Which of the following is TRUE regarding osmosis?
a. the relative concentrations of solutes inside and outside the cell have no influence on osmosis
b. if a cell is in a hypotonic solution, water will leave the cell
c. if a cell is in an hypotonic solution, no water will move across the cell membrane
d. if a cell is in a hypertonic solution, water will leave the cell
Answer: d. if a cell is in a hypertonic solution, water will leave the cell
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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.
Most genetic engineering involves the use of ____
a. yeast and plants b. plants and E. coli c. yeast and mice d. bacteria and mice e. yeast and bacteria
Why are the complementary base-pairing rules so important when a cell needs to copy its DNA?
A) The cells need both strands to be accurate because each strand codes for one half of the gene. B) As long as there is one strand, a copy can be made by following the pairing rules. C) Unless the bases pair up correctly, the DNA strand can break apart. D) Transcription cannot proceed unless the pairs are in the proper sequence.
What is the effect of higher concentration of bicoid protein in part of a fruit fly embryo?
A) It lowers the chances of embryo survival. B) It will develop into the heart of the organism. C) It will develop into the posterior end of the organism. D) It will develop into the head end of the organism.