What is the origin of H5N1 virus?
A. Birds
B. Dogs
C. Pigs
D. Humans
E. Cats
Answer: A
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A model organism called Caenorhabditis elegans (a soil nematode) has been used to study cell signaling during development because of its simplicity. For example, a structure such as the vulva arises from only three cells, which are called ____ cells
Fill in the blank with the appropriate word.
Which substance is reabsorbed in the descending limb of the loop of Henle?
a. salts b. water c. glucose d. H+ e. urea
Geographic biodiversity "hot spots"
A. have the highest vascular plant species richness and ?3 unique ecosystems. B. have ?1500 endemic plant species and have lost ?70% of the original habitat. C. have the greatest number of species that have lost >50% of their original range. D. contain ?1500 vascular plant species and have lost >50% of their original range.
Which is true concerning cell division?
A. During meiosis I, sister chromatids pair up and then are separated B. An asexually reproducing organism needs mitosis to produce a genetically diverse set of daughter cells in order to maintain genetic diversity C. When comparing the parent and daughter cells, meiosis differs in both the ploidy level and ploidy number, whereas mitosis differs in neither D. During crossing over, an allele for brown eyes may be switched with an allele for brown hair