Which of the following statements about adhesion molecules is false?
A. Cadherins and pectins are both
transmembrane proteins.
B. Cadherins and integrins provide the
molecular mechanisms for adhesion in
animals, but not plants.
C. Cadherins adhere adjacent epithelial cells
to one another.
D. Integrins bind epithelial cells to the
extracellular matrix.
E. Pectins are found in plant tissues, but not
animal tissues.
A
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Most of the Earth’s phosphorous is in the form of ____
a. phosphoric acid b. elemental phosphorous c. phosphate d. phosphorous cations e. carbonate
If two continents converge and are united, then the collision should cause
A. a net loss of intertidal zone and coastal habitat. B. the extinction of any species adapted to intertidal and coastal habitats. C. a decrease in climatic extremes in the interior of the new supercontinent. D. an overall decrease in the surface area located in the continental interior.
Which of the following is the correct sequence of PCR?
A) Heat to 90°C (to separate DNA), then cool to 50°C (to bind primers and enzymes), and then reheat to 70°C (to synthesize DNA). B) Heat to 90°C (to bind primers and enzymes), then cool to 50°C (to separate DNA), and then reheat to 70°C (to synthesize DNA). C) Heat to 70°C (to bind primers and enzymes), then cool to 50°C (to synthesize DNA), and then reheat to 90°C (to separate DNA). D) Heat to 70°C (to separate DNA), then cool to 50°C (to bind primers and enzymes), and then reheat to 90°C (to synthesize DNA).
In radishes, long or round are homozygous forms of an incompletely dominant gene, and oval is the phenotype of the heterozygote. If a long radish is crossed with a round radish, which of the following phenotypic ratios of the F2 generation is correct?
A. all round B. all oval C. 1/2 long, 1/2 oval D. 1 long, 2 oval, 1 round E. 1/2 oval, 1/2 round