Blog

Bacterial DNA was isolated and it was determined that 15% of the DNA is composed of cytosine. What percentage of the DNA is adenine?

Which peptide would migrate the slowest in a SDS-PAGE gel? Peptide Molecular Weight (g/mol) A 360 B 1080 C 1800 D 1440 ​

A researcher is attempting to amplify a specific DNA fragment using PCR but notices that no product is formed after 35 cycles. Upon review, they realize that the primers bind correctly, but the DNA polymerase loses activity after the first heating step. Which change would most directly resolve this problem?

If the isoelectric point (pI) for an amino acid is at point A on the following curve, what is the charge on the amino acid at point B?

The lateral mobility of lipids within a membrane depends on temperature as well as other factors. What would be expected to happen to the lateral mobility if the temperature were decreased?

A polypeptide was digested by trypsin and chymotrypsin. Use the following information to determine the polypeptide sequence. Remember that trypsin cleaves next to Lys and Arg, and chymotrypsin cleaves next to Trp, Phe, Leu, and Tyr. Trypsin Digest Chymotrypsin Digest LMYK CE MGFCE LMYKW WDER DERMGF ​

A 25.0 mL sample of hydrochloric acid is titrated with 0.150 M potassium hydroxide. If 22.0 mL of base is required to neutralize the acid, what is the molarity of the acid?

What is the pH of a solution with [H⁺] = 7.5 × 10⁻⁹ M?

In a neutralization reaction, the products are always a salt and water.

A conjugate acid differs from its base by one proton (H⁺).