13 Jun Which of the following bacterial phyla contain Gram-positive
Question
This is a study guide for a test and I need to correct answers so I can study for the test. I will post the entire 20 questions any help I can get is appreciated.
1) Which of the following bacterial phyla contain Gram-positive members that are the cause of several human diseases?
A) Firmicutes C) Actinobacteria
B) Cyanobacteria D) Proteobacteria
__2) Which of the following proteobacteria are harmless to humans?
A) Salmonella C) Vibrio
B) Helicobacter D) Agrobacterium
__3) Which bacterial genus contains members who can perform nitrogen fixation within the roots of certain plants?
A) Agrobacterium C) Nitrosomonas
B) Rhizobium D) Neisseria
__4) Cyanobacteria…
A) are probably responsible for creating our oxygen-rich atmosphere
B) possess a great deal of structural diversity
C) can be harmful to humans
D) A & B Only
E) A, B, & C
__5) About ____% of prokaryotic genes have been involved in horizontal gene transfer at some point in their history. A) 90 B) 80 C) 60 D) 40
__6) True/False: Mitochondria, a eukaryotic cellular organelle, most likely originated from a prokaryotic proteobacteria.
__7) Bacteria and archaeans are similar in all of the following ways EXCEPT:
A) they are both relatively small compared to eukaryotic cells
B) they both reproduce rapidly
C) they both have complex membrane-bound organelles
D) they both lack a true nucleus
__8) Thylakoids enable cyanobacteria to perform…
A) phagocytosis C) aerobic cellular respiration
B) photosynthesis D) protein synthesis
__9) Gas vesicles collapse when cyanobacteria…
A) want to rise in the water to perform more photosynthesis
B) want to sink deeper in the water to harvest inorganic minerals
C) want to rise in the water to harvest inorganic minerals
D) want to sink deeper in the water to perform photosynthesis
__10) Magnetosomes allow bacteria to…
A) navigate long distances across the ocean for breeding purposes
B) locate & attract metals which they consume for energy
C) locate low-oxygen habitats
D) avoid dangerous predators by picking up electrical fields
__11) All of the following terms describe bacterial shapes EXCEPT:
A) cocci C) trapezius E) spirilli
B) vibrios D) bacilli
__12) Mucilage helps bacterial colonies survive by…
A) providing a protective barrier D) binding mineral nutrients
B) allowing cells to stick together E) A, B, C, & D
C) allowing cells to float
__13) Which of the following terms/descriptions does NOT belong with the others?
A) Gram-positive D) vulnerable to penicillin
B) thick peptidoglycan layer E) Firmicutes
C) pink
__14) Prokaryotic flagella…
A) consist of microtubules in a 9 + 2 arrangement
B) bend and straighten repeatedly D) consist of a filament, hook,
C) contain the motor protein dynein & motor
__15) A microbiologist counts 7 bacterial colonies growing in an agar plate several days after a water sample was taken from a nearby lake. How many bacterial cells were present in the water sample? A) 7 B) 10 C) 5,000,000 D) Impossible to estimate.
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