The term that is synonymous with a motor neuron is a(n) ____ neuron
a. input
b. afferent
c. efferent
d. ganglia
e. peripheral
ANSWER: c
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In the context of cell communication, to what does the term ligand refer?
A. a signaling molecule B. the extracellular domain of a receptor protein C. the proteins activated as part of a signal transduction pathway D. a type of gated channel
Fluid-filled sacs that may store amino acids, sugars, toxins, and ions in plant cells are called ____
a. plastids b. central vacuoles c. peroxisomes d. vesicles e. Golgi bodies
Which of the following statements is FALSE?
A) the greater the evolutionary distance between two organisms, the greater the difference in the amino acid sequences of their proteins B) Genes that encode members of a protein fmaily are though to have arisen from a single ancestral gene C) Proteins ar ebiochemical adaptations that are subject to evolutionary change D) Small changed in amino acid sequence may have dramatic effect son protein shape E) Proteins with identical sequences of amino acids must also have identical folding patters
Nucleosomes are formed when DNA wraps _____ times around the histone octamer in a ______ coil
(a) 2.0, right-handed (b) 2.5, left-handed (c) 1.7, left-handed (d) 1.3, right-handed