Exam (elaborations)
Biod 171 all exams exam 1 2021
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- University Of South Africa (Unisa)
Biod 171 all exams exam 1 2021
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Stuvia.com - The Marketplace to Buy and Sell your Study MaterialBIOD 171 ALL EXAMS EXAM 1 2021
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Exam 1.
True or False: A virus is considered a microorganism.
False. Viruses are not living and as such are not considered microorganisms. Viruses can,
however, be classified as microbes, a more general term that includes microorganisms and
viruses.
2. What is the smallest biological unit of life?
A cell.
3. At a generalized level, all cells are comprised of what?
Macromolecules*
*A student may also answer: Proteins, Lipids, Nucleic acids and Polysaccharides but they
must answer with all four to be fully correct.
How many different types of amino acids are available from which to make proteins?
20
2. Define an essential amino acid.
An essential amino acid cannot be produced by the human body and as such must be take in
from the environment through alternative sources (i.e) food.
Exam Page 3
1. What are the two major types of nucleic acids and their roles?
DNA (deoxyribonucleic acid): Contains the genetic material as well as heredity characteristics
found in living organisms. RNA (ribonucleic acid): its role is for decoding the sequence of
heredity information found in DNA
Answer Key
1. What are the two major types of nucleic acids and their roles?
There are two major types of nucleic acids: DNA (deoxyribonucleic acid) and RNA
(ribonucleic acid). Nucleic acids are chemical molecules that carry genetic information within
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the cell. DNA contains a vast amount of hereditary information and is responsible for the
inheritable characteristics of living organisms. RNA is responsible for deciphering the
hereditary information in DNA and using it to synthesize proteins.
Exam Page 4
Answer Key
1. Complete the following RNA strand and indicate how many bonds are formed for each
complementary pair:
3’ GGUCAUCG 5’
5’ CC AGC 3’
3’ GGUCAUCG 5’
5’ CCAGUAGC 3’
There are 2 bonds formed between A and U, and 3 bonds between G and C.
Exam Page 5
Answer Key
1. The plasma membrane (select all that are true):
A. Only restricts movement of materials into the cell
B. Is often a bilayer comprised of lipids
C. Cannot prevent essential nutrients from escaping
D. Contains hydrophobic tails pointing inward
B and D
2. Carbon, Hydrogen and Oxygen atoms come together to form what primary macromolecule? Give
an example.
Polysaccharides. Glucose, sucrose and cellulose are all acceptable answers.
Exam Page 6
Answer Key
1. True of False: Eukaryotic cells do not have a nucleus
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False. Eukaryotic cells do have a nucleus (prokaryotic cells do not).
2. True or False: Prokaryotic cells can be subdivided into Bacteria and Archaea.
True
3. Describe the 4 basic bacterial morphologies.
Coccus (round/spherical), bacillus (rod), vibrio (curved rod) or spirillum (spiral/corkscrew).
4. True or False: Archaea, a eukaryotic class of microorganisms, are capable of surviving harsh
environments.
False. Archaea are prokaryotic bacteria capable of surviving harsh environments.
Exam Page 7
Answer Key
1. Which of the following microorganisms are considered to be Eukarya? Select all that apply.
A. Animalia
B. Plantae
C. Fungi
D. Protista
A,B,C,D
2. True of False: All multicellular microorganisms classified as Animalia are heterotropic.
True
3. Microorganisms classified as Plantae obtain most of their energy by converting _____ energy into
_______ energy.
Light (sunlight); chemical (sugars)
Exam Page 8
Answer Key
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