In order to cause vasodilation of most muscular smooth muscle,
A. Acetylcholine combines with nicotinic receptors
B. Norepinephrine combines with alpha receptors
C. Norepinephrine combines with beta 1 receptors
D. Acetylcholine combines with muscarinic receptors
E. Sympathetic stimulation is removed
Answer: E. Sympathetic stimulation is removed
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DNA consists of two antiparallel strands of nucleotides held together by
A. peptide bonds. B. covalent bonds. C. ionic bonds. D. hydrogen bonds.
In disruptive selection, over time
A. a population increases its variation (e.g., a wide selection of all beak sizes). B. the population is strongly selected for in two directions (e.g., larger beak size and smaller beak size). C. a population goes extinct. D. the most extreme outliers of a population are eliminated (e.g., the largest beaks and smallest beaks are eliminated). E. the population is strongly selected for in one direction (e.g., larger beak size).
Caldarchaeol lipids are extremely thermostable tetraethers found in many ________.
A. psychrophile archaea B. hypersalinic archaea C. autotrophic archaea D. hyperthermophilic archaea
A likely biological basis of major depressive disorder is
A) reuptake pumps for serotonin in the presynaptic neuron membrane that are overactive, depleting serotonin in the synapse. B) absent reuptake pumps for serotonin in the presynaptic neuron membrane. C) reuptake pumps for serotonin in the postsynaptic neuron membrane that do not function adequately. D) reuptake pumps for serotonin in the postsynaptic neuron membrane that are overactive, depleting serotonin in the synapse.