The volume of fluids secreted by the gastrointestinal tract in a typical day is far greater than the volume of food and drink ingested.
Answer the following statement true (T) or false (F)
True
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The nuclear envelope consists primarily of
A. a double helix of DNA. B. ribosomal subunits. C. two phospholipid bilayers. D. messenger RNA.
Which of the following is not true of electrical synapses?
A. Ions diffuse directly from one cell to the next. B. Adjacent cells are joined by gap junctions. C. They are useful for integrating information and making decisions. D. Cardiac muscle cells are joined by such synapses. E. They facilitate quick transmission of signals.
Solution 1 has a higher concentration of NaCl than solution 2 . A membrane permeable only to Na+ and water separates the two membranes. Which of the following is true?
a. Na+ will diffuse into solution 2 until the two solutions become isotonic. b. Solution 2 has a higher osmolarity. c. A membrane potential will develop, with the negative side being in solution 1. d. Solution 2 will gain water from solution 1. e. Eventually, solution 2 will contain only Na+ and solution 1 will contain only Cl-
Which of the following is the most important role of meiosis in sexual reproduction?
A. It prevents the chromosome number from doubling in each generation. B. It reduces the size of the gametes. C. It produces at least one gamete that is mobile. D. It changes the genetic composition of each chromosome. E. It ensures that each daughter cell doubles the number of chromosomes.