MCB 150 Lecture 2

d) The cell wall is a tough, fibrous layer that protects the cell and gives it shape and rigidity.

For prokaryotic cells, which statement is correct concerning how the structure of a particular cell component correlates with its function? a) The cell wall represents inholdings of the plasma membrane that protect the cell and give it shape and rigidity. b) Photosynthetic membranes are composed of cross linked polymers like peptidoglycan that provide extensive surface area for photosynthesis. c) Photosynthetic membranes contain magnetite that allows the cell to convert magnetic field energy into chemical energy. d) The cell wall is a tough, fibrous layer that protects the cell and gives it shape and rigidity.

a) moved from one species to another

In lateral gene transfer, genes are ______. a) moved from one species to another b) moved from one site to another after the genome is fragmented by restriction enzymes c) moved from their original location to another nearby location in the genome d) transmitted from one generation to another

e) protection

What is the function of a bacterium's capsule? a) DNA storage b) propulsion c) protein synthesis d) adhesion e) protection

c) decreases.

When the size of a cell increases, the surface area/volume ratio a) decreases initially and then begins to increase. b) remains the same. c) decreases. d) increases initially and then begins to decrease. e) increases.

d) nucleoid region

Where is a bacterial cell's DNA found? a) ribosomes b) nucleus c) peroxisome d) nucleoid region e) capsule

d) Bacteria have peptidoglycan in their cell wall.

Which character separates bacteria from archaea? a) Bacteria are unicellular. b) Bacteria do not have a nuclear envelope. c) Bacteria have circular chromosomes. d) Bacteria have peptidoglycan in their cell wall.

b) Cells are the fundamental units of life. d) All cells come from pre-existing cells. f) All organisms are composed of cells.

Which one of the following is a tenet of the Cell Theory? [Note: Keep in mind that just because a given statement is accurate does not necessarily mean it answers the question that has been posed.] Choose all that apply: a) Cells can be either eukaryotes or prokaryotes. b) Cells are the fundamental units of life. c) Eukaryotic cells contain a defined nucleus. d) All cells come from pre-existing cells. e) Prokaryotic cells do not contain membrane-bound organelles. f) All organisms are composed of cells.

d) Fimbriae

_____ are surface appendages that allow a bacterium to stick to a surface. a) Ribosomes b) Mitochondria c) Flagella d) Fimbriae e) Cell walls