Explain what happens at the molecular level when a salt such as NaCl dissolves in water
What will be an ideal response?
Ionic molecules, such as NaCl, dissolve in water because the positive and negative ions of the salt are separated from each other. They are separated because the slightly positive side of a water molecule (the hydrogen atoms) surround the negative chloride ion and isolate it from the positive sodium ion. At the same time, the negative side of a water molecule (the oxygen atom) surrounds the positive sodium ion, thereby isolating it from any free chlorides.
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Reverse transcriptase is an enzyme that can synthesize DNA from an RNA template. What DNA sequence is produced from an RNA molecule with the sequence AUUGACGGU?
A. UAACUGCCA B. TTTCTGCCT C. TAACTGCCA D. ATTCAGCCT E. TUUCTGCCU
The ____ produces gastrin that activates secretion of HCl and pepsinogen within itself
a. mouth b. liver c. large intestine d. small intestine e. stomach
Gymnosperms (such as conifers) and angiosperms (such as lilies) differ in that only the angiosperms have
a. lignified transport tissues. b. leaves. c. seeds. d. fruits. e. swimming sperm.
According to Woods, the key to understanding hunger is to appreciate that eating meals stresses the body, how?
What will be an ideal response?