DB 014 BIOLOGY TUTORIAL WORKSHEET (BIO TWO)...(BIO TWO) BIOLOGY WORKSHEET CHAPTER 1 : MOLECULES OF LIFE Subtopic : 1.1 Water Learning Outcome : a) Illustrate the structure of water

DB 014

BIOLOGY TUTORIAL WORKSHEET

(BIO TWO)

BIOLOGY WORKSHEET

CHAPTER 1 : MOLECULES OF LIFE

Subtopic : 1.1 Water

Learning Outcome :

a) Illustrate the structure of water molecules

b) State the properties of water molecules

PART A : MULTIPLE CHOICE

QUESTIONS

1. Water is a universal solvent due to

its

A. Low viscosity

B. Polar molecules

C. High specific heat capacity

D. High boiling point

2. Water carries out all the following

functions in life, except as a

A. Lubricant

B. Cooling agent

C. Source of carbon

D. Chemical reagent.

3. Water has a high specific heat

capacity because

A. It can ionize

B. It is a poor insulator

C. Hydrogen bonds must be broken to

raise its temperature

D. Covalent bonds must be broken

to raise its temperature.

4. Leaves of plants pull water upwards

from the roots. Which property of

water explain this

A. Solubility

B. Polarity

C. Low viscosity

D. Cohesion and adhesion forces.

5. Which of the following is possible

due to the high surface tension of

water?

A. Water can acts as a solvent

B. Ice is formed at low temperature

C. A water strider can walk on water

D. Lakes do not freeze solid during

winter.

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(BIO TWO)

1. Label the angle between the covalent bonds of water molecule

2. Identify the properties of water with their importance.

Importance Properties

Polar molecules can dissolve easily in water.

Organisms can maintain stable body

temperature.

Gives cooling effect to organisms.

Aquatic organisms can survive in frozen

lakes.

Insects can walk on water surface.

Water can move easily from cell to cell.

3. a) Draw water molecules and label the angle within water molecule hydrogen bond

i.

[3 marks]

b) How many water molecules can bind with one water molecule? [1 mark]

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c) Give TWO significance of hydrogen bonding in water molecules. [2 marks]

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d) Why must water absorb relatively large quantity of heat in order to change its temperature?

[2 marks]

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(BIO TWO)

e) Why water is a polar molecule? [2 marks]

4. FIGURE 1 shows the interaction between water molecules.

FIGURE 1

(i) Name the bonds labelled A and B in FIGURE 1. [2 marks]

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(ii) Which property of water gives cooling effect to organisms? [1 mark]

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(iii) Why water is a good solvent? [2 marks]

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A

B

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(BIO TWO)

CHAPTER 1 : MOLECULES OF LIFE (CARBOHYDRATES)

Subtopic : 1.2 Carbohydrates

Learning Outcome :

a) State the classes of carbohydrates such as monosaccharides , disaccharides and

polysaccharides.

b) Identify the structure α-glucose and β-glucose (monosaccharides) ,maltose

(disaccharides) and cellulose (polysaccharides).

c) Describe condensation and hydrolysis

d) Illustrate the formation and breakdown of maltose

PART A : MULTIPLE CHOICE QUESTIONS

1. All of the following are

characteristics of monosaccharides except

A. Sweet tasting

B. Dissolve in water

C. Insoluble in water

D. Form white crystal

2. Most carbohydrates in plants are

transported in the form of

A. Glucose

B. Sucrose

C. Maltose

D. Lactose

3. Which of the following is made up

of the condensation of β-glucose monomers?

A. Sucrose

B. Cellulose

C. Starch

D. Glycogen

4. Which of the following statements

about carbohydrates is NOT true?

A. Monosaccharide also known as

simple sugar

B. Monosaccharide can be joined

together with peptide bonds

C. Cellulose and lactose are

carbohydrates

D. Glycogen is a storage carbohydrate

in animal cells.

PART B : STRUCTURED QUESTIONS

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(BIO TWO)

1. Name the structures shown in FIGURE 2.

FIGURE 2

2. Name the process involved in the formation and breakdown of maltose.

3. FIGURE 3 shows a polysaccharide molecule.

FIGURE 3

i) Name the bond labeled Z. [1 mark]

Z

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(BIO TWO)

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ii) Identify the monomer for the polysaccharide molecule shown in FIGURE 3.[1 mark]

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iii) What is the reaction involved in the formation of the polysaccharide molecule? [1 mark]

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CHAPTER 1 : MOLECULES OF LIFE (LIPIDS)

Subtopic : 1.3 Lipids

Learning Outcome :

a) State the types of lipid: triglycerides (fats and oil), phospholipids and steroids.

b) Describe the structure of fatty acids and glycerols.

c) State the functions of lipids

PART A : MULTIPLE CHOICE QUESTIONS.

1. The phosphate group in phospholipid

is

A. Polar and hydrophilic

B. Non-polar and hydrophobic

C. Ionized in water

D. Uncharged

2. A fatty acid is saturated if its

hydrocarbon chain

A. Is shorter with one double bond

B. Has one or more double bonds

C. Contain the maximum number of

oxygen atoms

D. Contain the maximum number of

hydrogens atoms.

3. How many fatty acid molecules are

present in a triglyceride molecule?

A.2

B.1

C.4

D.3

4. Triglycerides are formed from the

condensation of

A. Three molecules of glycerol and one

molecule of fatty acid

B. Three molecules of fatty acid and

one molecule of glycerol

C. Three molecules of fatty acid and

three molecules of glycerol

D. One molecule of fatty acid and one

molecule of glycerol.


does not describe a function of lipids?

A. An electrical insulator

B. A thermal insulator

C. A source rich in energy

D. Form cell walls.


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(BIO TWO)

1. State three types of lipid with examples and its characteristics.

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2. Label FIGURE 4.

FIGURE 4 :The structure of triglyceride

3. Draw two components that can form triglyceride.

4. FIGURE 5 shows the structure of a triglyceride molecule or fat.

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(BIO TWO)

FIGURE 5

a) Name the type of fat in FIGURE 5. [1 mark]

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b) Give the reason for your answer in 4 (a). [1 mark]

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c) Name the type of reaction that breaks the compound in FIGURE 5. [1 mark]

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5. State the functions of lipids in human. [5 marks]

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CHAPTER 1 : MOLECULES OF LIFE (PROTEINS)

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(BIO TWO)

Subtopic : 1.4 Proteins

Learning Outcome :

a) Describe the basic structure of amino acids.

b) State how amino acids are grouped

c) Illustrate formstion and breakdown of dipeptide


1. Which of the following is not a

protein?

A. Haemoglobin

B. Cholesterol

C. Antibody

D. Insulin

2. Polysaccharides, proteins and nucleic

acids are similar in that they

A. Synthesized from monomers by the

process of hydrolysis

B. Synthesized from monomers by

dehydration reactions

C. Synthesized as a result of a peptide

bond formation between monomers

D. Decomposed into their subunits by

dehydration reaction.


concerning the amino groups in amino acids

is TRUE?

A. There are acidic

B. They are non-polar

C. They contain nitrogen

D. They are charged.

4. The 20 different amino acids

found in polypeptides exhibit different

chemical and physical properties

because of different

A. Carboxyl group attached to an

α- carbon

B. Amino groups attached to an α-

carbon

C. Side chain

D. α- carbon


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(BIO TWO)

1. Label the basic structure of amino acid in FIGURE 6.

FIGURE 6 : Amino acid monomer

(a) State the group labeled A, B and C. [3 marks]

(b) State the importance of R group. [1 mark]

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2. State how amino acids are grouped.

B

A

C

According to the properties of their side chain

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3. Name the process involves in the formation and breakdown of dipeptide.

Diagram 3: Formation of dipeptide

Diagram 6 : Breakdown of dipeptide

CHAPTER 1 : MOLECULES OF LIFE (DNA and RNA molecules)

SUBTOPIC : 1.5 : DNA and RNA molecules

LEARNING OUTCOME:

a) State the structure of nucleotide as the basic component of nucleic acid (DNA and

RNA).

b) Differentiate between DNA and RNA nucleotides

c) Describe the structure of DNA based on the Watson and Crick Model


1. Ribose and deoxyribose are

A. Nucleotides

B. Disaccharides

C. Pentose sugars

D. Nitrogen bases

2. The phosphodiester linkage in DNA or

RNA is formed between

A. Two bases

B. Two phosphates

C. Sugar and base

D. Sugar and phosphate

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3. The double helix structure of DNA is

held together by

A. Ionic bonds

B. Peptide bonds

C. Hydrogen bonds

D. Phosphodiester bonds

4.Choose the correct statement

A. the molecular structure of a purine

base is a double ring

B. the molecular structure of a

pyrimidine base is a double ring

C. adenine and thymine are purine

bases

D. cytosine and guanine are pyrimidine

bases.

5 . The double helix structure of DNA is

maintained by the bond formed between

A. a sugar and a phosphate group

B. a sugar and a nitrogenous base

C. a purine base and a pyrimidine base

D. the same groups of nitrogenous base.


1. Name the components of a nucleotide.

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(BIO TWO)

2. Two families of nitrogenous bases:

3. Identify the structure Z in DNA based on the Watson and Crick Model

4. FIGURE 7 shows a monomer of a DNA molecule.

FIGURE 7

(a) Name the monomer. [1 marks]

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Z

C

B

A

Cytosine, Uracil,

Thymine

A, G

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(BIO TWO)

(b) Based onFIGURE 7, label A ,B and C. [3 marks]

(c) Guanine and cytosine are the organic bases in the formation of DNA molecule. Name the

bond that binds the two bases. [1 mark]

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(d) How many bonds are formed between the bases in 3 (c)? [1 mark]

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(e) Give TWO differences between DNA and RNA based on their function. [2 marks]

DNA RNA

Documents

DB 014 BIOLOGY TUTORIAL WORKSHEET (BIO TWO)...(BIO TWO) BIOLOGY WORKSHEET CHAPTER 1 : MOLECULES OF LIFE Subtopic : 1.1 Water Learning Outcome : a) Illustrate the structure of water