QUIZ ONLINE UJI NYALI 3 STRUKTUR SEL PROKARIOT
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SELAMAT UNTUK ASTA YANG TELAH MERAIH NILAI TERBAIK KUIS MINGGUAN KEDUA. PERTAHANKAN TERUS YA SEMANGAT BELAJARNYA. Saya sangat berterima kasih jika Anda bersedia menulis komentar di kotak "comments" setelah Anda menyelesaikan Quiz ini.
- 1.The plasma membrane and most other membranes are composed of a lipid bilayer in which integral proteins are buried
- A.
TRUE
- B.
FALSE
- 2.Procaryotic cells are usually smaller than eucaryotic cells.
- A.
TRUE
- B.
FALSE
- 3.Another common bacterial shape is that of a rod, often called ________
- A.
Coccus
- B.
Bacillus
- C.
Pleomorphic
- 4.Most procaryotes have strong cell walls that give them shape.
- A.
True
- B.
False
- 5.The most commonly encountered bacteria are roughly spherical. The microbiological term describing this shape is _________
- A.
Coccus
- B.
Bacillus
- C.
Pleomorphic
- 6.The significance of the plasma membrane is that
- A.
It selectively allows some molecules to pass into the organism
- B.
It prevents movement of molecules out of the organism
- C.
It is the site of protein synthesis
- D.
All of the above
- 7.What is a plasmid?
- A.
Self-replicating segment of double stranded DNA
- B.
Self-replicating segment of single stranded RNA
- C.
A bacterial chromosome
- 8.Some bacteria are considered pleomorphic. This means
- A.
They are shaped like bent rods
- B.
They have a corkscrew shape
- C.
They do not have just one shape
- D.
They are not either bacilli or cocci.
- 9.Gas vesicles in bacteria
- A.
Help move cells to optimal nutrient levels.
- B.
Store oxygen for growth anaerobically
- C.
Are bounded by a lipid bilayer membrane.
- D.
Are bounded by a membrane impervious to gas
- 10.Magnetostomes in bacteria
- A.
Help cells attach to metal objects.
- B.
Help cells to magnetically attach to each other
- C.
Help cells to float on the surface of fresh water ponds
- D.
Help cells to orient in the earth's magnetic field
- 11.The 70S procaryotic ribosomes consist of
- A.
Two 40S subunits
- B.
A 50S and a 30S subunit
- C.
A 40S and a 30S subunit
- D.
A 50S and a 20S subunit.
- 12.
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Gram positive cells- A.
Have a second, outer membrane that helps retain the crystal violet stain
- B.
Have multiple layers of peptidoglycan that help retain the crystal violet stain
- C.
Have a thick capsule that traps the crystal violet stain
- D.
Have a periplasmic space that traps the crystal violet.
- 13.The outer membrane of Gram negative cells is more permeable than the plasma membrane because
- A.
LPS is larger than most membrane phospholipids
- B.
Lipoproteins stretch the outer membrane
- C.
Porin proteins establish holes in the outer membrane.
- D.
The core polysaccharide spans the lipid bilayer
- 14.The most important role of the prokaryotic cell wall is to
- A.
Maintain the shape of the cell
- B.
Protect the cell from osmotic pressures
- C.
Prevent ions from diffusing away from the cell
- D.
Block the effects of antibiotics like penicillin
- 15.Fimbriae
- A.
Attach bacteria to various surfaces
- B.
Cause bacteria move through fluids
- C.
Sense changes in nutrient concentration
- D.
Are pathways for the secretion of exoenzymes
- 16.A bacillus bacterium with a single flagellum at each end is described as
- A.
Monotrichous
- B.
Amphitrichous
- C.
Lophotrichous
- D.
Peritrichous
- 17.Which of the following is not true about bacterial flagella?
- A.
Most of their length consists of a hollow, rigid protein tube
- B.
They are constructed largely of a single protein called flagellin
- C.
They spin like wheels, either clockwise or counterclockwise
- D.
They use cytoplasmic ATP as their primary energy source.
- 18.Bacteria accomplish chemotaxis by
- A.
Steering toward better growth conditions.
- B.
Making long, uninterrupted runs when conditions are good.
- C.
Frequently stopping and tumbling to better sense good conditions.
- D.
Stopping movement when conditions are good
- 19.The most important role of the prokaryotic cell wall is to
- A.
Maintain the shape of the cell
- B.
Protect the cell from osmotic pressures
- C.
Prevent ions from diffusing away from the cell.
- D.
Block the effects of antibiotics like penicillin
- 20.What is the purpose of bacterial endospores?
- A.
Allow the bacterium to make hundreds of "seeds" to spread on the wind
- B.
Help the bacterium to differentiate into faster growing stages of bacteria
- C.
Allow the bacterium to survive the absence of oxygen
- D.
Allow the bacterium to survive extended periods of heat or dryness.
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