52) _______Which of the following molecules are involved in cell-matrix and/or c

Question

52) _______Which of the following molecules are involved in cell-matrix and/or cell-cell interactions and span the plasma membrane of the cell? (1) elastin, (2) CAMs, (3) collagen, (4) sonic hedgehog, or (5) syndecans

a) 1, 2, 3, and 5

b) 1, 3 and 4

c) 2 and 5

d) 4

e) 1, 3 4 and 5

53) _______Which of the following characteristics are NOT the same for limb buds and blastemas? (1) they have a specialized apical epithelium required for distal outgrowth, (2) they develop from lateral plate mesoderm, (3) they arise from an embryonic limb field, or (4) they can be induced to form supernumerary limb structures a) 1, 2 and 4 b) 3 and 4 c) 2 and 3 d) 2, 3 and 4 e) 1 and 2

54) _______Which of the following are generally associated with decreased levels of gene expression? (1) euchromatin, (2) DNA methylation, (3) histone acetylation, (4) imprinting or (5) miRNA a) 1 and 3 b) 1, 3 and 5 c) 2, 3 and 4 d) 2 and 4 e) 2, 4 and 5

Explanation / Answer

52) a) 1,2,3 and 5 - elastin, CAMs, collagens and syndecans are involved in cell matrix and/or cell-cell interactions and span the plasma membrane of the cell.

53) c) 2 and 3 - lateral plate mesoderm is the precursor of limb bud development while not of blastema.

54) d) 2 and 4 - DNA methylation and imprinting leads to gene silencing which comes under decreased level of gene expression.

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