BIO 113 METZLER EXAM 3 EXAM QUESTIONS

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BIO 113 METZLER EXAM 3 EXAM QUESTIONS

Actual Qs and Ans - Expert-Verified Explanation -Guaranteed passing score -64 Questions and Answers

-Format: Multiple-choice / Flashcard

Question 1: Photo-

Answer:

use light as source of energy

Question 2: Biofilm channels

Answer:

Allow nutrients

Question 3: Hyperthermophiles

Answer:

Organisms that grow in extremely high temperatures (70-105 degrees C)

Question 4: Fragmentation

Answer:

A means of asexual reproduction whereby a single parent breaks into parts that regenerate into whole new individuals.

Question 5: Heterotroph

Answer:

an organism deriving its nutritional requirements from complex organic substances.

Question 6: Hydrogen

Answer:

needed for electrons.

Question 7: Thioglycollate broth

Answer:

used to test an organism's oxygen sensitivity

Question 8: Carbon

Answer:

needed for metabolism.

Question 9: viable plate count

Answer:

estimation of the size of a microbial population based upon the number of colonies formed when diluted samples are plated onto agar media. More precise, direct method

Question 10: Conidiospores

Answer:

Spore produced by sac and club fungi during asexual reproduction. Filamentous bacteria (looks like strains of hair). EX. mold

Question 11: anaerobic jar

Answer:

Many anaerobes require small amounts of CO2 for cell growth

• Water added to chemicals in bag to generate H2 and CO2.

• Oxygen removed from chamber by combining w/H to form water (palladium pellets)

• Methylene blue indicator turns colorless when O2 all used up.

Used to create anaerobic environment.

Question 12: Photoheterotrophs

Answer:

An organism that obtains energy from sunlight and carbon from organic sources.

Question 13: Psychrophiles

Answer:

cold-loving microbes -10-20 degrees C

Question 14: aerotolerant anaerobes

Answer:

can tolerate oxygen and grow in its presence even though they cannot use it

Question 15: Growth factor

Answer:

one of a group of external regulatory proteins that stimulate the growth and division of cells

Question 16: environmental influences on microbial growth

Answer:

Oxygen Nitrogen Temperature Ph Osmotic pressure Hydrostatic pressure

Question 17: Thermus acquaticus

Answer:

Hot spring bacteria, thermophile

Question 18: Growth factor

Answer:

Most microorganisms also require small amounts of certain organic chemicals that they cannot synthesize.

Question 19: Chemo-

Answer:

acquire energy from redox reactions involving organic and inorganic chemicals

Question 20: binary fission process

Answer:

• As the chromosome is duplicating, the copies move towards the opposite ends of the cell.

• The cell elongates

3.cell elongates the plasma membrane grows inward and more cell wall is made, dividing the parent cell into two daughter cells

Question 21: aerobes

Answer:

need oxygen to survive. No fermentation

Question 22: Logrithmic growth

Answer:

increase in size of a microbial population in which the number of cells doubles in a fixed interval.

Question 23: facultative halophiles

Answer:

those that do not require, but can tolerate high salt concentrations, tolerate high osmotic pressure

Question 24: best PH for preservatives. EX. pickles, sauerkraut, cheeses.

Answer:

• and under

Question 25: log phase

Answer:

The period of exponential growth of bacterial population. Rapid change. Antibiotics most effective.

Question 26: Proteus species

Answer:

Normal microbiota of the intestinal tract. Cause urinary tract infections. Basic ph

Question 27: sulfur

Answer:

critical to vitamin structure and proteins