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BIOL149_CH1-5_Quiz

Quiz Answers

QuestionAnswer
Measurements show that the pH of a particular lake is 4.0. What is the hydrogen ion concentration of the lake? 10^-4, the solution is always equal to the negative exponent of the pH scale
Assume that acid rain has lowered the pH of a particular lake to pH 4.0. What is the hydroxide ion concentration of this lake? this question is looking for the concentration of OH- (Hydroxide) the H+ balance is 10^-4 so the OH- must add up to 14. So the concentration would be 10^-10
As the pH lowers on the scale the hydrogen levels (H+) go down. the Hydroxide levels (OH-) go up.
As the pH raises on the scale the hydrogen levels (H+) go up. the Hydroxide levels (OH-) go down.
Which of the following statements is true about buffer solutions? Answer They maintain a relatively constant pH when either acids or bases are added to them.
Buffer Solutions are used as a means of keeping pH at a nearly constant value in regards to acids and bases
Which of the following solutions has the greatest concentration of protons, [H+]? gastric juice at pH 2 (this is simple because the lower the pH the higher the acid level)
What is the pH of a solution with a hydroxide ion, [OH-], concentration of 10-12 M? this is another one of those "must be 14" questions. ph 2 = 10^-2. 2=12=14
Amino acids are acids because they always possess which functional group? carboxyl
One of the following people set up a closed system to mimic Earth's early atmosphere and discharged electrical sparks through it. A variety of organic compounds common in organisms were formed. Who did this? Stanley Miller
enantiomers -must have 4 different elements -must be a mirror image -letter arrangement doenst matter
Which two functional groups are always found in amino acids? carboxyl and amino
What is the pH of a solution with a proton, [H+], concentration of 10-8 M? Answer pH 8
Which of the following solutions has the greatest concentration of hydroxide ions, [OH-]? the hydoxide concentration increases the higher the pH level pH 8 would be have higher levels than pH 2
Testosterone and estradiol are male and female sex hormones, respectively, in many vertebrates. In what way(s) do these molecules differ from each other? Testosterone and estradiol have different functional groups attached to the same carbon skeleton.
Early 19th-century scientists believed that living organisms differed from nonliving things as a result of possessing a "life force" that could create organic molecules from inorganic matter. The term given to this belief is vitalism
At what temperature is water at its densest? 4 degrees c
What gives rise to the cohesiveness of water molecules? hydrogen bonds
The slight negative charge at one end of one water molecule is attracted to the slight positive charge of another water molecule. What is this attraction called? a hydrogen bond
If the pH of a solution is increased from pH 5 to pH 7, it means that the pH of the solution should have decreased from 10^-5 to 10^-7 therefore the OH- levels should be higher and the H+ level should be 100 times less due to the move of the decimal point
Different atomic forms of an element contain the same number of protons but a different number of neutrons. What are these different atomic forms called? isotopes
About 25 of the 92 natural elements are known to be essential to life. Which four of these 25 elements make up approximately 96% of living matter? carbon, hydrogen, nitrogen, oxygen
What is the difference between covalent bonds and ionic bonds? bonds involve the sharing of electrons between atoms, and ionic bonds involve the electrical attraction between atoms.
Trace elements are those required by an organism in only minute quantities. Which of the following is a trace element that is required by humans and other vertebrates? iodine
The reactivity of an atom arises from the existence of unpaired electrons in the valence shell.
A covalent bond is likely to be polar when one of the atoms sharing electrons is much more electronegative than the other atom.
Prokaryotic and eukaryotic cells generally have which of the following features in common? DNA as their genetic material
Which of the following is reflective of the phrase "the whole is greater than the sum of its parts"? reductionism
Which branch of biology is concerned with the naming and classifying of organisms? taxonomy
The lowest level of biological organization that can perform all the activities required for life is the cell
2. Nitrogen (N) is much more electronegative than hydrogen (H). Which of the following statements is correct about the atoms in ammonia (NH3)? Each hydrogen atom has a partial positive charge
4. Which of the following statements is false? Protons and electrons are electrically charged particles. Protons have one unit of negative charge, and electrons have one unit of positive charge
9. Which of the following results from a transfer of electron(s) between atoms? ionic bond
11. Which of the following statements concerning prokaryotic and eukaryotic cells is not correct? Prokaryotic cells contain small membrane-enclosed organelles.
Prokaryotic and eukaryotic cells generally have which of the following features in common? cellular membrane
Created by: deleted user
 

 



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