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GGH1502 QUESTIONS & ANSWERS PREP
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- University Of South Africa (Unisa)
GGH1502 QUESTIONS & ANSWERS PREP
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Question 11. An atom is defined as a smallest particle of ____
i) A compound that can take part in chemical reaction
ii) An element that can take part in chemical reaction
iii) A molecule that with other molecules
iv) An isotope that can take part in chemical reaction
v) A compound that reacts with other compounds
Answer:
● An element that can take part in chemical reaction
2. The three domains of life are____
i) Eukarya, fungi and bacteria
ii) Eukarya, archaea and bacteria
iii) Eukarya, fungi and animalia
iv) Eukarya, archaea and fungi
v) Eukarya, bacteria and animalia
Answer:
● Eukarya, archaea and bacteria
3. Van der Waals interaction is a bond formed by ____
i. Polar positively charged and polar negatively charged atoms
ii. Polar positively charged and non-polar negatively charge atoms
iii. Non-polar positively charged and non-polar negatively charge atoms
iv. Positively charged and negatively charge atoms
v. Non-polar positively charge and negatively charged atoms
Answer:
● Non-polar positively charged and non-polar negatively charge atoms
(Van der Waals interactions: Non-polar covalent bonds may have positively and negatively charged regions
where very weak bonds can be formed when the atoms and molecules are very close together.)
4. Chitin is an example of a _____
i. Polypeptide
ii. Polysaccharide
iii. Fat
iv. Nucleic acid
v. Glycerol
Answer:
● Polysaccharide
(Chitin Structure: The structure is similar to cellulose except that chitin has a nitrogen – containing
appendages in its glucose monomer. Functions: The exoskeleton of arthropods, (insects, spiders ,
,crustaceans and related animals is composed of chitin. In fungi, it is used as the building material for their
cell walls.)
5. The electron configuration 1s22s22p6 belongs to____
i. Carbon
ii. Oxygen
iii. Nitrogen
iv. Neon
v. Magnesium
Answer:
● Neon
6. Ribosomes are responsible for____
i. Protein synthesis
ii. Digestive compartments
iii. Photosynthesis
iv. Controlling the centre of the cell
v. The removal of waste from the cell
Answer:
● Protein synthesis
7. The mass number refers to_____
i) The number of protons in an atom
ii) The combined number of protons and neutrons in an atom
iii) The number of electrons in an atom
iv) The combined number and protons and electrons in an atom
v) The number of neutrons and electrons in an atom
Answer:
● The combined number of protons and neutrons in an atom
8. Chloroplasts are responsible for:
i. The shipping and receiving centre
ii. Digestive compartments
iii. Photosynthesis
iv. Controlling the centre of the cell
v. Protein synthesis
Answer:
● Photosynthesis
9. In DNA double helix, adenine pairs with ______ and guanine pairs with ______
i. cytosine, thymine
ii. guanine, adenine
iii. uracil, cytosine
, iv. thymine, cytosine
v. cytosine, uracil
Answer:
● thymine, cytosine
10. Which statement best describes the isotonic solution?
i. It is a solution with a high solutes concentration and a low water concentration.
ii. It is a solution with a high water concentration and low solutes concentration.
iii. It is a solution with a balanced water and solutes concentration.
iv. It is a solution with a high water concentration and a low solutes concentration, hence
producing constant movement of water.
v. Both i. and ii. are correct.
Answer:
● It is a solution with a balanced water and solutes concentration.
11. Which statement best describes chemical work?
i. The beating of cilia, contraction of muscles.
ii. Movement of chromosomes during cellular reproduction.
iii. The pumping of substances across membranes against spontaneous movement.
iv. The pushing driving of endergonic reactions, such as the synthesis of polymers from
monomers.
v. The diffusion of substances across the selective permeable membrane
Answer:
● The pushing driving of endergonic reactions, such as the synthesis of polymers from monomers.
12. The atomic number refers to____
i. The number of protons in an atom
ii. The combined number of protons and neutrons of an atom
iii. The number of electrons in an atom
iv. The combined number of protons and electrons of an atom
v. The number of neutrons and electrons.
Answer:
● The number of protons in an atom
13. A 9:3:3:1 phenotypic ratio is characteristic of the____
i. F1 generation of a monohybrid cross
ii. F2 generation of a monohybrid cross
iii. F1 generation of a dihybrid cross
iv. F2 generation of a dihybrid cross
v. F3 generation with dihybrid cross
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