Midterm Flashcards
In an ecosystem, energy
typically flows from producers through a series of consumers.
You notice that over the past month, many students on campus have started wearing a new style of school sweatshirt. You think to yourself that perhaps the bookstore has recently started selling this new sweatshirt style. This is an example of
a hypothesis.
Organisms belonging to the kingdom Plantae
are photosynthetic.
Which of the following statements about ecosystems is false?
Chemical nutrients cycle within an ecosystem.
Plants and other photosynthetic organisms are producers in ecosystems.
In the process of energy conversions within an ecosystem, some energy is converted to heat.
Bacteria and fungi recycle energy within an ecosystem.
Bacteria and fungi recycle energy within an ecosystem.
Kingdom Fungi includes species
that obtain food by decomposing dead organisms and absorbing the nutrients.
Members of the kingdom Animalia
can obtain their food by eating other organisms.
Which of the following statements about the domain Bacteria is true?
Archaea belong to this domain.
All bacteria lack a nucleus.
All bacteria are multicellular organisms.
All bacteria have a membrane-bound nucleus.
All bacteria lack a nucleus.
Which of the following statements regarding a common cellular activity is false?
New cells are derived from cellular components like organelles.
Life is organized in a hierarchical fashion. Which of the following sequences correctly lists that hierarchy from least inclusive to most inclusive?
molecule, organelle, cell, tissue, organ, organ system, organism, population, community, ecosystem
A hypothesis is
a proposed explanation for a set of observations.
Your instructor asks you to look into your microscope to see a prokaryotic cell. You will be looking for a cell that
has a membrane.
The role of a control in an experiment is to
provide a basis of comparison to the experimental group.
Which of the following is a kingdom within the domain Eukarya?
Fungi
What is the difference between a tissue and an organ system?
An organ system includes tissues.
Which of the following statements about the properties of life is false?
Organisms have the ability to reproduce.
Organisms have the ability to respond to stimuli from the environment.
Organisms have the ability to take in energy and use it.
Organisms have an unchanging, constant internal environment
Organisms have an unchanging, constant internal environment
A single water molecule (H—O—H) is held together by
two polar covalent bonds.
The sodium atom contains 11 electrons, 11 protons, and 12 neutrons. What is the mass number of sodium?
23
The figure below shows five water molecules. The hydrogen bonds shown in this figure are each
between an oxygen and a hydrogen atom of different water molecules.
What is the atomic mass of an atom that has 6 protons, 6 neutrons, and 6 electrons?
12
The hydrogen atoms of a water molecule are bonded to the oxygen atom by ________ bonds, whereas neighboring water molecules are held together by ________ bonds.
polar covalent; hydrogen
Compared to a solution of pH 3, a solution of pH 1 is
100 times more acidic.
Which of the following best describes the atomic number of an atom?
the number of protons in the atom
Changing the ______would change it into an atom of a different element.
number of protons in the nucleus of an atom
Water molecules stick to other water molecules because
hydrogen bonds form between the hydrogen atoms of one water molecule and the oxygen atoms of other water molecules.
A solution of pH 6 contains________H+ than the same amount of a solution at pH8.
100 times more
A can of cola consists mostly of sugar dissolved in water, with some carbon dioxide gas that makes it fizzy and makes the pH less than 7. In chemical terms, you could say that cola is an aqueous solution where water is the______, sugar is a _________, and carbon dioxide makes the solution_________.
solvent…solute…acidic
A solution with a pH of 7 is
neutral.
Household ammonia has a pH of 12; household bleach has a pH of 13. Which of the following statements about these substances is true?
A solution that could buffer the bleach and ammonia would remove excess OH- ions.
The ammonia has 10 times as many H+ ions as the bleach.
The ammonia has 10 times as many OH- ions as the bleach.
Both of these substances are strong acids.
The ammonia has 10 times as many H+ ions as the bleach.
Where are protons located in an atom
nucleus
Which of the following particles are found in the nucleus of an atom?
protons and neutrons
Which of the following statements regarding the oxygen atom of a water molecule is true?
Oxygen is more electronegative than the hydrogen atoms.
Which of the following statements best describes a compound?
A compound contains two or more different elements in a fixed ratio.
A hydrogen atom has one electron. How many covalent bonds can hydrogen form?
one
The four most common elements in living organisms are
C, H, O, N.