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Unit 1 Viruses and Bacteria
Comprehension Check Up
1. The word its in the passage refers to
(A) cell (B) bacterium (c) membrane (D) make-up
2. Which of the sentences below best expresses the essential information in the highlighted
sentence in the passage? Incorrect choices change the meaning in important ways or leave
out essential information.
(A) As the cell grows larger, it splits into two separate cells, each with identical genetic
material from the original cell.
(B) When the cell splits in two, it grows large enough so that its DNA can replicate and
create a new cell.
(C) DNA is replicated within the cell, at which point the cell grows larger and eventually splits
into two different cells.
(D) Cells reproduce by dividing themselves into two separate cells with different genetic
materials.
3. In paragraph 3, what is implied about the reproduction of viruses?
(A) It always reproduces the same number of viruses.
(B) It occurs through the division of a single cell.
(C) It can go on indefinitely if there is a host.
(D) It can occur outside a host cell.
4. Look at the four squares [A~D] that indicate where the following sentence could be added
to the passage. Where would the sentence best fit? [A]
Most types of bacteria are beneficial to humans, and not all viruses carry disease,
but both can be harmful when they disrupt the normal functioning of the human
body.
-7-
Comprehension Check Up
1. The word its in the passage refers to
(A) cell (B) bacterium (c) membrane (D) make-up
2. Which of the sentences below best expresses the essential information in the highlighted
sentence in the passage? Incorrect choices change the meaning in important ways or leave
out essential information.
(A) As the cell grows larger, it splits into two separate cells, each with identical genetic
material from the original cell.
(B) When the cell splits in two, it grows large enough so that its DNA can replicate and
create a new cell.
(C) DNA is replicated within the cell, at which point the cell grows larger and eventually splits
into two different cells.
(D) Cells reproduce by dividing themselves into two separate cells with different genetic
materials.
3. In paragraph 3, what is implied about the reproduction of viruses?
(A) It always reproduces the same number of viruses.
(B) It occurs through the division of a single cell.
(C) It can go on indefinitely if there is a host.
(D) It can occur outside a host cell.
4. Look at the four squares [A~D] that indicate where the following sentence could be added
to the passage. Where would the sentence best fit? [A]
Most types of bacteria are beneficial to humans, and not all viruses carry disease,
but both can be harmful when they disrupt the normal functioning of the human
body.
-7-
