Western Blot detects?
Western Blot is a technique used in molecular biology. So, the question is asking what it detects. Let me recall: Western Blot is used to detect specific proteins in a sample. The process involves separating proteins by gel electrophoresis, transferring them to a membrane, and then using antibodies to detect the target protein. So the core concept here is protein detection using antibodies.
Now, the options might include things like DNA (which is Southern Blot), RNA (Northern Blot), proteins (Western Blot), or maybe something else like carbohydrates. Common distractors could be other blotting techniques or other molecules. The correct answer is B if the options are A: DNA, B: Protein, C: RNA, D: Carbohydrates. But since the user didn't provide the options, I have to assume based on standard questions.
The core concept is the purpose of Western Blot. The correct answer is protein detection. The wrong options would be other molecules like DNA, RNA, or maybe nucleic acids in general. Each of those is detected by different blotting methods. For example, Southern Blot for DNA, Northern for RNA. So explaining why those are wrong would involve mentioning the correct blotting technique for each molecule.
The clinical pearl here is remembering the blotting techniques: Southern for DNA, Northern for RNA, Western for proteins. A mnemonic could be S-N-W for DNA-RNA-Protein. Also, Western Blot is often used in diagnostic tests, like for HIV confirmation, which is a high-yield fact for exams.
Putting it all together, the answer should state that Western Blot detects proteins, using specific antibodies after gel electrophoresis. The incorrect options would be other molecules detected by different methods. The clinical pearl reinforces the blotting techniques and their applications.
**Core Concept**
Western Blot is a molecular biology technique used to detect **specific proteins** in a sample. It relies on **antibody-antigen interactions** after separating proteins via **gel electrophoresis** and transferring them to a membrane.
**Why the Correct Answer is Right**
Western Blot detects **proteins** by exploiting their molecular weight and antigenic specificity. Proteins are first separated by size using SDS-PAGE, transferred to a nitrocellulose membrane, and then probed with a primary antibody specific to the target protein. A secondary antibody conjugated to an enzyme (e.g., horseradish peroxidase) produces a detectable signal via chemiluminescence.
**Why Each Wrong Option is Incorrect**
**Option A:** DNA is detected via Southern Blot, not Western.
**Option C:** RNA is detected via Northern Blot.
**Option D:** Carbohydrates are not routinely analyzed using blotting techniques.
**Clinical Pearl / High-Yield Fact**
Remember the "blotting technique hierarchy": **Southern (DNA) → Northern (RNA) → Western (Protein)**. Western Blot is gold-standard for confirming HIV infection and diagnosing Creutzfeldt-Jakob disease via prion protein detection.
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