Biodiversity hotspots are defined by which two criteria?
a) species richness and size
b) number of endemic species and degree of threat
c) ecological diversity and species diversity
d) size of distance from nearest alternative hotspot
e) species richness and ecosystem integrity
Answer: b) number of endemic species and degree of threat
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In vascular plants, xylem and phloem are only present in the sporophyte generation
A. true B. false
Bacterial cells that cannot readily pick up DNA molecules from their surroundings can be induced to do so by ____
a. artificial transformation
b. double crossing over c. crossing over d. constriction e. infection
Which of the following would provide the longest lasting treatment for Leber's congenital amaurosis II?
A) Replacing an enzyme that restores the function of T and B cells B) Substrate reduction therapy and pharmacological chaperone therapy C) Injecting adeno-associated virus carrying ornithine transcarbamylase (OTC) into T and B cells D) Injecting adeno-associated virus carrying a wild type version of the RPE65 gene into affected cells of the retina
The bud stage of tooth development describes which of the following events?
A. Dentin secretion begins. B. Odontoblasts differentiate from jaw mesenchyme. C. Oral ectoderm invaginates into the mesenchyme of the jaw. D. Permanent teeth begin to extrude the deciduous teeth. E. The enamel knot disappears.