Which of the following do starch and cellulose have in common?
A) the type of glycosidic linkage used
B) the size of their monosaccharide subunits
C) the amount of hydrogen bonding that occurs between parallel strands
D) their main function in plants
Answer: B
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Migration, genetic drift, and mutation are like natural selection in that they:
A. result in evolution of a population. B. may alter the allele frequency in a population. C. may alter the genotype frequency in a population. D. are all methods of evolutionary change. E. All of the answer options are correct.
Why did the alleles that conferred insecticide resistance in mosquitoes become less frequent in the population when insecticide application was discontinued in the 1960s in Thailand?
A) The mosquitoes experienced a bottleneck and by chance the surviving insects had a low proportion of resistance alleles. B) The resistance alleles were linked to a body color variation that led to resistant mosquitoes experiencing a higher rate of predation. C) A mosquito population with a low proportion of resistant alleles migrated to Thailand and interbred with the original population. D) In the absence of pesticide, mosquitos homozygous for the resistance alleles had lower fitness than the other genotypes.
Which stage(s) produce(s) the characteristic
chills and fever of the disease? a. A b. B c. C d. A and B e. B and C
Which type of chemical bond forms between a cation and an anion?
a. nonpolar covalent bond b. polar covalent bond c. ionic bond d. hydrogen bond