In terms of evolutionary trees, what exactly is a node?
a. A group of organisms that are closely related and may or may not be species
b. An event that changes a population
c. A node is another word for a common ancestor.
d. A subset of a species
e. The point at which two groups diverge on an evolutionary tree
Ans: e. The point at which two groups diverge on an evolutionary tree
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Traits that fall into discrete categories are called continuous traits
Indicate whether the statement is true or false
The reason some individual hormones have multiple effects on different target tissues is that ____
a. gene transcription is altered b. second messengers trigger cascade or amplification effects c. many different cells in different tissues have specific receptors for the hormone d. only a small amount of the hormone is required for its effect e. hormones can conform to multiple receptors
Pathogens can use ____ mechanisms to change the host DNA, for example, to change patterns of transcription by the process of methylation
a. pathogenic b. epigenetic c. mutagenic d. enzymatic
A drug that block monoamine oxidase will tend to increase the strength of a synapse that uses dopamine as the neurotransmitter or modulator.
a. true b. false