At a given locus, homologous chromosomes have
A. the same genes but can have different alleles.
B. the same genes and alleles.
C. different genes and alleles.
D. different genes, but can have the same alleles.
A. the same genes but can have different alleles.
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Amphipathic organic molecules that serve as disinfectants by disrupting membranes and denaturing proteins are called
A. detergents. B. oxidants. C. sterilants. D. soaps.
What kind of analysis is needed to determine whether two mutations are in the same gene or in different genes?
What will be an ideal response?
Endothermy costs energy
a. true b. false
In 1979, a group at Cambridge discovered that in human mitochondria, UGA is not a stop codon but instead during translation results in the delivery of the amino acid tryptophan
It was extremely unexpected to discover that one organism could have two different genetic codes, and that the genetic code was not universal—it is mostly or nearly universal. The evolutionary history of the genetic code is an area of robust debate. Which of the following statements about the evolution of the genetic code is most likely true? A. There is no chemical correspondence between codons and amino acids—the code is arbitrary in its origin. B. The presence of genetic code alternatives directly challengesthe concept of a common ancestor for humansand E.coli. C. Life arose twice as independent events. D. The genetic code has a small number of alternative states but these differences cannot be used like nucleotide differences in the genome to infer phylogenies (relationships).