Question

cba 1 (unit 1 & 2)

1. antibiotics function by disabling the metabolic activities of bacterial cells. why do antibiotics destroy bacteria cells but have no effect on viruses?

a. viruses are not alive and do not carry out the life functions that are stopped by antibiotics.
b. viruses are made up of organic molecules that are too small to be targeted by antibiotics.
c. viruses do not possess the protein coat that is targeted by all antibiotics.
d. viruses are more complex than bacterial cells and are able to prevent the damaging effects of antibiotics.

1. viral activity is represented in the diagram below.

what viral replication cycle is taking place in this diagram?
a. mitosis
b. lytic cycle
c. meiosis
d. lysogenic cycle

1. the structure of a virus is simpler than the structure of a cell. select all that a virus may be composed of.

a. a genome
b. a protein coat
c. mitochondrion
d. a lipid membrane
e. cytoplasm

1. which descriptions align to viruses and cells? move the descriptions into the appropriate place in the table to compare viruses and cells.

choices:

Explanation:

1. For question 21: Antibiotics target the life - functions of living cells. Viruses are acellular and not considered alive in the traditional sense, so antibiotics which act on the metabolic activities of living cells have no effect on them.
2. For question 22: In the lytic cycle, a virus infects a host cell, takes over its machinery, replicates, and then causes the cell to burst, releasing new viruses. The diagram shows a virus infecting a host cell, replicating, and the host cell eventually releasing new viruses, which is characteristic of the lytic cycle.
3. For question 23: A virus typically consists of a genome (either DNA or RNA) and a protein coat. Some viruses may also have a lipid membrane (envelope). Mitochondria, cytoplasm are components of cells, not viruses.

Answer:

1. Question 21: A. Viruses are not alive and do not carry out the life functions that are stopped by antibiotics.
2. Question 22: B. Lytic cycle
3. Question 23: A. A genome, B. A protein coat, D. A lipid membrane