A college campus - including the students, birds, trees, sidewalks, and air - makes up one complete ________.
A. organism
B. community
C. population
D. ecosystem
Answer: D
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Which of the following statements is NOT true of cephalopods?
A. Some are very large and can weigh as much as two tons. B. Some are very intelligent and are good learners. C. Some have shells and some do not. D. They are predatory. E. They have an open circulatory system.
Oxygen and carbon dioxide are able to pass through the plasma membrane of a cell because
A) they are both polar molecules. B) both are lipid soluble. C) they move through ion pores. D) each binds to a transport protein that "pulls" it across the membrane. E) they are small and nonpolar and readily pass between phospholipids.
In cellular respiration, which molecule is released after the citric acid cycle?
A) oxygen B) carbon dioxide C) water D) glucose
Ribosomal subunits ____________.
A. come together in threes to form functional units B. are composed of mRNA and structural proteins C. are synthesized in the cytoplasm D. converge with tRNA when mRNA is to be translated E. are transcribed from the complementary strand of DNA that is used for tRNA transcription