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10 Mar 2020, 10:52
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Question 1
B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
15%
(low)
Question Stats:
80% (02:16) correct
20%
(02:23) wrong
based on 443
sessions
History
Date
Time
Result
Not Attempted Yet
Question 2
C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
25%
(medium)
Question Stats:
69% (00:58) correct 31%
(01:11) wrong
based on 418
sessions
History
Date
Time
Result
Not Attempted Yet
Question 3
A
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
55%
(hard)
Question Stats:
50% (01:15) correct 50%
(01:19) wrong
based on 422
sessions
History
Date
Time
Result
Not Attempted Yet
Question 4
B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
95%
(hard)
Question Stats:
28% (01:13) correct 72%
(01:03) wrong
based on 408
sessions
History
Date
Time
Result
Not Attempted Yet
Researchers are finding that in many ways an individual bacterium is more analogous to a component cell of a multicellular organism than it is to a free-living, autonomous organism. Anabaena, a freshwater bacteria, is a case in point. Among photosynthetic bacteria, Anabaena is unusual: it is capable of both photosynthesis and nitrogen fixation. Within a single cell, these two biochemical processes are incompatible: oxygen, produced during photosynthesis, inactivates the nitrogenase required for nitrogen fixation. In Anabaena communities, however, these processes can coexist. When fixed nitrogen compounds are abundant, Anabaena is strictly photosynthetic and its cells are all alike. When nitrogen levels are low, however, specialized cells called heterocysts are produced which lack chlorophyll (necessary for photosynthesis) but which can fix nitrogen by converting nitrogen gas into a usable form. Submicroscopic channels develop which connect the heterocyst cells with the photosynthetic ones and which are used for transferring cellular products between the two kinds of Anabaena cells.
1. According to the passage, which of the following statements is true of bacteria that engage in photosynthesis?
(A) They eventually become two autonomous cells.
(B) They cannot normally also engage in nitrogen fixation.
(C) Oxygen normally inactivates them.
(D) Cellular products are constantly transferred between such bacteria.
(E) They normally lack chlorophyll.
(A) They eventually become two autonomous cells.
(B) They cannot normally also engage in nitrogen fixation.
(C) Oxygen normally inactivates them.
(D) Cellular products are constantly transferred between such bacteria.
(E) They normally lack chlorophyll.
2. It can be inferred from the passage that cell differentiation within Anabaena is regulated by the
(A) amount of oxygen Anabaena cells produce
(B) season of the year
(C) amount of fixed nitrogen compounds available
(D) number of microscopic channels uniting Anabaena cells
(E) amount of chlorophyll in Anabaena cells
(A) amount of oxygen Anabaena cells produce
(B) season of the year
(C) amount of fixed nitrogen compounds available
(D) number of microscopic channels uniting Anabaena cells
(E) amount of chlorophyll in Anabaena cells
3. The passage supports which of the following inferences about heterocysts?
(A) Heterocysts do not produce oxygen.
(B) Nitrogen gas inactivates heterocysts.
(C) Chlorophyll increases the productivity of heterocysts.
(D) Heterocysts allow nitrogen fixation and photosynthesis to occur in the same cell.
(E) Heterocysts are more important for Anabaena's functioning than are photosynthetic cells.
(A) Heterocysts do not produce oxygen.
(B) Nitrogen gas inactivates heterocysts.
(C) Chlorophyll increases the productivity of heterocysts.
(D) Heterocysts allow nitrogen fixation and photosynthesis to occur in the same cell.
(E) Heterocysts are more important for Anabaena's functioning than are photosynthetic cells.
4. The author uses the example of Anabaena to illustrate the
(A) the uniqueness of bacteria among unicellular organisms
(B) inadequacy of an existing view of bacteria
(C) ability of unicellular organisms to. engage in photosynthesis
(D) variability of a freshwater bacteria
(E) the difficulty of investigating even the simplest unicellular organisms
(A) the uniqueness of bacteria among unicellular organisms
(B) inadequacy of an existing view of bacteria
(C) ability of unicellular organisms to. engage in photosynthesis
(D) variability of a freshwater bacteria
(E) the difficulty of investigating even the simplest unicellular organisms
14 Jun 2020, 04:20
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1. According to the passage, which of the following statements is true of bacteria that engage in photosynthesis?
(A) They eventually become two autonomous cells.
(B) They cannot normally also engage in nitrogen fixation.
Anabaena is unusual among bacteria that engage in photosynthesis in the sense that they can also engage in nitrogen fiation. It meant normally bacteria cannot do both.
(C) Oxygen normally inactivates them.
(D) Cellular products are constantly transferred between such bacteria.
(E) They normally lack chlorophyll. Not true.Chlorophyll is required for photosynthesis.
2. It can be inferred from the passage that cell differentiation within Anabaena is regulated by the
(A) amount of oxygen Anabaena cells produce
(B) season of the year
(C) amount of fixed nitrogen compounds available
(E) amount of chlorophyll in Anabaena cells. Not relevant
3. The passage supports which of the following inferences about heterocysts?
(A) Heterocysts do not produce oxygen.
Since Heterocysts lack Chlorophyll, they cannot/do not produce Oxygen.
(C) Chlorophyll increases the productivity of heterocysts.
(D) Heterocysts allow nitrogen fixation and photosynthesis to occur in the same cell. heterocysts are specialized cells produced when Nitrogen levels are low. Theylack Chlorophyll and hence cannot allow photosynthesis.
(E) Heterocysts are more important for Anabaena's functioning than are photosynthetic cells.
4. The author uses the example of Anabaena to illustrate the
(A) the uniqueness of bacteria among unicellular organisms. Uniqueness of Anabaena among photosynthetic bacteria is mentioned in the passage. Not that of bacteria among unicellular organisms
(B) inadequacy of an existing view of bacteria
(D) variability of a freshwater bacteria
(E) the difficulty of investigating even the simplest unicellular organisms
(A) They eventually become two autonomous cells.
(B) They cannot normally also engage in nitrogen fixation.
Anabaena is unusual among bacteria that engage in photosynthesis in the sense that they can also engage in nitrogen fiation. It meant normally bacteria cannot do both.
Quote:
(C) Oxygen normally inactivates them.
(D) Cellular products are constantly transferred between such bacteria.
(E) They normally lack chlorophyll. Not true.Chlorophyll is required for photosynthesis.
2. It can be inferred from the passage that cell differentiation within Anabaena is regulated by the
(A) amount of oxygen Anabaena cells produce
(B) season of the year
(C) amount of fixed nitrogen compounds available
Quote:
(D) number of microscopic channels uniting Anabaena cells. There is no mention of number of microscopic channels uniting Anabaena cells in the passage
(E) amount of chlorophyll in Anabaena cells. Not relevant
3. The passage supports which of the following inferences about heterocysts?
(A) Heterocysts do not produce oxygen.
Since Heterocysts lack Chlorophyll, they cannot/do not produce Oxygen.
Quote:
(B) Nitrogen gas inactivates heterocysts.
(C) Chlorophyll increases the productivity of heterocysts.
(D) Heterocysts allow nitrogen fixation and photosynthesis to occur in the same cell. heterocysts are specialized cells produced when Nitrogen levels are low. Theylack Chlorophyll and hence cannot allow photosynthesis.
(E) Heterocysts are more important for Anabaena's functioning than are photosynthetic cells.
4. The author uses the example of Anabaena to illustrate the
(A) the uniqueness of bacteria among unicellular organisms. Uniqueness of Anabaena among photosynthetic bacteria is mentioned in the passage. Not that of bacteria among unicellular organisms
(B) inadequacy of an existing view of bacteria
Quote:
(C) ability of unicellular organisms to. engage in photosynthesis
(D) variability of a freshwater bacteria
(E) the difficulty of investigating even the simplest unicellular organisms
General Discussion
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10 Mar 2020, 19:38
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Can some one xplain answer for Q4
Option A relates more to the answer than option B
As given in the passage.
"Researchers are finding that in many ways an individual bacterium is more analogous to a component cell of a multicellular organism than it is to a free-living, autonomous organism"
Option A relates more to the answer than option B
As given in the passage.
"Researchers are finding that in many ways an individual bacterium is more analogous to a component cell of a multicellular organism than it is to a free-living, autonomous organism"
