Day: August 25, 2023

#Physiology MCQ Modules

Physiology model No. 1

By Dr. Ahmed Hafez

1) all of the following statements are true for the myosin head except : a-it has an actin binding site b-it has ATP binding site c-it has ATPase activity d- it has a Ca+2 binding site   2) end-plate potential : graded   3) Extracelluar fluid can be measured by: a-Radio active iodine b-Even’s blue dye c-inulin d-deuterium oxida(heavy water) e- creatinine   4) facilitated diffusion: a-does not need carrier protein b-passive transport   5)Na+_K+ pump: a-coupled with ATP b-downhill its electrochemical gradient c- pump 3 K   6) A normal individual with total body water of 42 L have

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#Biochemistry MCQ Modules

Biochemistry module No. 1

By Dr. Ahmed Hafez

The peptide bond: has a partial double bond character is charged but non polar has cis conformation can be easily destroyed by acids keeps the integrity of proteins by hydrophobic interaction   Regarding elastin: it is a tough protein with high tensile strength it is rich in proline and lysine it is soluble protein polymer cannot regain its original length when stretched mutation of tropoelastin gene leads to marfans syndrome   Which is incorrect about proline: it contains imino group it has uncharged polar group important for fibrous structure of collagen doesn’t participate in hydrogen bonds its side chain has

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#Histology, Cytology & Embryology MCQ Modules

Embryology model No. 2

By Dr. Ahmed Hafez

1) regarding corpus luteum which is incorrect : a- it developed under the effect of LH b- it secretes progesterone c- when pregnancy occurs degeneration of corpus luteum is preventedby hCG d- if oocyte is not fertilized the corpus luteum degenerate 10-12 days after ovulation e- corpus luteum of pregnancy remain active throughout the gastation period   2) which of the following component plays the most active role in invading the endometrium during implantation: a- epiblast b- syncytiotrophoblast c- hypoblast d- extraembryonic somatic mesoderm e- extraembryonic splanchnic mesoderm   3) proliferative phase is influenced by the following hormones: a- estrogen

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#Histology, Cytology & Embryology MCQ Modules

Embryology MCQ model No. 1

By Dr. Ahmed Hafez

1. This phase in the development of sperm has no counterpart in ovum-development (a) spermiogenesis (b) phase of multiplication (c) phase of growth (d) polar body formation Answer: (a)   2. During this phase, the nuclear envelope begins to disappear (a) cytokinesis (b) S phase (c) Anaphase (d) Prometaphase Answer: (d)   3. In humans, the number of ova and sperms that would be produced from 100 secondary oocytes and 100 secondary spermatocytes during gametogenesis is (a) 50 ova, 100 sperms (b) 100 ova, 100 sperms (c) 100 ova, 200 sperms (d) 200 ova, 200 sperms Answer: (c)   4.

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#Anatomy MCQ Modules

Anatomy MCQ Module No. 4

By Dr. Ahmed Hafez

1) Which of the following terms describes the body’s ability to maintain its normal state? (A) Anabolism(B) Catabolism(C) Tolerance(D) Homeostasis(E) Metabolism 2) Which of the following best describes the human body’s defense mechanism against environmental bacteria? (A) Hair in the nose(B) Mucous membranes(C) Osteoblasts(D) Saliva(E) Tears 3) Which cells in the blood do not have a nucleus? (A) Lymphocyte(B) Monocyte(C) Erythrocyte(D) Basophil(E) Neutrophil 4) Which of the following is flexible connective tissue that is attached to bones at the joints? (A) Adipose(B) Cartilage(C) Epithelial(D) Muscle(E) Nerve 5) Which of the following allows air to pass into the lungs? (A) Aorta(B)

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#Anatomy MCQ Modules

Anatomy MCQ module No. 3

By Dr. Ahmed Hafez

1. Which of the following muscular valve controls the flow of digestive juice from the hepatopancreatic duct to the duodenum? (a) Sphincter of Oddi (b) Semilunar valve (c) Ileocaecal valve (d) Pyloric sphincter Sol: (a) Sphincter of Oddi.   2. Which of the following is present on the surface of intestinal epithelial cells? (a) Zymogen granules (b) Pinocytic vesicles (c) Phagocytic vesicles (d) Microvilli Sol: (d) Microvilli.   3. Lungs are enclosed within (a) Perichondrium (b) Periosteum (c) Pleural membrane (d) Pericardium Sol: (c) Pleural membrane.   4. The maximum amount of urea is present in  (a) Dorsal Aorta (b) Hepatic Vein (c)

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