question

Which of the following statements about photophosphorylation is false?

answer

It requires CO2

question

A strictly fermentative bacterium produces energy

answer

By glycosis only

question

Which of the following statements about beta oxidation is false?

answer

B) It involves the formation of 2-carbon units.

question

In noncyclic photophosphorylation, O2 is produced from

answer

H2O

question

Which of the following uses CO2 for carbon and H2 for energy?

answer

Chemoautotroph

question

Cyanobacteria are a type of

answer

Photoautotroph

question

Beggiatoa bacteria get energy by oxidizing S2- to S6+. This means they take ___ for their ___.

answer

electrons; electron transport chain

question

The term facilitative anaerobe refers to an organism

answer

uses oxygen or grows w/o oxygen

question

Which of the following is an advantage of the standard plate count?

answer

Determines the number of viable cells

question

Thirty-six colonies grew in nutrient agar from 1.0 ml of undiluted sample in a standard plate count. How many cells were in the original sample?

answer

36

question

Most bacteria grow best at pH:

answer

7

question

A culture medium consisting of agar, human blood, and beef heart is a:

answer

Complex medium.

question

Which of the following statements define generation time the best?

answer

The length of time needed for a cell to divide

question

Which group of microorganisms is most likely to spoil a freshwater trout preserved with salt?

answer

Facultative halophiles

question

Patients with indwelling catheters are susceptible to infections because:

answer

Biofilms develop on catheters.

question

Which of the following is the best method to sterilize heat-labile solutions?

answer

A) Membrane filtration

question

Which of the following best describes the pattern of microbial death?

answer

B) The cells in a population die at a constant rate.

question

Which of the following substances can sterilize?

answer

Ethylene Oxide

question

Iodophors differ from iodine (I2) in that iodophors:

answer

A) Don't stain.
B) Are less irritating.
C) Are longer lasting.
D) Are combined with a nonionic detergent.
E) All of the above. <-----

question

Which of the following affects the elimination of bacteria from an object?

answer

A) Number of bacteria present
B) Temperature
C) pH
D) Presence of organic matter
E) All of the above <----

question

Which of the following could be used to sterilize plastic Petri plates in a plastic wrapper?

answer

A) Gamma radiation

question

A disk-diffusion test using Staphylococcus gave the following results:
Table 1.

Which compound was the most effective against Staphylococcus?

answer

C) C

question

In Table 1, which compound was the most effective against E. coli?

answer

E) Can't tell

question

Which of the following will NOT destroy prions?

answer

D) Boiling

question

If you were preparing nutrient agar at home and didnt have an autoclave, what could you use to sterilize the nutrient agar?

answer

A) Pressure cooker at 121°C for 15 minutes

question

DNA is made of:

answer

C) Two strands of nucleotides running antiparallel.

question

Which of the following is NOT a product of transcription?

answer

A) A new strand of DNA

question

An enzyme produced in response to the presence of a substrate is called:

answer

B) An inducible enzyme.

question

According to the operon model, for the synthesis of an inducible enzyme to occur, the

answer

C) Substrate must bind to the repressor.

question

Synthesis of a repressible enzyme is stopped by:

answer

E) The corepressor-repressor binding to the operator.

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In transcription,

answer

C) DNA is copied to RNA.

question

Table 2

If the sequence of amino acids encoded by a strand of DNA is serine-alanine-lysine-leucine, what is the order of bases in the template strand of DNAUse Table 2 for reference

answer

B) 3?- AGACGTTTCAAT

question

(Use Table 2) The anticodon for valine is:

answer

E) CAA

question

(Use Table 2) What is the sequence of amino acids encoded by the following sequence of bases in a strand of DNA
3 ATTACGCTTTGC

answer

D) Transcription would stop at the first codon

question

Figure 4

In Figure 4, which model of the lac operon correctly shows RNA polymerase, lactose, and repressor protein when the structural genes are being transcribed?

answer

D) d

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