HW 3 Ch 04 Activity: Prokaryotic Cell Structure and Function

_____ are surface appendages that allow a bacterium to stick to a surface. A. Fimbriae B. Cell walls C. Mitochondria D. Ribosomes E. Flagella

Answer: A. Fimbriae Fimbriae enable bacterial cells to stick to a surface.

The _____ is the bacterial structure that acts as a selective barrier, allowing nutrients to enter the cell and wastes to leave the cell. A. plasma membrane B. nucleoid region C. ribosome D. fimbriae E. cell wall

Answer: A. plasma membrane The plasma membrane is selectively permeable.

What is the function of a bacterium's capsule? A. protection B. protein synthesis C. propulsion D. DNA storage

Answer: A. protection A bacterium's capsule has a protective role.

In a bacterium, where are proteins synthesized? A. ribosomes B. nucleus C. peroxisome D. nucleoid region E. capsule

Answer: A. ribosomes Ribosomes are involved in the manufacture of polypeptides (proteins).

The structure that regulates the passage of material into and out of this bacterial cell is indicated by the letter _____. A B C D E

Answer: C

What name is given to the rigid structure, found outside the plasma membrane, that surrounds and supports the bacterial cell? A. capsule B. fimbriae C. cell wall D. flagella E. nucleoid region

Answer: C. cell wall The cell wall is a rigid supporting structure.

The DNA-containing region of this bacterial cell is indicated by the letter _____.

Answer: D The nucleoid region contains DNA.

Where is a bacterial cell's DNA found? A. ribosomes B. nucleus C. peroxisome D. nucleoid region E. capsule

Answer: D. nucleoid region Bacteria lack a nucleus; their DNA is found in the nucleoid region.