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Welcome Drs 👨⚕️
🔘I'm Moayyad Hussein 🇸🇩🇸🇦
Holds a "MBBS" & “USMLE Step1” ..
I will put here Mcqs for medical students and then i will answer it with the explanation .. 📋
🔴For any questions or suggestions this is my account on Telegram :
@Auod5
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The latest Messages 7
2021-06-19 14:21:51
Answer : Viral surface antigen (HBsAg) ..
The envelope of hepatitis B virus contains an antigen known as HBsAg (
hepatitis B surface antigen). This antigen is of importance because production of antibodies to HBsAg indicates immunity against hepatitis B virus,
which resulted either from infection or vaccination with HBsAg.
568 views11:21
2021-06-19 14:17:26
Answer : Anti-centromere ..
The woman's disease described includes Esophageal dysmotility, Telangiectasias, and Raynaud's phenomenon of
CREST syndrome, or limited scleroderma. The other features are calcinosis and sclerodactyly.
Anti-centromere antibodies are associated with CREST.The second part of the question describes drug-induced lupus from isoniazid. Classic drug causes include hydralazine, procainamide > phenytoin and amiodarone. Anti-histone antibodies are associated.
Anti-scl 70 antibody is associated with diffuse scleroderma, which does not exhibit CREST syndrome.
518 views11:17
2021-06-19 12:34:11
Answer : Mitochondria “power house” ..
Prokaryotic cells are less structured than eukaryotic cells. They
have no nucleus; instead their genetic material is free-floating within the cell. They also lack the many membrane-bound organelles found in eukaryotic cells. Thus, prokaryotes
have no mitochondria. ATP synthase In bacteria it is located in the
cell membrane with the bulky hydrophilic catalytic F1 portion sticking into cytoplasm.
430 viewsedited 09:34
2021-06-12 22:31:39
Answer : Its derived from L4-S3 segments of the brachial plexus ..
The correct is derived from L4-S3 segments of the
sacral plexus ..
550 views19:31
2021-06-12 22:24:34
Answer : A and D .. See this image
529 views19:24
2021-06-12 22:24:27
Answer : A and D ..
See this image
503 views19:24
2021-06-12 22:19:55
Answer : Natural killer cells (NK cells) ..
NK cells : are lymphocytes in the same family as T and B cells, coming from a common progenitor. However, as cells of the innate immune system, NK cells are classified as group I Innate Lymphocytes (ILCs) and respond quickly to a wide variety of pathological challenges. NK cells are best known for killing virally infected cells, and detecting and controlling early signs of cancer. As well as protecting against disease, specialized NK cells are also found in the placenta and may play an important role in pregnancy.
506 viewsedited 19:19
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