FREE AND STUDY GAMES ABOUT BIOL149_CH1-5_QUIZ

PDF Download

FREE AND STUDY GAMES ABOUT BIOL149_CH1-5_QUIZ

EXAM QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -35 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation

Question 1: Which of the following statements is true about buffer solutions?

Answer

Answer:

They maintain a relatively constant pH when either acids or bases are added to them.Question 2: If the pH of a solution is increased from pH 5 to pH 7, it means that the

Answer:

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 Question 3: 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

Answer:

vitalism

Question 4: What is the difference between covalent bonds and ionic bonds?

Answer:

bonds involve the sharing of electrons between atoms, and ionic bonds involve the electrical attraction between atoms.

Question 5: At what temperature is water at its densest?

Answer:

• degrees c

Question 6: As the pH lowers on the scale

Answer:

the hydrogen levels (H+) go down.the Hydroxide levels (OH-) go up.Question 7: Which of the following solutions has the greatest concentration of protons, [H+]?

Answer:

gastric juice at pH 2 (this is simple because the lower the pH the higher the acid level) Question 8: 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?

Answer:

isotopes Question 9: 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?

Answer:

a hydrogen bond Question 10: Which of the following is reflective of the phrase "the whole is greater than the sum of its parts"?

Answer:

reductionism

Question 11: 9. Which of the following results from a transfer of electron(s) between atoms?

Answer:

ionic bond

Question 12: As the pH raises on the scale

Answer:

the hydrogen levels (H+) go up.the Hydroxide levels (OH-) go down.Question 13: Testosterone and estradiol are male and female sex hormones, respectively, in many vertebrates. In what way(s) do these molecules differ from each other?

Answer:

Testosterone and estradiol have different functional groups attached to the same carbon skeleton.Question 14: Prokaryotic and eukaryotic cells generally have which of the following features in common?

Answer:

DNA as their genetic material Question 15: Measurements show that the pH of a particular lake is 4.0. What is the hydrogen ion concentration of the lake?

Answer:

10^-4, the solution is always equal to the negative exponent of the pH scale Question 16: 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?

Answer:

carbon, hydrogen, nitrogen, oxygen

Question 17: Which two functional groups are always found in amino acids?

Answer:

carboxyl and amino

Question 18: The lowest level of biological organization that can perform all the activities required for life is the

Answer:

cell

Question 19: enantiomers

Answer:

-must have 4 different elements -must be a mirror image -letter arrangement doenst matter Question 20: 11. Which of the following statements concerning prokaryotic and eukaryotic cells is not correct?

Answer:

Prokaryotic cells contain small membrane-enclosed organelles.

Question 21: The reactivity of an atom arises from

Answer:

the existence of unpaired electrons in the valence shell.Question 22: What is the pH of a solution with a proton, [H+], concentration of 10-8 M?Answer

Answer:

pH 8

Question 23: What gives rise to the cohesiveness of water molecules?

Answer:

hydrogen bonds

Question 24: A covalent bond is likely to be polar when

Answer:

one of the atoms sharing electrons is much more electronegative than the other atom.