BIOLOGY CONNECT AN AUSTRALIAN FOCUS 5Th Ed By ROBERT KNOX - Test Bank - Updated

Chapter 02 Testbank

Student: ___________________________________________________________________________

1. Individual carbon atoms may form four covalent bonds with other atoms. This allows them to form
 
A. inorganic molecules.

B. linear molecules.

C. branched molecules.

D. both linear and branched molecules.

E. reactive molecules.

2. Functional groups attached to a carbon-hydrogen core provide characteristic chemical properties. Which of the following statements about functional groups is INCORRECT?
 
A. A carboxyl group may lose an electron and provide a negative charge to the group.

B. A phosphate group in water readily loses a proton to form an unstable ion.

C. A hydroxyl group (-OH) is polar and readily forms hydrogen bonds.

D. A thiol group (-SH) does not form hydrogen bonds.

E. An amino group in water readily accepts a H+ ion to become positively charged.

3. DNA is the biomolecule that provides the information for that organism. Which of the following statements about DNA is CORRECT?
 
A. All cells in an organism have the same DNA, but differently expressed, providing specific cellular functions.

B. Nucleic acid molecules consist of long chains of nucleotides joined by a glycosidic bond between the monosaccharide and the phosphate group.

C. In DNA, the monosaccharide is 2'-ribose and the bases are adenine, cytosine, guanine and thymine.

D. DNA consists of two strands, held together by specific complementary interactions between the phosphate groups.

E. The ability of the DNA to replicate itself with a high degree of precision is due to the ability of the bases on different nucleic acid chains to recognise each other by specific covalent bonding.

4. Which of the following molecules is not found in RNA?
 
A. Adenine

B. Cytosine

C. Guanine

D. Thymine

E. Uracil

5. The diversity of organic biomolecules is possible because
 
A. carbon atoms are able to hydrogen bond in water and stabilise structures.

B. carbon atoms readily interact with nitrogen and phosphorus atoms.

C. carbon atoms are able to form single, double and triple bonds to form stable molecules.

D. carbon atoms are able to form ionic bonds with many different atoms.

E. carbon atoms are able to form four strong covalent bonds with carbon and other elements.

6. Phospholipids are important
 
A. as hormones.

B. as a component of deoxyribonucleic acid.

C. in the formation of cell membranes.

D. as components of ribosomes.

E. for intracellular transport of energy.

F. attraction between positively and negatively charged ions of the same element.

7. 

Which functional groups are present on this molecule?
 
 

 
A. Hydroxyl and carbonyl

B. Carboxyl and carbonyl

C. Hydroxyl and thiol

D. Hydroxyl and carboxyl

E. Amino and carboxyl

8. Which of the following is not a polymer of smaller units?
 
A. Protein

B. Deoxyribonucleic acid

C. Lipid

D. Carbohydrate

E. Glycoprotein

9. Which of the following is not an important organic molecule in human cells?
 
A. Glycogen

B. Phospholipids.

C. Starch

D. Amino acids

E. Lactose