nucleotides to the DNA helix.

c)

It forms the DNA helix.

d)

It separates DNA strands.

3.

Of the following products, which is produced by both anaerobic respiration and aerobic respiration in humans?


I. Pyruvate

II. ATP

III. Lactate

a)

I only

b)

I and II only

c)

I, II and III

d)

II and III only

4.

Which structure represents an amino acid?

a)

A

b)

B

c)

C

d)

D

5.

Why is the action spectrum for photosynthesis similar to the absorption spectra of photosynthetic pigments?

a)

Photosynthetic pigments have the same optimum temperature as the enzymes used in photosynthesis.

b)

Plants absorb the same photosynthetic pigments for use in photosynthesis.

c)

Only wavelengths of light absorbed by pigments can be used in photosynthesis.

d)

The amount of energy absorbed by photosynthetic pigments is equal to the activation energy for photosynthesis.

6.

What is a difference between the sense and antisense strands of DNA?

a)

Nucleotides are linked to the sense strand by hydrogen bonding during transcription, but not to the antisense strand.

b)

The sense strand has the same base sequence as tRNA, but the antisense strand does not.

c)

Nucleotides are linked to the antisense strand by hydrogen bonding during transcription, but not to the sense strand.

d)

The antisense strand has the same base sequence as mRNA but the sense strand does not.

7.

Which molecule is a monosaccharide?

a)

Ribose

b)

Glycogen

c)

Amylase

d)

Glycerol

8.

Which of the following features are correct for hydrogen bonding?


I. It is involved in the cohesion of water.

II. It results in the thermal properties of water.

III. It is a bond within the water molecule.

a)

I and II only

b)

II and III only

c)

I and III only

d)

I, II and III

9.

What is one role of the element phosphorus?

a)

It forms part of the structure of amino acids.

b)

It forms part of the structure of fatty acids.

c)

It forms part of the structure of ribose.

d)

It forms part of the structure of nucleotides.

10.

In the graph below which line shows an action spectrum of photosynthesis?

a)

A

b)

B

c)

C

d)

D

11.

What is the maximum number of fatty acids that can be condensed with glycerol?

a)

1

b)

2

c)

3

d)

4

12.

Which of the following features is/are present in mitochondria but not in chloroplasts?


I. DNA and ribosomes

II. Outer and inner membranes

III. Cristae

a)

I only

b)

II only

c)

III only

d)

I and III only

13.

Which diagram correctly illustrates a dipeptide?

a)

A

b)

B

c)

C

d)

D

14.

What is the correct sequence of chemicals produced in anaerobic respiration?

a)

Lactate → pyruvate → ethanol

b)

Ethanol → pyruvate → glucose

c)

Glucose → lactate → pyruvate

d)

Glucose → pyruvate → lactate

15.

Which events take place in DNA replication?


I. Formation of messenger RNA

II. Both strands act as templates

III. Formation of complementary strands by DNA polymerase

a)

I and II only

b)

I and III only

c)

II and III only

d)

I, II and III

16.

Humans can respire aerobically and anaerobically.


Which are products of both aerobic cell respiration and anaerobic cell respiration in humans?

a)

Pyruvate and ATP

b)

Pyruvate and lactate

c)

ATP and carbon dioxide

d)

Lactate and carbon dioxide

17.

Which two colours of light does chlorophyll absorb most?

a)

Red and yellow

b)

Green and blue

c)

Red and green

d)

Red and blue

18.

Which of the following are connected by hydrogen bonds?

a)

Hydrogen to oxygen within a molecule of water

b)

Phosphate to sugar in a DNA molecule

c)

Base to sugar in a DNA molecule

d)

Hydrogen to oxygen between two different molecules of water

19.

What is the source of the oxygen released into the air as a product of photosynthesis?

a)

Chlorophyll

b)

Carbon dioxide only

c)

Water only

d)

Both water and carbon dioxide

20.

What is the difference between galactose and lactose?

a)

Galactose is a sugar found in milk but lactose is not found in milk.

b)

Lactose is an enzyme and galactose is a hormone.

c)

Lactose is the product of anaerobic respiration in humans and galactose is the product of anaerobic respiration in yeast.

d)

Lactose is a disaccharide and galactose is a monosaccharide.

21.

Which statement about water is correct?

a)

The atoms within a molecule of water are held together by hydrogen bonds.

b)

Water has a low heat capacity allowing enzymatic reactions to happen at a wide range of temperatures.

c)

Water molecules are polar, therefore fatty acids do not dissolve.

d)

Ice has a higher density than liquid water, therefore some organisms can live under the ice.

22.

Which substance in organisms can contain sulfur?

a)

DNA

b)

Phospholipids

c)

Proteins

d)

Triglycerides

23.

A plant is exposed to increasing light intensity from very dim to bright light, while the carbon dioxide concentration and temperature are kept at an optimum level.


What will happen to the rate of oxygen production?

a)

It will increase exponentially.

b)

It will remain constant.

c)

It will decrease to a minimum level.

d)

It will increase to a maximum level.

24.

Which of these molecules is a disaccharide?

a)

Galactose

b)

Sucrose

c)

Cellulose

d)

Ribose

25.

Which molecule is shown?

a)

Glucose

b)

Galactose

c)

Ribose

d)

Sucrose

26.

Which of the following processes produces CO2?


I. Photosynthesis

II. Alcohol (ethanol) fermentation

III. Lactic acid production

a)

I only

b)

II only

c)

I and III only

d)

I, II and III

27.

In the model of the DNA molecule shown below, which arrows point to covalent bonds?

a)

I, II and III only

b)

II, III and IV only

c)

I, III and IV only

d)

I, II and IV only

28.

The antisense strand on the DNA molecule coding for three codons of a gene is:


TATCGCACG


What are the anticodons of the three tRNA molecules that correspond to this sequence?

a)

UAU, CGC and ACG

b)

ATA, GCG and TGC

c)

AUA, GCG and UGC

d)

TAT, CGC and ACG

29.

Which chemical is shown in the diagram below?

a)

saturated fatty acid

b)

cis-unsaturated fatty acid

c)

trans-unsaturated fatty acid

d)

glycerol

30.

Which of the following is/are true of cellulose?


I. It is an unbranched polymer of alpha-D-glucose

II. It contains β-1,4 glycosidic bonds

III. Hydrogen bonds form between parallel chains

a)

I and II only

b)

I and III only

c)

II and III only

d)

I, II and III

31.

Part of the base sequence of a mRNA molecule is:


UACGGA


What is the base sequence of the DNA sense strand that corresponds to this?

a)

ATGCCT

b)

UACGGA

c)

AUGCCU

d)

TACGGA

32.

Which one of the following molecules has an unbranched, linear structure?

a)

amylase

b)

amylopectin

c)

amylose

d)

glycogen

33.

Which of the following are direct methods used to measure the rate of photosynthesis?


I. production of oxygen

II. uptake of carbon dioxide

III. increase in biomass

a)

I only

b)

III only

c)

I and II only

d)

I, II and III

34.

What type of chemical is shown in the diagram?

a)

protein

b)

carbohydrate

c)

lipid

d)

DNA base

35.

Which of the following is/are true of photosynthesis?


I. Photolysis of CO2 provides electrons

II. Electrons are needed to convert CO2 into glucose

III. It is only carried out by plants

a)

I only

b)

II only

c)

I and II only

d)

I, II and III

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