Organisms "X" and "Y" are suspected to be the same species. Which of the following will provide the
ultimate proof?
a. interbreeding
b. anatomy
c. physiology
d. ecology
e. behavior
A
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Why are weak chemical interactions so important in biological systems?
What will be an ideal response?
Ionic bonds are important in biological structures. Which of the following pairs of molecules would form an ionic bond?
A) two water molecules B) two amino acids with oppositely charged functional groups C) two different stereoisomers of the same sugar D) two phospholipids E) a water molecule and a lipid
Atoms in which the number of electrons does not equal the number of protons are known as:
A. valences. B. isomers. C. isotopes. D. ions.
The most common form of calcium has 20 protons, 20 nuetrons and 20 electrons. Which of the following element is an isotope of calcium?
a. an atom with 21 protons, 20 neutrons, 21 electrons b. an atom with 20 protons, 20 neutrons, 18 electrons c. an atom with 21 protons, 21 neutrons, 21 electrons d. an atom with 20 protons, 21 neutrons, and 20 electrons