List the main differences between protostomes and deuterostomes. What will be an ideal response?

Researchers often work with temperature-sensitive mutations ________, because null alleles of these genes create mutants that cannot grow under any conditions.

A) that confer antibiotic resistance B) in essential genes C) that affect colony morphology D) that affect metabolism

Which of the following environments would be

most likely to produce trees without annual rings? a. tropical rain forest b. northern evergreen forest c. areas with alternating wet and dry seasons d. temperate-deciduous forests e. none of these, because annual rings are characteristic of all trees

Morphological or molecular characters shared by members of a clade are called ______

A) common ancestors B) paraphyletic groups C) homoplasys D) monophyletic groups E) synapomorphies

PCR is a method for identifying microbes based on their (antigens/genes/morphology).

Fill in the blank(s) with the appropriate word(s).