Lecture 7 Homework Assignment 10 points Student’s score ________/10
Name:_____________________________________
(Answers can be found in textbook Chapter 7 or in Lecture 7 Powerpoints)
Which of the following chemical elements is not a major requirement for most cells?
Hydrogen
Carbon
Nitrogen
Iodine
Which of the following statements is true of passive transport?
It requires a gradient
It requires energy
It includes endocytosis
It only moves water
Which of the following statements is true of active transport?
It does not require energy
It requires a concentration gradient
‘Phagocytosis’ is a process which involves the engulfment of whole cells or particles
‘Group translocation’ involves the formation of vesicles of liquid which are taken into the cell.
A cell exposed to a hypertonic environment will ___________due to osmosis.
Gain water
Lose water
Neither gain nor lose water
Burst
As far as temperature requirements, most human and animal pathogens are:
Thermophiles
Mesophiles
Psychrophiles
Extreme thermophiles
Most bacteria grow best in a pH range of:
6.2 – 6.8
8.0 – 8.5
4.5 – 5.0
7.0 – 7.2
Bacteria reproduce by a simple asexual means of reproduction called _______________.
Outline the steps of this process.
In the phases of bacterial growth in culture, which phase is the period of rapid cell division in which the cells are most vulnerable to the effects of antibiotics and radiation?
Log phase
Lag phase
Death phase
Stationary phase
A ‘generation time’ is:
The time it takes for a bacterial cell population to die off
The time it takes for antibiotics to inhibit bacterial growth
The time it takes for 1 bacterial cell to divide into 2 cells
The time it takes for the bacterial population to reach 1 million cells
In a viable plate count, each __________________represents a _________________in the original sample being tested.
Living bacterial cell, colony
Colony, living bacterial cell
Hour, generation
Colony, living or dead bacterial cell