BIOD 171 PORTAGE LEARNING
MICROBIOLOGY LECTURE EXAM KEY 1-6
QUESTIONS AND ANSWERS (GRADED A+)
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.
1. 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.
1. What are the two major types of nucleic acids and their roles?
DNA- deoxyribonucleic acid
RNA- Ribonucleic acid
DNA- Cellular life has DNA and a role that DNA has is long-term storage of information, it holds the characteristics of living
RNA- Is the carrier of information in form of amino acid sequence. It converts the information in the DNA and synthesizes
proteins
1. Complete the following DNA strand and indicate how many bonds are formed for each complementary pair:
3’ GGTCATCG 5’
5’ CC AGC 3’
3’ GGTCATCG 5’
5’ CCAGTAGC 3’
There are 2 bonds formed between A and T, and 3 bonds between G and C.
1. The plasma membrane (select all that are true):
A. Restricts movement of materials in and out of the cell
B. Is often a triple layer comprised of lipids
C. Prevents essential nutrients from escaping
D. Contains hydrophobic tails pointing outward
A and C
2. How many carbon atoms are present in the monosaccharide glucose?
A ............................................................................................................................................................................................. 2
B ............................................................................................................................................................................................. 28
C ............................................................................................................................................................................................ 32
D ............................................................................................................................................................................................. 39
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