Facilitated diffusion is limited by
A. the number of carrier proteins in the membrane.
B. the size of the cell.
C. size of the pores in the membrane.
D. ATP concentration.
E. osmotic pressure.
Answer: A
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A gene may have many alleles, but a person has only two alleles for a gene, because
A) having more than two alleles is always lethal. B) a gene can be altered in many ways, but a person has only two copies of any gene. C) a genotype is haploid because of meiosis. D) having more than two alleles unbalances the chromosomes.
How does an enzyme lower the energy of activation needed for a chemical reaction?
What will be an ideal response?
Which prokaryotic nutritional groups uses CO2 and sunlight to produce energy?
a. photoautotrophs b. chemoautotrophs c. photoheterotrophs d. chemoheterotrophs e. methanoheterotrophs
The world's first genetically engineered pharmaceutical product was ________
A) humulin B) HGH C) tPA D) EPO