Practice Questions

TLS Online TPP Program

#Question id: 370

Which of the following statements is true about buffer solutions?

#XL - S Microbiology

They maintain a constant pH of 7.
They maintain a constant pH when acids are added to them but not when bases are added to them.
They fluctuate in pH when either acids or bases are added to them.
They maintain a relatively constant pH when either acids or bases are added to them.

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TLS Online TPP Program

#Question id: 3753

#XL - Q Biochemistry

Cytosine makes up 42% of the nucleotides in a sample of DNA from an organism. Approximately what percentage of the nucleotides in this sample will be thymine?

TLS Online TPP Program

#Question id: 3755

#XL - Q Biochemistry

In E. coli, there is a mutation in a gene called dnaB that alters the helicase that normally acts at the origin of replication. Which of the following events would you expect to occur as a result of this mutation?

TLS Online TPP Program

#Question id: 3756

#XL - Q Biochemistry

In E. coli, which enzyme catalyzes the elongation of a new DNA strand in the 5' → 3' direction?

TLS Online TPP Program

#Question id: 3757

#XL - Q Biochemistry

Which of the following characteristics of eukaryotic telomeres cause them to replicate differently than the rest of the chromosome?

TLS Online TPP Program

#Question id: 3759

#XL - Q Biochemistry

In E. coli, to repair a thymine dimer by nucleotide excision repair, in which order do the necessary enzymes act?