101. Saprotrophic bacteria obtain nutrition from:
Answer: C. dead organic matter
Biology Class 11 Unit 6: Prokaryotes MCQs
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102. Saprotrophs break down organic matter by secreting:
Answer: B. extracellular enzymes
103. Example of a saprotrophic bacterium:
Answer: B. Pseudomonas or Azotobacter
104. Rickettsia is an obligate:
Answer: B. parasite
105. E. coli is a:
Answer: C. facultative bacterium growing with or without oxygen
106. Bacteria requiring low concentration of oxygen are:
Answer: D. microaerophilic
107. An example of a microaerophilic bacterium is:
Answer: D. Campylobacter
108. Cyanobacteria perform photosynthesis in:
Answer: B. thylakoids
109. Phycobiliproteins in cyanobacteria include:
Answer: B. phycocyanin and phycoerythrin
110. Other photosynthetic bacteria (purple and green) have pigments embedded in:
Answer: B. cell membrane invaginations called chromatophores
111. Other photosynthetic bacteria mostly:
Answer: B. do not produce oxygen and use H2S or organic molecules as electron donors
112. Bacteria reproduce asexually by:
Answer: C. binary fission
113. One bacterium will produce how many bacteria after four generations?
Answer: C. 16
114. Bacterial growth is described as:
Answer: B. exponential (logarithmic)
115. The bacterial growth curve has how many phases?
Answer: C. 4
116. The correct sequence of phases of bacterial growth is:
Answer: B. lag, log, stationary, death
117. During the lag phase the bacteria:
Answer: B. adapt to the new environment
118. In the log phase the bacteria:
Answer: B. divide at the maximum rate
119. In the stationary phase:
Answer: B. the rate of new cell production equals the rate of cell death
120. The death phase is characterized by:
Answer: C. increased death rate with cells stopping multiplication
121. Stationary phase occurs due to:
Answer: B. exhaustion of nutrients, accumulation of toxic wastes and oxygen depletion
122. The doubling time of E. coli is about:
Answer: B. 20 minutes
123. The doubling time of Mycobacterium tuberculosis is more than:
Answer: C. 24 hours
124. In binary fission DNA replication begins at the:
Answer: B. origin of replication, proceeding bidirectionally
125. DNA of a bacterium is located in the:
Answer: B. nucleoid region
126. Sexual reproduction in bacteria is:
Answer: B. genetic recombination
127. Genetic recombination in bacteria occurs by:
Answer: B. conjugation, transduction and transformation
128. Bacterial conjugation was demonstrated in 1946 by:
Answer: C. Lederberg and Tatum
129. In conjugation the genetic material usually transferred is a:
Answer: B. plasmid
130. Conjugation takes place through a:
Answer: C. bridge-like connection (pilus)
131. The bacterium that gives the DNA is called the:
Answer: B. donor
132. Transfer of bacterial DNA by bacteriophages is called:
Answer: C. transduction
133. Absorption of naked DNA fragments from the environment into a cell is:
Answer: C. transformation
134. Cells that take up DNA in transformation are called:
Answer: B. transformed cells
135. Bacteria are described as clonal because they:
Answer: B. inherit identical copies of the parent's genes
136. Mutations in bacteria arise from:
Answer: B. errors in DNA replication or exposure to mutagens
137. Nitrogen fixing bacteria in legumes belong to genus:
Answer: B. Rhizobium
138. Nitrosomonas and Nitrobacter convert:
Answer: B. ammonia to nitrate (nitrification)
139. Denitrifying bacteria convert:
Answer: C. nitrates into nitrogen gas
140. Bacteria and fungi as decomposers give rise to:
Answer: B. humus
141. Humus improves the soil by enriching nutrients and:
Answer: B. enhancing capacity to retain moisture
142. Bacteria which synthesize vitamin K and vitamin B12 in the gut include:
Answer: C. Escherichia coli
143. Acetic acid for vinegar production is made using:
Answer: B. bacteria
144. Streptomycin, Auromycin and Tetramycin are antibiotics obtained from:
Answer: C. actinomycetes (bacteria)
145. Biogas is mainly composed of:
Answer: C. methane (about 54 to 70 percent)
146. Single cell protein can be obtained from:
Answer: C. bacteria, yeast, fungi and algae
147. Hershey and Chase in 1952 used T2 bacteriophage to prove that:
Answer: B. DNA is the hereditary material
148. Organisms with a foreign gene inserted into them are called:
Answer: C. transgenic organisms
149. Insulin and growth hormone are produced using:
Answer: B. genetically engineered bacteria
150. Bacteria used to clean oil spills show:
Answer: B. bioremediation
About Biology Class 11 Unit 6 MCQs (Federal Board)
These 227 Biology MCQs cover Class 11 Unit 6: Prokaryotes of the Federal Board (FBISE) HSSC-I (1st Year / Class 11) syllabus. They are SLO-based MCQs as per the new pattern for FBISE exams. Each question has four options and the correct answer is shown, so you can practise for the annual examination and find the topics you still need to revise. The questions are split over 5 pages of 50. Use the Print button to save this chapter as a PDF.