BIO 110 DDCC Quiz 2 Ch2 and Ch3
A(n) ________Blank can be defined as a substance that keeps pH within established limits by taking up excess H+ or OH- in a solution. A. Equalizer B. Solute C. Buffer D. Acid E. Base
C. Buffer
Which of the following best describes the structure of how water molecules form? A. Hydrogen atoms covalently bond with each other to create one stable valence shell of electrons. The hydrogen molecule then forms a hydrogen bond with an oxygen atom to create the water molecule. B. One oxygen atom transfers an electron to each of two hydrogen atoms, forming an ionic bond. C. One oxygen atom and two hydrogen atoms form a covalent bond with one another to create stable valence shells of electrons. The electrons are shared unequally resulting in a polar molecule. D. Hydrogen bonds are formed between the two hydrogen atoms and the oxygen atom. E. Because of its strong electronegativity, oxygen removes one electron from two different hydrogen atoms. This satisfies the valence shell of oxygen. Then hydrogen bonds form between the two hydrogen atoms which keeps them in the vicinity of the oxygen atom.
C. One oxygen atom and two hydrogen atoms form a covalent bond with one another to create stable valence shells of electrons. The electrons are shared unequally resulting in a polar molecule.
.Given the chemical equation: C6H12O6 + 6 O2 → 6 CO2 + 6 H2O, identify which of the following statements are correct. Check All That Apply A. CO2 is a reactant. B. H2O is a product. C. C6H12O6 is both a reactant and a product. D. O2 is a reactant
A. CO2 is a reactant, and C. C6H12O6 is both a reactant and a product.
Bananas have a pH of 5. This means a banana has an excess of ______ ions and would be called a(n) ________ A. H+; acid B. OH-; acid C. H+; base D. OH-; base E. H+; neutral solution
A. H+; acid
Which of the following is an inorganic molecule? A. Na2SO2 B. C6H12O7 C. CH3(CH2)3OH D. C22H44O22 E. C2H6
A. Na2SO2
Heartburn occurs when stomach acid escapes the stomach and burns the tissues of the esophagus. Baking soda is sometimes used as an antacid. How does baking soda help relieve symptoms of heartburn? A. The baking soda is serving as a buffer to remove excess H+ ions from stomach acid. .B. The baking soda is able to coat the lining of the esophagus thereby protecting it from the acid. C. The baking soda increases the acidity of the stomach. D. The baking soda releases salt which draws more water into the esophagus thereby diluting the acid. E. The baking soda relaxes the stomach muscles.
A. The baking soda is serving as a buffer to remove excess H+ ions from stomach acid.
A gene is the code for assembling a sequence of A. amino acids. B. glucose molecules. C. fatty acids used in a fat. D. sugars. E. functional groups.
A. amino acids
An atom that has an electrical charge is called a(n) A. ion. B. molecule. C. isotope. D. element. E. proton.
A. ion
Radioactive isotopes would be most harmful to a person when A. unmonitored release into the environment makes changes in a cell's DNA. B. they are used to trace molecular changes. C. they are used to destroy abnormal cells. D. they are used to determine the age of biological specimens. E. they are used to trace the path of materials throughout the body.
A. unmonitored release into the environment makes changes in a cell's DNA.
How does a strong acid differ from a weak acid? A. A strong acid contains fewer H+ in solution. B. A weak acid dissociates only partially in water. C. A strong acid is less likely to remain dissociated. D. A weak acid dissociates nearly completely in water. E. A strong acid dissociates only partly in water.
B. A weak acid dissociates only partially in water.
Which of the following is a property of bases? A. Bases have a sharp or sour taste. B. Bases feel slippery when touched. C. Bases taste sweet. D. Bases release H+ when dissolved in a liquid. E. Bases have a pH reading below 7.0.
B. Bases feel slippery when touched.
How does DNA differ from RNA? Multiple Choice A. DNA is in plants; RNA is found in animals. B. DNA is comprised of a double-strand; RNA is a single-strand. C. DNA is made from amino acids; RNA is made from nucleotides. D. DNA uses the nitrogenous base uracil; RNA uses the nitrogenous base thymine. E. DNA codes for lipid structure; RNA codes for protein structure.
B. DNA is comprised of a double-strand; RNA is a single-strand.
Deoxyribose is a sugar found in A. RNA only B. DNA only C. both DNA and RNA D. ATP and DNA E. ATP and RNA
B. DNA only
Which of the following can be described as a molecule but not a compound? A. H2O B. O2 C. NaCl D. CO2 E. MgCl2
B. O2
What makes saturated triglycerides less healthy than unsaturated ones? A. They taste better than other fats. B. Saturated fats tend to stick together in the blood forming plaque. C. Individuals tend to consume more saturated fats than unsaturated fats. D. Unsaturated fats are found in processed foods more frequently. E. They are digested more quickly by the body.
B. Saturated fats tend to stick together in the blood forming plaque.
After drinking a great deal of coffee (pH 5), a human's blood buffering system would need to ________Blank as the coffee was digested to lower the level of acid present in the blood stream. A. Release OH- B. Take up H+ C. Take up OH- D. Release and Take up OH-
B. Take up H+
An Atom's valance electron shell A. is the first shell to circle the nucleus. B. determines its chemical reactivity. C. determines its atomic mass. D. is filled with positively charged particles. E. always contains 8 electrons.
B. determines its chemical reactivity.
Steroid are classified as A. proteins. B. lipids. C. carbohydrates. D. nucleic acids. E. fats.
B. lipids
In the reaction C6H12O6 + 6O2 → 6CO2 + 6H2O carbon dioxide is one of the A. reactants B. products C. enzymes D. elements E. ions
B. products
Plants store glucose in the form of A. protein. B. glycogen. C. lactose. D. starch. E. fructose.
D. Starch
An atom with a neutral charge has A. equal numbers of neutrons and electrons. B. more neutrons making it more neutral. C. the same number of protons and neutrons. D. equal numbers of protons and electrons. E. more protons than it does electrons.
D. equal numbers of protons and electrons.
Some insects can walk on the surface of water because water A. Some insects can walk on the surface of water because water B. has a lower density when frozen. C. is a good solvent. D. has surface tension. E. resists temperature changes.
D. has surface tension.
The atomic structure of water satisfies the octet rule by having A. electrons shared between the two oxygen atoms. B. electrons from hydrogen transferred to the oxygen atom. C. electrons from oxygen transferred to the hydrogen atoms. D. oxygen share electrons with two hydrogen atoms. E. electrons shared between the two hydrogen atoms.
D. oxygen share electrons with two hydrogen atoms.
The principle role for sugars in living things is to A. form cell membranes. B. serve as a form of long-term energy storage. C. create our genetic code. D. serve as a form of immediate cellular energy. E. produce hormones.
D. serve as a form of immediate cellular energy.
DNA functions to ________, while RNA's function is to ________. Multiple Choice A. store the information to make a new organism; contain the information to make a new cell B. store information to produce gametes; contain the information to make a protein C. store information to produce proteins; contain the information to make DNA D. stores genetic information; aids in the processing of the information within the DNA into proteins E. store information to produce a new protein; contain the information to make mRNA
D. stores genetic information; aids in the processing of the information within the DNA into proteins
The reactivity of an atom depends on the number of A. protons. B. neutrons. C. protons plus neutrons. D. valance electrons E. protons and electrons
D. valence electrons
A covalent bond involves the sharing of A. neutrons B. protons C. pairs of protons D. at least three electrons E. pairs of electrons
E. pairs of electrons
Which one of the following is a potential danger of anabolic steroids? Check All That Apply A. liver problems B. psychological disorders C. male breast development D. heart problem E. swelling of the testicles
E. swelling of the testicles
An ionic bond forms when A. an atom gives away or takes in a neutron. B. an atom gives away or takes in a neutron. C. a positively charged ion is attracted to a negatively charged ion. D. two atoms come close enough to share one or more electrons. E. two positively charged ions are attracted to each other.
C. a positively charged ion is attracted to a negatively charged ion.
Humans store glucose in the form of A. lactose. B. starch. C. glycogen. D. fructose. E. cellulose.
C. glycogen
In addition to carbon, an organic molecule must contain Multiple Choice A. boron. B. oxygen. C. hydrogen. D. sodium. E. nitrogen.
C. hydrogen
Cells need buffering agents in order to A. speed up chemical reactions. B. carry out life functions in extremely acidic conditions. C. minimize the changes in pH of their internal environment. D. help transfer electrons from one atom to another. E. increase the amount of OH- in their surroundings.
C. minimize the changes in pH of their internal environment.
The basic building block or subunit of many biological molecules is called a(n) Multiple Choice A. quaternary structure. B. polymer. C. monomer. D. isomer. E. chain.
C. monomer.
Starch is a ________ made of many ________. A. simple sugar; amino acids B. peptide; amino acids C. polymer; glucose molecules D. protein; fatty acids E. nucleic acid; nucleotides
C. polymer; glucose molecules
Which nitrogen-containing base is found in RNA but not in DNA? Multiple Choice A. guanine B. thymine C. cytosine D. adenine E. uracil
E. uracil