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Test Bank - Human Biology: Concepts and Current Issues, 8th and 9th Edition by Johnson, All Chapters $17.99
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Test Bank - Human Biology: Concepts and Current Issues, 8th and 9th Edition by Johnson, All Chapters

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Test Bank - Human Biology: Concepts and Current Issues, 8th and 9th Edition by Johnson, All Chapters

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  • August 16, 2024
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Test Bank - Human Biology: Concepts and Current Issues, 8th
and 9th Edition by Johnson, All Chapters

All living things are composed of units called: - ANSWER: cells

The genetic material in all living cells is: - ANSWER: DNA

A forest may contain populations of bacteria, fungi, deer, frogs, and salamanders. These all combine
to form a: - ANSWER: Community

In living organisms, molecules are composed of: - ANSWER: atoms

The most inclusive level of biological classification is the: - ANSWER: domain

Which property characterizes prokaryotes? - ANSWER: single celled

Which arrangement of hierarchical levels goes from simplest to more complex? - ANSWER: cells,
tissues, organs, organ systems

An ecosystem is the level below the __________ level. - ANSWER: biosphere

The scientific name of the woodchuck is Marmota monax. What category of classification is the word
Marmota? - ANSWER: Genus

Which is not a key feature of the scientific method? - ANSWER: Statistic analysis

The hypothesis in a seed germination experiment is: Light is necessary for lettuce seed germination.
Groups of lettuce seeds are placed in light with warm temperatures and adequate moisture. Another
set of identical seeds is placed in the dark under the same conditions. In this experiment, what is the
independent variable? - ANSWER: presence of light

Atomic number - ANSWER: the number of protons in the nucleus of an atom

Proton - ANSWER: positively charged particle that resides in the nucleus of an atom; has a mass of 1
and a charge of +1

Anion - ANSWER: A negatively charged ion formed by gaining electrons

Electron - ANSWER: negatively charged particle that resides outside of the nucleus in the electron
orbital, has negligible mass, and has a charge of -1

Magnesium has an atomic number of 12. Which of the following statements is true of a neutral
magnesium atom? - ANSWER: It has 12 protons, 12 electrons, and 12 neutrons

An isotope of sodium (Na) has a mass number of 22. How many neutrons does it have? - ANSWER: 11

The transfer of an electron from one atom to another will change - ANSWER: the electrical charge of
both atoms

A buffer is best defined as a solution that - ANSWER: resists a change in pH by absorbing or releasing
hydrogen or hydroxide ions.

polar - ANSWER: molecules like water that have opposite partial charges at different ends of the
molecule

, cellulose and glycogen - ANSWER: are both carbohydrates

How many different amino acids are there? - ANSWER: 20

Polypeptide - ANSWER: long chain of amino acids linked by peptide bonds

nucleic acids are long polymers of repeating subunits called - ANSWER: nucleotides

organic molecules - ANSWER: they are very large, containing many atoms, they usually contain
covalent bonds, they are found in living organisms

Proteins capable of speeding up specific chemical reactions are called - ANSWER: Enzymes

Which of these is not part of a nucleotide? - ANSWER: phospholipid

cell - ANSWER: Basic unit of life

Which of the following is not a eukaryote? - ANSWER: Bacteria

prokaryotes and eukaryotes share - ANSWER: plasma membrane

found in both prokaryotes and eukaryotes - ANSWER: ribosomes

Which of these cell parts is not paired correctly with its function? - ANSWER: Mitochondrion-site of
photosynthesis

ribosome - ANSWER: site of protein synthesis

plasma membrane - ANSWER: regulates what enters and leaves the cell

Which of these is not a difference between plant and animal cells? - ANSWER: Animal cells have no
chloroplasts

structure of cell membrane - ANSWER: bilayer of phospholipids with embedded proteins

isotonic - ANSWER: when two different solutions have the same concentration of solutes

Hypotonic - ANSWER: Having a lower concentration of solute than another solution

What happens when an animal cell is placed in a hypotonic solution? - ANSWER: the cell will swell and
may lyse

Diffusion - ANSWER: Movement of molecules from an area of higher concentration to an area of
lower concentration.

Grace over-watered her plants, causing an extreme hypotonic environment for the plant cells. What
protects the plant cells from bursting? - ANSWER: cell wall

When a cell moves substances against a concentration gradient, the cell: - ANSWER: uses energy

Exocytosis - ANSWER: a type of active transport that moves substances, including fluids and particles,
out of a cell

In a chemical reaction, the molecules entering the reaction: - ANSWER: are the reactants

Organisms, like plants, that perform photosynthesis are called - ANSWER: producers

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