BIOS 2101: Cell Biology by Dr Salah A. Martin

Chapter 0: REVISION QUESTIONS (2013-2014 Academic year)

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(N/B These revision Questions for chapter 0-Chemistry of life will be available and

accessible in this website only till Monday the 11

th

of November 2013.)

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(1) The large diversity of shapes of biological molecules is possible because of the extensive presence of

ringed or linear (e) the number of carbon atoms present.

(3) Dehydration synthesis is the process in which ____

(a) water molecules are attracted to each other. (b) water molecules are used as a source of raw material to

break down polymers to monomers. (c) water molecules are formed in the formation of polymers from

monomers (d) water molecules are attracted to each other and water molecules formed in the formation of

polymers from monomers (e) None of these choices is correct.

(4) What is the main sugar used by cells for energy?

(a) any polysaccharide (b) aspartame (c) sucrose (d) glucose (e) saccharin

(7) The characteristic that all lipids have in common is that ___

(a) they are all made of fatty acids and glycerol (b) they all contain nitrogen (c) none of them is very high

in energy content (d) they are all acidic when mixed with water (e) none of them dissolve in water.

(8) In some places, a polypeptide may coil in a helix or fold back on itself as a pleated sheet. This is called

___ and the coils or folds are held in place by ___.

(a) tertiary structure, ..covalent bonds (b) primary structure, ..hydrogen bonds (c) secondary structure,

..peptide bonds (d) tertiary structure, ..covalent bonds (e) secondary structure, ..hydrogen bonds.

(11) Glycogen is ___

(a) the form in which plants store sugars (b) a polysaccharide found in animals (c) a polysaccharide found

in plant cell walls (d) a transport protein that carries oxygen (e) a source of saturated fat.

(13) Which of these is a polysaccharide?

(a) sucrose (b) glucose (c) galactose (d) lactose (e) cellulose

(14) __ is the most abundant organic compound on earth

(a) Glucose (b) cellulose (c) lactose (d) starch (e) Glycogen

(15) Which of these does NOT contain a structural protein?

(a) muscles (b) tendons (c) ovalbumin (d) spider silk (e) ligaments

(16) Proteins are polymers of ___

(18) The secondary structure of a protein results from ___

(a) hydrogen bonds (b) ionic bonds (c) hydrophobic interactions (d) peptide bonds (e) bonds between

sulfur atoms

(19) Tertiary structure is not directly dependent on ___.

(a) hydrophobic interactions (b) peptide bonds (c) hydrogen bonds (d) ionic bonds (e) bonds between

sulphur atoms

(20) The two strands of a DNA double helix are held together by ___ that form between pairs of nitrogenous

bases.

base and a five-carbon sugar.

(22) Which of these is an amino group?

(a) R-COOH (b) R-COH (c) R-OH (d) R-NH

(23) Choose the pair of terms that completes this sentence: Hydroxyl group is to ___ as ___ is to amino

group.

(a) carbonyl …carboxyl (b) amino acids …fatty acid (c) carbon …nitrogen (d) sugar …sugar (e) alcohol

…amino.

proteins, nuclei acids, carbohydrates and lipids (d) nucleic acids, carbohydrates, monosacharides, and

proteins (e) RNA, DNA, proteins, and carbohydrates.

(26) Sugars are mainly used by our bodies

(28) Cellulose is a ___ made of many ___.

(a) polypeptide …monomers (b) carbohydrate …fatty acids (c) polymer …glucose molecules (d) protein

…amino acids (e) lipid …triglycerides.

(29) In what polysaccharide form do plants store sugar to be available later for energy?

(a) glycogen (b) cellulose (c) starch (d) protein (e) fatty acids

(30) The complex carbohydrate that you are most likely to have eaten recently is ___

(a) chitin (b) starch (c) glucose (d) lactose (e) ribose

(a) a steroid is to a lipid (b) a protein is to an amino acid (c) a nucleic acid is to a polypeptide (d) a

nucleotide is to a nucleic acid (e) an amino acid is to a nuclei acid.

(33) Cholesterol belongs to which class of molecules?

(a) protein (b) amino acids (c) lipids (d) carbohydrates (e) nucleic acid

(34) Protein molecules are polymers of ___.

(a) DNA molecules (b) chromosomes (c) ribosomes (d) amino acid molecules (e) photosynthetic

molecules

acids linked by hydrolysis (d) carbohydrates with a hydrogen bond holding them together (e) none of the

above.

(37) A peptide bond binds___

(a) oxygen to hydrogen in a molecule of water (b) sodium to chloride in salt (c) amino acids together in

proteins (d) is a bond between two monosaccharides (e) none of the above

(38) Which of the following would probably NOT affected when a protein is denatured? (a) primary

structure (b) secondary structure (c) hydrogen bonds (d) tertiary structure (e) All of the above must be

(40) The “primary structure” of a protein refers to ___

structure.

(42) The overall three-dimensional shape of a polypeptide is called the ___

(a) double helix (b) primary structure (c) secondary structure (d) tertiary structure (e) quaternary structure.

(43) How does a protein’s quaternary structure differ from other levels of protein structure?

(a) it involves two or more polypeptide chains. (b) it takes the form of an alpha helix. (c) it is described by

the sequence of amino acids in a polypeptide chain. (d) it depends on interactions among a polypeptide side

groups (e) it takes the form of a pleated sheet.

(a) DNA consists of two strands in a double helix (b) DNA is larger. (c) One of their nitrogen-containing

bases is different (d) They contain different sugars. (e) All of the above are differences.

(46) A nucleotide is made of which of the following chemical components?

(a) a nitrogen-containing base, an amino acid, and a 5-carbon sugar (b) a nitrogen-containing base, an

amino acid, and a phosphate group (c) a nitrogen-containing base, a phosphate group and a sugar (d) a

nitrogen-containing base, a fatty acid, and an amino acid (e) glycerol and fatty acids.

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