'Scalded Skin Syndrome' caused by Staphylococcus aureus is a TOXIN-mediated diseases
a. true
b. false
Ans: a. true
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Large amounts of epithelial cells, many of which are covered by tiny gram-variable rods and coccobacilli, and the absence of inflammatory cells in vaginal discharge are signs of:
a. pelvic inflammatory disease (PID). b. bartholinitis. c. cervicitis. d. bacterial vaginosis.
Mitochondrial DNA (mtDNA) is helpful in obtaining a DNA profile for very degraded genetic material because
A) cells have many mitochondria, and therefore several copies of mtDNA sequences. B) mitochondria contain oxidative enzymes that protect the DNA. C) mtDNA consists of a single helix, so it cannot be unwound. D) it uses uracil instead of thymine, which is a more stable nitrogenous base.
A leaf primordium is initiated as a small mound of tissue on the flank of a dome-shaped shoot apical meristem. The earliest physical evidence of the site of a newly forming leaf primordium would be
a. development of chloroplasts in a surface cell of the shoot apical meristem. b. cell division in the shoot apical meristem with the newly forming walls perpendicular to the surface of the meristem. c. preprophase bands parallel to the surface of the meristem in subsurface cells of the shoot apical meristem. d. elongation of epidermal cells perpendicular to the surface of the shoot apical meristem. e. formation of stomata in the epidermal layer of the shoot apical meristem.
DNA polymerase assembles new strands in a ____.
A. 5' to 3' direction only B. 5' to 3' direction building one strand and a 3' to 5' direction building the other stand C. 5' to 3' direction building the first half of a strand and a 3' to 5' direction building the second half of a strand D. 3' to 5' direction building the first half of a strand and a 5' to 3' direction building the second half of a strand E. 3' to 5' direction on the “old” 3' to 5' strand