Which of the following eukaryotic cells does NOT have a cell wall?
A. Bacteria
B. Fungi
C. Plants
D. Human
Ans: D. Human
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In an enveloped virus, the part of the virus including the nucleic acid genome and the surrounding protein coat but not the envelope is called the
A. capsid. B. matrix. C. virion. D. nucleocapsid.
Under times of great stress or shock, which of the following neurotransmitters interferes with the perception of pain?
A) endocannabinoids B) GABA C) catecholamines D) enkephalins E) acetylcholine
Which of the following is true of the sensory system?
A. Sense organs interpret the information received. B. Sense organs respond to hormonal stimulation. C. Cells in sense organs depolarize and stimulate neurons. D. Neurons send messages to sensory cells, to which the sensory cells respond.
Building on the ideas first proposed by Hutton, Lyell aimed to explain Earth's geological features using an approach known as uniformitarianism, which depends on:
a. large-scale geological events. b. the same geological processes currently observable. c. geological processes operating over very long periods of time. d. B and C