The single-celled yeast, Saccharomyces cerevisiae, was used to construct the first eukaryotic artificial chromosome. This was a significant achievement because

A) yeast centromeres are identical to human centromeres.
B) it defined chromosomal regions that serve as centromeres and origins of replication in yeast.
C) it revealed the rate of DNA replication in yeast.
D) it demonstrated that some yeast genes are not essential.
E) it defined the chromosomal region with the TRP+ gene for tryptophan synthesis in yeast.


B) it defined chromosomal regions that serve as centromeres and origins of replication in yeast.

Biology & Microbiology

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Proteins that do not refold properly after being heated generally require the assistance of which one of the following types of molecules in vivo?

A. polymerases B. ribosomes C. enhancers D. chaperones E. transferases

Biology & Microbiology

________ is a process by which microorganisms or other particles are coated by serum components, preparing them for recognition and ingestion by phagocytic cells.

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

Biology & Microbiology

Deciduous trees in North America are dormant during winter months because ____

a. they receive no precipitation during winter b. photosynthesis cannot occur during winter c. this offers a way to survive the extended drought-like conditions d. the cold temperatures would otherwise damage leaves and buds e. they have no leaves during winter months

Biology & Microbiology

The cell walls of bacteria are a copolymer of _______ and _______.

a. proteins; lipids b. proteins; polysaccharides c. polysaccharides; peptides d. cellulose; lignin

Biology & Microbiology