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Biology Exam 1
Chapter 2
| Question | Answer |
|---|---|
| A bond in which electrons are shared unequally A) Ionic bond B) Polar covalent bond C) Hydrogen bond D) Nonpolar covalent bond | Polar covalent bond |
| A bond in which electrons are completely lost or gained by the atoms involved A) Ionic bond B) Polar covalent bond C) Hydrogen bond D) Nonpolar covalent bond | Ionic bond |
| A bond in which electrons are shared equally A) Ionic bond B) Polar covalent bond C) Hydrogen bond D) Nonpolar covalent bond | Nonpolar covalent bond |
| A type of bond important in tying different parts of the same molecule together into a three- dimensional structure A) Ionic bond B) Polar covalent bond C) Hydrogen bond D) Nonpolar covalent bond | Hydrogen bond |
| Electrically charged particle due to loss of an electron A) Neutron B) Cation C) Molecule D) Atom | Cation |
| Neutral subatomic particle A) Neutron B) Cation C) Molecule D) Atom | Neutron |
| Smallest particle of an element that retains its properties A) Neutron B) Cation C) Molecule D) Atom | Atom |
| Smallest particle of a compound that still retains its properties A) Neutron B) Cation C) Molecule D) Atom | Molecule |
| Can be measured only by its effects on matter A) Weight B) Matter C) Energy D) Mass | Energy |
| Anything that occupies space and has mass A) Weight B) Matter C) Energy D) Mass | Matter |
| Although a man who weighs 175 pounds on Earth would be lighter on the moon and heavier on Jupiter, his ________ would not be different A) Weight B) Matter C) Energy D) Mass | mass |
| Is a function of, and varies with, gravity A) Weight B) Compound C) Energy D) Mass | weight |
| Legs moving the pedals of a bicycle A) Electrical energy B) Radiant energy C) Mechanical energy D) Chemical energy | Mechanical energy |
| When the bonds of ATP are broken, this type of energy is released to do cellular work A) Electrical energy B) Radiant energy C) Mechanical energy D) Chemical energy | Chemical energy |
| Energy that travels in waves. Part of the electromagnetic spectrum A) Electrical energy B) Radiant energy C) Mechanical energy D) Chemical energy | Radiant energy |
| Represented by the flow of charged particles along a conductor, or the flow of ions across a membrane A) Electrical energy B) Radiant energy C) Mechanical energy D) Chemical energy | Electrical energy |
| The atomic weight is only an average of relative weights of an atom and its isotopes, and it may vary from the weight of a specific isotope | True |
| Chemical properties are determined primarily by neutrons | True |
| A charged particle is generally called an ion | True |
| Isotopes differ from each other only in the number of electrons contained | False |
| Lipids are a poor source of stored energy | False |
| Glucose is an example of a monosaccharide | True |
| The lower the pH, the higher the hydrogen ion concentration | True |
| Covalent bonds are generally less stable than ionic bonds | False |
| Hydrogen bonds are comparatively strong bonds | False |
| The fact that no chemical bonding occurs between the components of a mixture is the chief difference between mixtures and compounds | True |
| Alpha particles, although relatively weak energy particles, are second only to smoking as a cause of lung cancer (Radon Gas) | True |
| All organic compounds contain carbon | True |
| The pH of body fluids must remain fairly constant for the body to maintain homeostasis | True |
| Buffers resist abrupt and large changes in the pH of the body by releasing or binding ions | True |
| Choose the statement that is false or incorrect A) In chemical reactions, breaking bonds releases energy and forming new bonds requires energy. B) Exergonic reactions release more energy than they absorb. C) Endergonic reactions absorb more energy tha | In chemical reactions, breaking bonds releases energy and forming new bonds requires energy |
| In general, the lipids that we refer to as oils have ________. Page Ref: 45-47 A) a high water content B) long fatty acid chains C) a high degree of saturated bonds D) a high degree of unsaturated bonds | A high degree of unsaturated bonds |
| The genetic information is coded in DNA by the ________ A) regular alteration of sugar and phosphate molecules B) sequence of the nucleotides C) three-dimensional structure of the double helix D) arrangement of the histones | Sequence of the nucleotides |
| Which of the following is not true of proteins? A) They may be denatured or coagulated by heat or acidity B) Some types are called enzymes C) They appear to be the molecular carriers of the coded hereditary information D) Their function depends on t | They appear to be the molecular carriers of the coded hereditary information |
| Carbohydrates are stored in the liver and muscles in the form of ________. A) glucose B) triglycerides C) glycogen D) cholesterol | Glycogen |
| A chemical reaction in which macromolecules are broken down is usually associated with____ A) the release of energy B) the consumption of energy C) a synthesis D) forming a larger molecule | The release of energy |
| A chemical reaction in which macromolecules are broken down is usually associated with _______ A) the release of energy B) the consumption of energy C) a synthesis D) forming a larger molecule | The consumption of energy |
| The numbers listed represent the number of electrons in the first, second, and third energy levels, respectively. So, which of the following is an unstable or reactive atom? A) 2, 8, 8 B) 2, 8 C) 2 D) 2, 8, 1 | 2, 8, 1 |
| A solution that has a pH of 2 could best be described as being ________ A) acidic B) basic C) neutral D) slightly acidic | Acidic |
| Which of the following is the major positive ion outside cells? A) nitrogen B) hydrogen C) potassium D) sodium | Sodium |
| Which of the following would be regarded as an organic molecule? A) H2O B) NaCl C) NaOH D) CH4 | CH4 |
| What is a chain of 25 amino acids called? A) polypeptide B) nucleotide C) protein D) starch | Polypeptide |
| Which of the following constitutes a long chain of simple sugars? A) monosaccharide B) polysaccharide C) protein D) nucleic acid | Polysaccharide |
| What level of protein synthesis is represented by the coiling of the protein chain backbone into an alpha helix? A) primary structure B) secondary structure C) tertiary structure D) quaternary structure | Tertiary structure |
| Carbohydrates and proteins are built up from their basic building blocks by the ______ A) addition of a water molecule between each two units B) addition of a carbon atom between each two units C) removal of a water molecule between each two units D) | Removal of a water molecule between each two units |
| Which statement about enzymes is false? A) Enzymes raise the activation energy needed to start a reaction B) Enzymes are composed mostly of protein C) Enzymes are organic catalysts D) Enzymes may be damaged by high temperature | Enzymes raise the activation energy needed to start a reaction |
| Choose the answer that best describes HCO3- A) a bicarbonate ion B) common in the liver C) a weak acid D) a proton donor | A bicarbonate ion |
| Select the correct statement about isotopes. A) isotopes of the same element have the same atomic number but differ in their atomic masses B) all the isotopes of an element have the same number of neutrons C) all the isotopes of an element are radioac | All the isotopes of an element have the same number of neutrons |
| The four elements that make up about 96% of body matter are ________ A) carbon, oxygen, phosphorus, calcium B) nitrogen, hydrogen, calcium, sodium C) carbon, oxygen, hydrogen, nitrogen D) sodium, potassium, hydrogen, oxygen | Carbon, oxygen, hydrogen, nitrogen |
| If atom X has an atomic number of 74 it would have which of the following? A) 37 protons and 37 neutrons B) 37 electrons C) 74 protons D) 37 protons and 37 electrons | 74 protons |
| What does the formula C6H12O6 mean? A) there are 6 calcium, 12 hydrogen, and 6 oxygen atoms B) there are 12 hydrogen, 6 carbon, and 6 oxygen atoms C) the molecular weight is 24 D) the substance is a colloid | There are 12 hydrogen, 6 carbon, and 6 oxygen atoms |
| What is the ratio of fatty acids to glycerol in triacylglycerol molecules? A) 1:1 B) 2:1 C) 3:1 D) 4:1 | 3:1 |
| In a DNA molecule, the phosphate serves ________ A) as a code B) to hold the molecular backbone together C) to bind the sugars to their bases D) as nucleotides | To hold the molecular backbone together |
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