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Home , Endospore

Chapter 4. and Cell Structure.

1). Which of the following statements is true for the genus Mycoplasma? a) They produce endospores b) They represent some of the largest *c) They lack a d) They are sensitive to penicillin e) They will behave as a gram-positive in a Gram stain

2). What is the term for bacteria that appear as clusters of spheres when examined with the microscope? a) streptobacillus b) *c) staphylococci d) spirochetes e) streptococci

3) Syphilis is caused by a(n) *a) spirochete. b) pleomorphic rod. c) . d) . e) .

4). The major component of the typical bacterial cell wall is a) flagellin b) polysaccharides c) porins *d) e)

5). All of the following are true of gram-positive bacteria except a) They are usually sensitive to penicillin. b) They are often inhibited by basic dyes. c) They have a thick peptidoglycan layer. *d) They have substantial periplasmic space. d) They usually produce .

6). Which bacterial structure helps to prevent phagocytosis? a) b) pili c) flagella d) plasmids *e) capsule

7). Which chemical is found only in the cell wall of gram-negative bacteria? a) b) flagellin *c) d) teichoic acid e) peptidoglycan

8). All of the following are functions of the bacterial plasma membrane except a) group translocation *b) synthesis of intracellular proteins c) production of ATP d) production of chemical for the cell wall e) selective permeability

9). Small, circular pieces of double-stranded DNA inside the bacterial cell are known as *a) plasmids. b) endospores. c) volutin. d) magnetosomes. e) ribosomes.

10) A bacterial cell is found to be motile and resistant to high temperatures and phagocytosis. What structures does this cell probably have? a) flagella, plasmid, pili b) flagella, pili, capsule c) endospore, flagella, cytoplasmic inclusions d) endospore, pili, capsule *e) endospore, flagella, capsule

11). What bacterial structure is resistant to processes that normally kill vegetative cells? a) exotoxins *b) endospores c) ribosomes d) flagella e) pili

12). Sterols can be found in the plasma membrane of a) eucaryotes. b) Mycoplasma. *c) eucaryotes and Mycoplasma. d) most bacteria. e) eucaryotes and most bacteria.

13). Which organelle is involved in making proteins for export? a) rough endoplasmic reticulum b) mitochondria c) lysosome d) *e) Golgi apparatus

14). All of the following are true of eucaryotic flagella except a) They are composed of microtubules. b) They are often longer than the cell. *c) They cause movement by rotating. d) They require energy for movement. e) They contain tubulin.

15) Which eucaryotic organelles contain DNA? a) vacuolesand chloroplasts b) mitochondria and Golgi complex c) chloroplasts and lysosomes d) mitochondria and ribosomes *e) mitochondria and chloroplasts

16). Osmosis is the: a) process of transporting molecules from a region of lower concentration to a region of higher concentration b) transmembrane proteins participate in the movement of substances across membranes c) movement of particles from a higher concentration to lower concentration *d) diffusion of water through a permeable membrane from an area of higher water concentration to a region of lower water concentration

17). A major component of lipopolysaccharide found in the outer membrane of Gram negative cells is: a) peptidoglycan b) DNA *c). lipid A d) RNA e) protein

18). Which of the following would you expect to have more than one chromosome? a) pneumoniae b) difficile c) d) coli *e) Candida albicans

19). Cells are separated from the environment by a membrane. The movement of molecules from a higher concentration to a lower concentration without the help of a carrier protein is termed: *a) facilitated diffusion b) simple diffusion c) osmosis d) transformation e) active transport

20). The outer membrane of Gram negative cells: a) contains teichoic acid *b) contains endotoxin c) contains peptidoglycan d) is important for movement e) is important for bacteriophage attachment