Practice Questions

TLS Online TPP Program

#Question id: 34549

Select all features that correctly describe the bacterial cytoplasmic membrane:

#XL - S Microbiology

It contains integral and peripheral membrane proteins.
It is impermeable to most water-soluble molecules without transport proteins.
It contains porins as major transport proteins.
It is involved in active transport and signal transduction.

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TLS Online TPP Program

#Question id: 5755

#XL - S Microbiology

A researcher studying bacterial toxin predicts that a lysine within the toxin is important for binding it’s target cell. She used site-directed mutagenesis to change a codon for lysine (AAA) to one for asparagine (AAU). However, the mutant toxin still binds to its target cell just as well as the wild-type toxin bound and appears to have no other changes. This type of mutation is probably

TLS Online TPP Program

#Question id: 5756

#XL - S Microbiology

Type of mutation caused by an addition or deletion of a base in a polypeptide-encoding part of a gene

TLS Online TPP Program

#Question id: 5757

#XL - S Microbiology

A new E. coli mutant was tested for auxotrophy. The mutant grows on:

minimal medium (M) + arginine (A) + proline (P)

M + P + histidine (H)

M + A + H + P

but not on M or on M + A + H. The mutant requires