Ear development begins during the ________ week of embryonic life.
A. 4th
B. 1st
C. 6th
D. 2nd
E. 8th
Answer: A
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For gas exchange to be efficient, the respiratory membrane must be ________
A) between 5 and 6 micrometers thick B) at least 3 micrometers thick C) 0.5 to 1 micrometer thick D) The thickness of the respiratory membrane is not important in the efficiency of gas exchange.
In a(n) ________ neuron, the dendrites and axon are continuous or fused
A) multipolar B) anaxonic C) unipolar D) bipolar E) pseudopolar
What type of chemical formula is shown here?CH4
A. Elemental formula B. Molecular formula C. Atomic formula D. Structural formula
Which statement correctly compares passive and active transport?
A. Passive transport moves materials across the cell membrane without the use of energy while active transport moves materials across the cell membrane against the concentration gradient without the use of energy. B. Passive transport moves materials across the cell membrane with the use of energy while active transport moves materials across the cell membrane against the concentration gradient with the use of energy. C. Passive transport moves materials across the cell membrane with the use of energy while active transport moves materials across the cell membrane against the concentration gradient without the use of energy. D. Passive transport moves materials across the cell membrane without the use of energy while active transport moves materials across the cell membrane against the concentration gradient with the use of energy.