The portion of the biosphere that is composed of any
form of water is the
a. atmosphere.
b. lithosphere.
c. geosphere.
d. hydrosphere.
e. thermosphere.
Answer: d
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All of the membranes of the eukaryotic cell are in dynamic continuity except for the:
A. mitochondria and chloroplasts. B. endoplasmic reticulum. C. golgi apparatus. D. nuclear membrane.
In a resting neuron, which ion is slowly leaking into the cell?
a. potassium only b. sodium only c. chloride only d. calcium only e. both sodium and potassium
Upon completion of DNA replication the original DNA molecules is said to be:
a. translated b. cut in half c. half old and half new d. none of these apply e. transcribed
What does polarization refer to?
A) the electrical signal generated by neurons B) the lack of concentration gradient for sodium C) the decrease in charge difference across a membrane D) the difference in charge across a membrane