Answer only four questions

Questions (1)

(A) Choose the correct answer

1- ………….. is from monosaccharides.

A- Sucrose B- Cellulose C- Glucose D- Maltose

2- …….. is a disaccharide whose polymer is composed of one glucose molecule and another fructose one

A- Sucrose B- Cellulose C- Maltose D- Lactose

3- ……….. is from phosphoproteins.

A- Casein B- Hemoglobin C- Albumin D- Insulin

(B) What happens if:-

1- Water didn't have high specific heat.

2- The temp. of an enzyme becomes zero.

3- Water didn't have high viscosity.

(C) Show the structures of the following

1- Amino acid

2- Complex enzyme

5- Nucleotide.

Question (2)

(A) What's meant by:-

1- Carbohydrates.

2- Enzymes

3- Anabolism

(B) Correct the underlines words

1- Animals store energy in the form of starch

2- Amylase is form complex enzymes.

3- Amino acids form biological macromolecules called lipids

4- Oils are lipids which form hormones inside human body.

(C) Give reasons for:-

1- The biological importance of enzymes.

2- Water has low viscosity and high surface tension.

3- Waxes cover the leaves of desert plants.

Question (3)

(A) Write the scientific term

1- Biological macromolecules whose general formula is (CH2O)n

2- The cohesion of molecules of the surface of a fluid such as water

3- Nucleic acids which take part in protein synthesis processes by copying genetic information.

4- A process by which molecules are broken inside cells to release energy.

5- A complex sugar which forms the cell walls of plant cells.

(B) What is the importance of

1- Carbohyrates

2- Proteins

(C) Draw a diagram of:-

Nucleotide.

Question (4)

(A) Write a short note about nanobiopharmaceuticals

(B) Mention the kind of the following organic compounds

1- Cellulose

2- Amylase

3- Casein

4- Steroids

(C) Draw a diagram of:-

Amino acid

Question (5)

(A) Choose the correct answer

1- The amount of heat required to increase the temp. of one gram of matter 1 Celsius degree is called ………..

A- Latent heat B- Specific heat C- Heat amount D- Work

2- Thyroid gland secretes thyroxin hormone, the protein of thyroxin hormone contains……. element

A- Iodine B- Phosphorus C- Calcium D- Potassium

3- ………. carries the hereditary traits of living organisms.

A- DNA B- RNA C- Amino acid D- Phosphoric acid

(B) Write the scientific term

1- The resistance of a fluid to flowing.

2- A stereoisomer which is responsible for enzyme work

3- A kind of protein found in milk.

(C) Rationalize:-

1- Water has unique properties.

2- The biological importance of lipids.

3- pH of solution affects enzymes work

Question (1)

(A) Choose the correct answer

1- Glucose

2- Sucrose

3- Casein

(B) What happens if:-

1- living organisms won't have constant temperature which is essential for the vital processes occurring within their bodies. The temperature of earth won't be suitable for life, which will cause the death of organisms on earth.

2- The activity of enzyme will stop.

3- The substances forming cells won't be held together, and plants' leaves will lose water quickly.

(C) Show the structure of

1- Molecules consist of basic carboxyl groups COOH-, acidic amine groups NH2 and side group (R).

2- It consists of complex proteins bound to non proteins parts (Active site), these parts may be inorganic metal atoms, or organic molecules called coenzymes.

3- It consists of pentose sugar (Ribose in RNA and Deoxyribose in DNA), phosphate group, and nitrogenous base Adenine (A), Thymine (T), Cytosine (C), Guanine (G) and Uracil (U)

Question (2)

(A) What's meant by:-

1- They are biological macromolecules formed from simple molecules (monosaccharides) which include starches, sugars and fibres. They consist of carbon, hydrogen and oxygen at ratio 1:2:1 respectively.

2- Biological catalysts formed from proteins molecules which speed up chemical reactions occurring within living organisms.

3- It builds complex molecules from simple one through a group of biochemical reactions within living cells.

(B) correct the underline words

1- Glycogen

2- Catalase

3- Proteins

4- Steroids

(C) Give reasons for

1- Because they play an important role in building complex molecules from simple ones, and breaking some molecules to release the energy stored in them.

2- Due to the hydrogen bonds between water molecules.

3- To decrease the amount of water lost during transpiration process.

Question (3)

(A) Write the scientific term

1- Carbohydrates.

2- Surface tension

3- RNA

4- Catabolism

5- Cellulose

(B) What is the importance of:-

Carbohydrates

1- The main and quickest source of energy in living organisms

2- They are used in storing energy in living organisms till they need it, as plants store carbohydrates in the form of starch, whereas animals and humans store them in the form of Glycogen in liver and muscles

3- The basic component of some parts of cell such as cellulose in the cell walls of plant cells, protoplasm and cellular membranes

Proteins

1 - They are from the basic component of cell membranes

, ligaments and tendons 2 - They form muscles, fingernails, hair, organs, glands

3- They form liquids in human body such as lymph and blood

4- They are necessary for human growth

5- The main component of chromosomes

6- They form enzymes and hormones

(C) Draw a diagram of nucleotide

Question (4)

(A) See page 42

(B) Mention the kind:-

1- Complex sugar (Carbohydrates)

2- Simple enzyme

3- Associated protein (Phosphoprotein)

4- Derivative lipids

(C) Amino acid

Question (5)

(A) Choose the correct answer

1- Specific heat

2- Iodine

3- DNA

(B) Write the scientific term

1- Viscosity

2- Active site

3- Casein protein

(C) Rationalize

1- Because of its polarity and the hydrogen bonds between its molecules.

2- Because they are:-

- A source of energy: The energy released from lipids is more than that released from carbohydrates. Thus, human body begins releasing energy from lipids when it runs out of carbohydrates

- The main component of cell membranes

- They make up 5% of the organic compounds forming living cell

- Some animals store lipids under their skins to protect them from low temperature (polar bears, penguins, seals)

- They work as protective layers in some plants and animals

- Some of them work as hormones (steroids)

3- Because enzymes are formed form amino acids which contain acidic amine groups and basic carboxyl groups.

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