A protein found in Salmonella bacteria can exist as either a dimer that binds DNA and represses transcription of the gene encoding the protein or as a monomer that does not bind DNA. At lower temperatures (28 °C), the bacteria expressed the protein at lower levels than at higher temperatures (37 °C). These findings are most likely evidence of:A.disruption of primary but not tertiary structure at 37 °C.B.disruption of quaternary but not primary structure at 37 °C.C.alteration of both secondary structure and quaternary structure at 37 °C.D.alteration of neither secondary nor tertiary structure of at 37 °C.Submit
Question
A protein found in Salmonella bacteria can exist as either a dimer that binds DNA and represses transcription of the gene encoding the protein or as a monomer that does not bind DNA. At lower temperatures (28 °C), the bacteria expressed the protein at lower levels than at higher temperatures (37 °C). These findings are most likely evidence of:A.disruption of primary but not tertiary structure at 37 °C.B.disruption of quaternary but not primary structure at 37 °C.C.alteration of both secondary structure and quaternary structure at 37 °C.D.alteration of neither secondary nor tertiary structure of at 37 °C.Submit
Solution
The question describes a protein that can exist in two forms: a dimer that binds DNA and represses transcription, and a monomer that does not bind DNA. The protein is expressed at lower levels at lower temperatures (28 °C) than at higher temperatures (37 °C).
This suggests that the protein's structure is affected by temperature, causing it to change from a dimer to a monomer. This change in structure from a dimer (two units) to a monomer (one unit) is a change in quaternary structure, which is the structure of a protein resulting from the assembly of multiple polypeptide chains.
The question does not provide any information suggesting that the primary structure (the sequence of amino acids) is affected by the temperature change. Therefore, the most likely answer is B. disruption of quaternary but not primary structure at 37 °C.
Similar Questions
Which characteristics can differentiate Salmonella from Shigella? (Check all that apply.)Check All That ApplyLactose fermentationLactose fermentationH2S productionH2S productionMotilityMotilityUrease productionUrease productionIndole production
Salmonella, a rod-shaped bacteria that causes food poisoning and other diseases, is commonly found in:AYogurt and cheeseBRaw meat and eggsCRotten vegetablesDWhole wheat products
(a) Salmonella is pathogenic bacterium(b) Sustained high fever (39°C to 40°C)(c) Intestinal perforation in severe cases(d) Confirmed by "widal test" (e) "Marry Mallon" was a carrierAbove statements are true for :-A Plague B Diphtheria C Typhoid D Dysentery
Animal- microbe interaction Salmonella
Salmonella, a rod-shaped bacteria that causes food poisoning and other diseases, is commonly found in:ARotten vegetablesBRaw meat and eggsCWhole wheat productsDYogurt and cheese
Upgrade your grade with Knowee
Get personalized homework help. Review tough concepts in more detail, or go deeper into your topic by exploring other relevant questions.