BLG1501 EXAM PACK 2022. An atom is defined as the smallest particle of _____
A. a compound that can take part in chemical reaction.
B. an element that can take part in chemical reaction.
C. a molecule that reacts with other molecules.
D. an isotope that take part in chemical reaction.
E. a co...
1.1 An atom is defined as the smallest particle of _____
A. a compound that can take part in chemical reaction.
B. an element that can take part in chemical reaction. ✔
C. a molecule that reacts with other molecules.
D. an isotope that take part in chemical reaction.
E. a compound that react with other compounds.
1.2 The three domains of life are _____
A. eukarya, fungi and bacteria.
B. eukarya, archaea and bacteria. ✔
C. eukarya, fungi and animalia.
D. eukarya, archaea and fungi.
E. eukarya, bacteria and animalia
1.3 The correct definition of isotopes is _____
A. atoms of the different elements that have the same number of neutrons,
but differ in the number of protons.
B. atoms of the same element containing the same number of protons, but
differ in the number of electrons.
C. atoms of the same element containing the same number of protons,
but differ in the number of neutrons. ✔
D. atoms of the same element containing the same number of electrons, but
differ in the number of neutrons.
E. atoms of different elements that have the same number of neutrons, but
differ in the number of electrons.
1.4 Van der Waals interaction is a bond formed by _____
A. polar positively charged and polar negatively charged atoms.
B. polar positively charged and non-polar negatively charged atoms.
C. non-polar positively charged and non-polar negatively charged
atoms.✔
D. positively charged and negatively charged atoms.
E. non-polar positively charged and negatively charged atoms.
1.5 Chitin is an example of a _____
A. polypeptide.
B. polysaccharide. ✔
C. fat.
D. nucleic acid.
E. glycerol.
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1.6 The electron configuration 1s22s22p4, belongs to _____
A. carbon.
B. oxygen. ✔
C. nitrogen.
D. neon.
E. magnesium.
1.7 Ribosomes are responsible for _____
A. protein synthesis. ✔
B. digestive compartments.
C. photosynthesis.
D. controlling the centre of the cell.
E. the removal of waste from the cell.
1.8 The mass number refers to _____
A. the number of protons in an atom.
B. the combined number of protons and neutrons in an atom. ✔
C. the number of electrons in an atom.
D. the combined number of protons and electrons in an atom.
E. the number of neutrons and electrons in an atom.
1.9 Chloroplasts are responsible for _____
A. the shipping and receiving centre.
B. digestive compartments.
C. photosynthesis. ✔
D. controlling the centre of the cell.
E. protein synthesis.
1.10 In DNA, double helix, adenine pairs with _____, and guanine pairs with _____
A. cytosine, thymine.
B. guanine, adenine.
C. uracil, cytosine.
D. thymine, cytosine. ✔
E. cytosine, uracil.
Total: 20
Question 2
2.1 Describe the structure and functions of four polysaccharides. (8)
Answer:
Starch = Glucose polymer that is a storage polysaccharide in plants.
Helical glucose polymer with alpha 1-4 linkages
Glycogen = Glucose polymer that is a storage polysaccharide in animals.
Large glucose polymer that is more highly branched (alpha 1-4 and 4-6 linkages)
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than amylopectin
Cellulose = Cellulose reinforces plant cell walls. Hydrogen bonds hold together
parallel cellulose molecules in bundles of microfibrils. Linear unbranched polymer of
D-glucose in (alpha 1-4, beta 4-6) linkages.
Chitin = A structural polysaccharide that is a polymer of an amino sugar
Forms exoskeletons of arthropods and found as building material in the cell walls of
some fungi.
2.2 Define the term "buffer". In the definition, refer to suitable examples of a
buffer and indicate its application in living systems. (5)
Answer:
Buffer = Substance that minimizes large sudden changes in pH.
Work by accepting H+ ions from solution when they are in excess and by donating
H+ ions to the solution when they have been depleted
Example: Bicarbonate buffer
2.3 Compare and contrast the processes of fermentation and cellular
respiration. (12)
Answer:
Fermentation Cellular respiration
The final electron acceptor is an organic The final electron acceptor is oxygen
molecule pyruvate (lactic acid
fermentation) or acetaldehyde (alcohol
fermentation)
Harvests less energy Harvests more energy
Yields 2 ATPs Yields 38 ATPs
Anaerobic conditions Aerobic conditions
Question 3
3.1 Explain how edges and corridors can strongly influence landscape
biodiversity. (6)
Answer:
Boundaries (edges) between ecosystems and along prominent features within
ecosystems have unique sets of physical conditions and communities of species.
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