Test Bank For Biology An Australian Focus 5Th Edition By Bruce Knox Pauline Ladiges Barbara Evans Robert Saint
Course
Biology An Australian - Test Bank
Institution
Biology An Australian - Test Bank
Chapter 03 Testbank
Student: ___________________________________________________________________________
1. In biological systems, energy can be stored as A. potential energy.
B. kinetic energy.
C. heat.
D. mechanical energy.
E. All of the answers are correct.
2. According to the first and s...
1. When electrons in excited orbitals lose energy, that energy can
A. be used to drive another chemical process.
B. emit light.
C. be passed on to a neighbouring atom.
D. All of the answers are correct.
E. be used to drive photosynthesis in a leaf cell in sunlight.
2. An oxygen atom has 8 protons, 8 neutrons and 8 electrons.
A. Its atomic number is 16.
B. Its mass number is 8.
C. It has 4 electrons in the first energy level (electron shell).
D. It has 6 electrons in the outermost energy level (electron shell).
E. It has 8 electrons in the outermost energy level (electron shell).
3. Atoms of the same element can exist in different forms called isotopes. The most common isotope of carbon is carbon-
12 but it has two less-common isotopes, carbon-13 and carbon-14. The less-common isotopes have
A. the same number of electrons but more protons.
B. the same number of protons but more neutrons.
C. the same number of neutrons but more protons.
D. the same number of protons but more electrons.
E. the same number of neutrons but more electrons.
,4. Ionic bonds are formed by the
A. attraction between atoms with opposite polarity.
B. transfer of electrons from one atom to another.
C. sharing of electrons between oppositely charged ions.
D. attraction between positively and negatively charged ions of the same element.
E. sharing of electrons in the outer electron orbital of an atom.
5. Hydrogen bonds can form between
A. carbon and hydrogen atoms.
B. oxygen and hydrogen atoms in the same water molecule.
C. oxygen and hydrogen atoms in adjacent molecules.
D. hydrogen atoms in adjacent molecules.
E. hydrogen atoms within the same molecule.
6. One of the properties that make water an ideal medium for living organisms is that water
A. can absorb considerable amounts of heat with little change in temperature.
B. expands and becomes more dense as it changes from solid to liquid form.
C. releases heat when it evaporates.
D. is a universal solvent.
E. has a high boiling point.
7. Hydrogen bonding between water molecules gives water a high level of structural organisation. In ice, the maximum
number of hydrogen bonds formed with one water molecule is
A. 2.
B. 3.
C. 4.
D. 6.
E. 1.
, 8. Water is a versatile solvent because water molecules are
A. small.
B. polar.
C. hydrophilic.
D. loosely connected by hydrogen bonds.
E. hydrophobic.
9. Which of the following statements is CORRECT?
A. The internal pH of the cells of an organism is usually the same as the pH of the external environment.
B. The internal pH of the cells of an organism may be quite different to the pH of the external environment.
C. Regardless of the internal pH of their cells, most living organisms can only survive within a narrow range of
environmental pH.
D. Regardless of the pH of the environment, most living organisms will not survive if the internal pH of their cells
fluctuates.
E. The internal pH of a muscle cell may become more basic during exercise.
10. The interior of a lysosome in an animal cell has a pH of 5, while the cytosol of the cell has a pH of 7.4. This indicates
that in comparison to the cytosol, the interior of the lysosome has a
A. lower concentration of total dissolved ions.
B. lower concentration of hydrogen ions.
C. higher concentration of bicarbonate ions.
D. higher concentration of hydrogen ions.
E. higher concentration of hydroxyl ions.
11. Buffers are substances that assist cells and organisms to resist changes in pH by
A. accepting H+ ions as pH rises and releasing H+ ions as pH falls.
B. accepting OH– ions as pH rises and releasing H+ ions as pH falls.
C. accepting H+ ions as pH falls and releasing H+ ions as pH rises.
D. accepting OH– ions as pH falls and releasing H+ ions as pH rises.
E. accepting OH- ions as pH falls and releasing OH- ions as pH rises.
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