BIOL149_CH1-5_Quiz Word Scramble
N O H R E G Y D
|
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
| Question | Answer |
| 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 |
| As the pH raises on the scale | the hydrogen levels (H+) go up. the Hydroxide levels (OH-) go down. |
| 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 |
| What is the pH of a solution with a proton, [H+], concentration of 10-8 M? Answer | pH 8 |
| Amino acids are acids because they always possess which functional group? | carboxyl |
| What gives rise to the cohesiveness of water molecules? | hydrogen bonds |
| 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 |
| 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 |
| Which of the following is reflective of the phrase "the whole is greater than the sum of its parts"? | reductionism |
| Prokaryotic and eukaryotic cells generally have which of the following features in common? | cellular membrane |
| 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) |
| At what temperature is water at its densest? | 4 degrees c |
| Prokaryotic and eukaryotic cells generally have which of the following features in common? | DNA as their genetic material |
| enantiomers | -must have 4 different elements -must be a mirror image -letter arrangement doenst matter |
| 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 |
| 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 |
| 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 |
| The reactivity of an atom arises from | the existence of unpaired electrons in the valence shell. |
| 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. |
| Which two functional groups are always found in amino acids? | carboxyl and amino |
| 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. |
| 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. |
| The lowest level of biological organization that can perform all the activities required for life is the | cell |
| Which branch of biology is concerned with the naming and classifying of organisms? | taxonomy |
| A covalent bond is likely to be polar when | one of the atoms sharing electrons is much more electronegative than the other atom. |
| As the pH lowers on the scale | the hydrogen levels (H+) go down. the Hydroxide levels (OH-) go up. |
| 11. Which of the following statements concerning prokaryotic and eukaryotic cells is not correct? | Prokaryotic cells contain small membrane-enclosed organelles. |
| 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 |
| 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 |
| 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 |
| Buffer Solutions | are used as a means of keeping pH at a nearly constant value in regards to acids and bases |
| 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 |
| 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 |
| 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 |
| 9. Which of the following results from a transfer of electron(s) between atoms? | ionic bond |
Created by:
deleted user