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02: Essential Chemistry for Biology
This activity contains 18 questions.
encouraging the growth of helpful bacteria
activating enzymes in saliva
coating the teeth
promoting the replacement of lost minerals on the tooth surface
Substances that cannot be broken down into other substances are called _____.
Four elements combine to make about 96% of the weight of the human body. Which of the following elements is one of the four?
Substances that contain two or more elements in a fixed ratio are called _____.
The simplest unit of matter that still retains the properties of an element is a(n) _____.
In an atom with a neutral overall charge, the number of protons is equal to the _________.
atomic mass minus 5
number of electrons minus the number of neutrons
number of electrons plus the number of neutrons
number of electrons
Silicon has an atomic number of 14 and a mass number of 28. How many neutrons are found in silicon?
Carbon-12 and carbon-13 are different in the number of their _____.
protons and electrons
What is the term for atoms that are electrically charged as a result of gaining or losing electrons?
Which of these is a type of chemical bond that involves the sharing of electrons?
What type of bond joins neighboring water molecules?
In the reaction glucose + fructose
sucrose + water, _____ is a reactant and _____ is a product.
sucrose ... water
sucrose ... fructose
glucose ... fructose
glucose ... water
water ... glucose
The tendency of molecules of the same kind to stick together is called _________.
Which of these is an example of a solution?
Physicians have used imaging techniques for medical diagnosis for some time, but recently have begun usage of magnetic resonance imaging (MRI), which depends on _______.
the pH of body fluids
the behavior of hydrogen atoms in water molecules in a strong magnetic field
pretreatment of the tissue with radio waves
Which one of the following represents the pH inside most living cells?
A substance that resists changes in pH is referred to as a(n) _____.
If you were asked to determine if there is life on Mars, what would you propose to do?
Look for water.
Monitor Mars for emission of radio waves.
Check for the presence of chemical compounds.
Attempt to detect oxygen in the atmosphere.
Look for Martians that have bodily characteristics similar to humans.
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