Experiments like those first performed by Miller and Urey demonstrated that
a. amino acids and other organic compounds could form in conditions that mimicked the earth's early atmosphere.
b. a lipid-protein film will eventually be formed by thermal convection.
c. DNA forms readily and reproduces itself.
d. complete, functioning prokaryotic cells are formed after approximately three months.
e. meteorites contained organic compounds.
a
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How does gene flow affect the genetic composition in populations?
A. Gene flow promotes genetic diversity by introducing new alleles into populations. B. Gene flow tends to make the allele frequencies in neighboring populations more similar to each other. C. Gene flow promotes genetic diversity by introducing new alleles into populations and gene flow tends to make the allele frequencies in neighboring populations more similar to each other. D. Gene flow promotes genetic similarities by removing alleles from a population.
Which of the following is found in every nucleotide?
a. ribose b. a single phosphate group c. a single carbon ring d. a double nitrogen ring e. nitrogen
Crossing over between the A and B genes in a parental cell containing an AB chromosome and an ab chromosome yields which of the following ratios of parental:recombinant gametes?
A) 100:0 B) 75:25 C) 50:50 D) 25:75 E) The ratio depends on whether the parental cell is male or female.
Identify four of the features that terrestrial vertebrates had to evolve in order to adapt to a terrestrial environment?
What will be an ideal response?