Collections of similar cells that perform a special function are called 

A. organs.
B. systems.
C. tissues.
D. organisms.


C. tissues.

Biology & Microbiology

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Which of the following statements best summarizes the relationship between the relative size of a species' genome and its proteome?

A. genome = proteome B. genome > proteome C. genome < proteome D. genome = proteome in eukaryotes; genome > proteome in prokaryotes E. genome > proteome in eukaryotes; genome = proteome in prokaryotes

Biology & Microbiology

How did Zhang and Cech purify the RNA molecules that were able to catalyze the linkage between two amino acids?

a. passing the reaction mixture through a column that binds biotin b. passing the reaction mixture through a column that binds all proteins c. passing the reaction mixture through a column that binds RNA d. centrifuging the reaction mixture to concentrate the proteins e. centrifuging the reaction mixture to concentrate the RNA molecules

Biology & Microbiology

How can a mutation in a tumor-suppressor gene behave as a recessive allele at the cellular level, but appear as a dominant allele in pedigree analysis?

A) Some functional protein can still be produced in a cell heterozygous for a loss-of-function allele; however, an additional mutation can inactivate the second allele, eliminating all functional protein allowing cancer to occur in many family members. B) A single functional allele is sufficient to regulate the cell cycle, but not sufficient to promote apoptosis, allowing cancer to develop in every generation. C) A cell with half the amount of the functional tumor-suppressor protein can form benign tumors that will occur in every generation in the pedigree. D) Some functional protein can still be produced in a cell heterozygous for a loss-of-function allele; but loss-of-function tumor-suppressor alleles are so common in the population that many individuals are homozygous.

Biology & Microbiology

Chemical defenses are found in all of the following except

A. Batesian mimics. B. snakes, spiders, and fishes. C. marine animals. D. plants. E. insects.

Biology & Microbiology