The modern-day group of vertebrates that bridges the evolutionary gap between la

Question

The modern-day group of vertebrates that bridges the evolutionary gap between land-dwe and water-dwelling organisms is: A) reptiles. B) whales and dolphins. C) amphibians. D) aquatic birds. F.) fish. RNA molecules that function as enzymes: A) form primitive cells. B) degrade proteins. C))are called ribozymes. D) developed from protein-based enzymes. E) duplicate lipid molecules. What is the relationship among DNA, a gene, and a chromosome? A) A chromosome contains hundreds of genes, which are composed of DNA. B) A chromosome contains hundreds of genes, which are composed of protein. C) A gene contains hundreds of chromosomes, which are composed of protein. D) A gene contains hundreds of chromosomes, which are composed of DNA. E) A gene is composed of DNA, but it has no relationship to a chromosome. How many bases are in a codon? A) 64 B) 3 C) 20 D) 4 Mutations are important because they: A) usually provide an individual with increased reproductive rates. B) provide variation that can result in evolutionary change. C) are always beneficial in the individuals affected by them. D) occur in response to environmental demands. Each of your body cells: A) is genetically identical to all others. B) changes genetically as you grow and develop. C) contains unique genetic information. D) contains only the genetic information needed for that type of cell. The genetic code is: A) used during the translation of DNA to mRNA. B) read in sets of three bases called codons. C) different in different organisms. If, in a heterozygous individual, only one allele is expressed phenotype, that allele is: A) recessive. B) normal. C) potent. (D) dominant. E) haploid. Probably the greatest advantage for the original multicellular organisms was their ability to: A) use more oxygen. B) photosynthesize. C) increase their metabolism. D) increase their food intake. E) avoid predators.

Explanation / Answer

39(C)

40(C)

41(A)

42(B)

43(B)

44(A)

45(B)

46(D)

47(E)

All the answers are correct except 45 and the answer of 44 is( a) because it is genetically identical to all others.

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