A phylogenetic tree is a diagram that describes a phylogeny. A phylogeny is

A. the evolutionary history of a species or group of species.
B. the geographic distribution of populations in a species.
C. the generations of individuals in a population.
D. the distribution of species in a given area in time.
E. a list of character traits of individual species set in a tree diagram.


A. the evolutionary history of a species or group of species.

Biology & Microbiology

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The biological basis of nicotine addiction is that nicotinic receptors bind

A) nicotine molecules and the neurotransmitter acetylcholine. Binding releases dopamine, which causes pleasurable feelings. B) postsynaptic receptors that normally bind endorphins. C) the dopaminergic receptor, releasing acetylcholine, which causes the pleasurable feelings. D) the pleasure center in the brain.

Biology & Microbiology

Which of these events in translation in eukaryotes does NOT directly involve hydrolysis of GTP?

a. release of initiation factors b. binding of a proper aminoacyl tRNA with a codon at the A site c. formation of the peptide bond d. translocation of the ribosome along the mRNA e. all of these events directly involve GTP hydrolysis

Biology & Microbiology

A(n) ____ skeleton is an internal fluid filled chamber against which muscles exert force

a. exoskeleton b. hydrostatic c. hydrophobic d. hydrophilic e. endoskeleton

Biology & Microbiology

The pathologic state involving the disruption and destruction of tissues by microbes is referred to as a(n) _____ disease

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

Biology & Microbiology