I M a. cells in the nail plate undergo mitosis b. cells in the nail matrix under
ID: 209563 • Letter: I
Question
I M a. cells in the nail plate undergo mitosis b. cells in the nail matrix undergo mitosis c. cells in the eponychium undergo mitosis d. cells in the medial and lateral nail folds undergo mitosis. 7. Nail growth occurs when: 8·The "soft spots" in an infant's skull are known as: a. fontanels b. sutures. c. metopic joints. d. hyaline cartilage. 9. The type of skin tumor that involves the keratinocytes of the stratum spinosum is a. basal cell carcinoma. b. squamous cell carcinoma. c. malignant keratocytoma. d. malignant melanoma. 10. Sebaceous glands secrete by secretion; sweat glands secrete by secretion. a. merocrine, holocrine b. sweat, holocrine c. milk, merocrine d. holocrine, merocrine 11. What is the vitamin synthesized by the skin? a. D 12. Which of the following provides an orange-yellow pigmentation for the skin? a. Keratin b. Melanin c. Elastin d. Carotene 13. Which of the following proteins is found in skin, hair, fingernails and toenails? a. Keratin b. Melanin c. Elastin d. Carotene 14. Which of the following is the pigment that darkens the skin'? a. Keratin b. Melanin c. Elastin d. Carotene 15. Which of the following cells in the epidermis is associated with a sensory nerve endin touch? a. Merkel's cells b. Basal cells c. Langerhan's cells d. MelanocytesExplanation / Answer
Q-11
Answer-:A) D
Vitamin D serves as hormone precursor, Vitamin D3(also called cholecalciferol) is formed non- enzymatically in skin from 7-dehydrocholestrol in the presence of a UV component of Sunlight,Dietary forms of Vitamin D are absorbed through the aid of bile salts in the small intestine, Whether absorbed in the intestine (or) Photosynthesized in the skin,
Q-13
Answer-:(A) Keratin
*Keratin are fibrous protein present in eukaryotes, They form a large family with about 30 members being distinguished, Keratin have been classified as either alpha-keratin & Beta-Keratin,
Alpha keratin are intermediate filament protein present only in many metazoans, including Vertebrate,
Alpha keratin constitute almost the entire dry weight of hair,wool,nails,scales,hooves and much of the outer layer of Skin,
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