Speedback Assignment 2

A medium that contains yeast extract, glucose, and peptones would be a(n)

A bacterial suspension produces a turbidity reading that corresponds to 5 x 107 CFU/ml. A viable plate count of the same suspension produces a concentration of only 1 x 105 CFU/ml. You most correctly conclude that

In metabolism, ______ reactions liberate energy used to make ATP, whereas ______ reactions require energy supplied by the hydrolysis of ATP.

The ATP made by oxidative phosphorylation

Why are both the temperatures and times involved in hot air sterilization higher than those involved in steam sterilization?

At which phase of microbial growth is the growth rate identical to the death rate?

A bacterial growth experiment began with 100 cells and ended with 409,600 cells. How many generations occurred?

During Glycolysis

Suppose you have a suspension of C. botulinum endospores that has a decimal reduction time (DRT) of 1.5 minutes at 121 °C. If you had 1 x 10 6 endospores, how long (at 121 °C ) would it take to reduce this number to a single organism?

The process of destroying vegetative pathogens on living tissue is most correctly called

What type of organism would have an optimum growth temperature at about 12 °C?

Plasmas, supercritical fluids, and peroxygens are all

The most important products of the Krebs cycle are

The method of preserving bacterial cultures that involves sublimation is

The germicidal action of chlorine is due to the formation of

The net yield of ATP equivalents from one turn of the Krebs cycle (starting with acetyl-CoA) is

The most common physical method of microbial control in foods is

The most resistant microbe (of the ones listed) to chemical biocides is

A bacterostatic agent

Flavoproteins, cytochromes, and ubiquinones are all part of

Phenolics, biguanides, halogens, alcohols, and probably quaternary ammonium compounds (Quats) all cause damage to the cell’s

Radiation does most of its lethal damage by causing breaks in, or changes to the microbe’s

Which of the following is not a common end product of a microbial fermentation?

Organisms that grow deep in the bottom of the ocean (no light) next to hydrogen sulfide vents (source of energy), and are able to fix CO2 in the seawater, would be referred to as

Which type of organism is indifferent to either the presence or absence of oxygen?

During photosynthesis, the main products of the light-dependent reactions are ________, whereas the main products of light-independent reactions are __________.

Enzymes

Five bacterial cells with a generation time of 15 minutes were allowed to grow for 8 hours. How many cells are present?

A sample of milk is diluted 1:2,000,000 and 1 ml samples of this dilution are plated in duplicate. The average plate count is 50 CFU. How many CFU/ml are present in the undiluted milk?

Blood agar containing an antibiotic that inhibits gram-positive organisms, would most correctly be called