Physical and chemical barriers that form the first line of innate defense include
A. the acidity of the stomach.
B. tear fluid from the eye.
C. an unpunctured skin.
D. mucus and cilia of the respiratory tract.
E. All of the answer choices are correct.
E. All of the answer choices are correct.
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How could a paleontologist distinguish between a bryozoan fossil and a brachiopod fossil?
A. Bryozoans are large and solitary. B. Zoecia are always found in aggregates. C. You can only distinguish the two by examining the lophophore. D. Bryozoans often look like bivalves. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you already know about lophophorates? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
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
Modern oceanography and marine biology were attributed to:
a. the voyage of the Beagle. b. the discoveries of Alvin. c. the laying of the transatlantic telegraph cable. d. expeditions of Alexander Agassiz. e. the Challenger expedition.
What is the half-life of an element?
a. The distance from the atomic nucleus to where 50 percent of its electrons can be found b. Half of the length of time required for an element to completely decay into another element c. The period of time required for 50 percent of an element to decay into another element d. The quantity of an element sufficient to kill half of the organisms to which it is exposed