Because they are made up of similar bones, the flippers of whales and the wings of birds are examples of...
a) vestigial organs
b) embryos
c) homologous structures
d) fossil structures
Ans: c) homologous structures
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If the Tn10 transposon is used to mutagenize a bacterium for the purpose of creating a mutation in the his operon, what would be the most appropriate selection media?
A) rich media that contains all of the amino acids supplemented with tetracycline B) minimal media supplemented only with histidine C) minimal media supplemented with tetracycline and histidine D) minimal media supplemented with tetracycline alone
Under a microscope you see a tissue consisting
of flattened cells that is a single layer thick, has a basement membrane, tight junctions, and it lines the inner surface of the lungs. This tissue type is
a. simple squamous epithelium. b. simple columnar epithelium. c. stratified squamous epithelium. d. simple cuboidal epithelium. e. stratified cuboidal epithelium
Most conifers are dioecious
____________________ Indicate whether the statement is true or false.
Which of the following cell types produce antibodies?
a) t- cells b) dendritic cells c) b- cells d) natural killer cells