The sodium-potassium pump is used in
a. facilitated diffusion.
b. simple diffusion.
c. active transport.
d. osmosis.
e. bulk flow
C
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In a growing population, the youngest age classes have
A. the highest number of deaths/year. B. the fewest individuals. C. the most individuals. D. the smallest number of deaths/year. E. the most individuals and the largest number of deaths/year.
For diffusion to occur ____ is necessary.
A. a concentration gradient B. a differentially permeable membrane C. temperature above 0°C D. a carrier molecule
DNA ligase binds
A) recombinant DNA to transformed bacterial cells. B) recombinant DNA to recombinant proteins. C) nucleotides in the DNA backbone together. D) nucleotide base pairs from opposite strands together.
The measured distance between genes D and E in a two-point testcross is 50 map units. Where are genes D and E in relation to each other? (Select all that apply.)
A) D and E are on different homologous chromosomes. B) D and E are on the same chromosome, at least 50 map units apart. C) D and E are on the same chromosome, exactly 50 map units apart. D) D and E are on the same chromosome, less than 50 map units apart.