BMS100 Past Test Questions

BMS100 Past Test Questions
Chapter 2, Fall 2010
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Which statement is true?
1. The simplest particle that is definitely iron, not copper or zinc or any other element, is an iron atom.
2. The atoms of different elements have different atomic structures.
3. Both of the above.
4. None of the above.
Which one of the following is not one of the "top four" elements that constitutes most of the mass of a human body?
1. carbon
2. hydrogen
3. nitrogen
4. oxygen
5. sodium
Electrons
1. exist in "shells" where they "orbit" around the nucleus
2. have a positive charge
3. have a negative charge
4. both A. and B.
5. both A. and C.
With most elements, the atoms tend to
1. remain unbound (unattached) to other atoms
2. bond (join with) one or more other atoms
3. collect electrons and add them to their outer "shell"
4. lose electrons until they are nothing but a nucleus
Which one of the following ions is a negative ion when in body fluids?
1. sodium
2. potassium
3. calcium
4. chloride
Which one of the following is the most important role of ions in the body?
1. They serve as an importance source of energy.
2. They allow body fluids to conduct electricity.
3. They function as enzymes to speed up and control chemical reactions.
4. They remove free radicals such as superoxide that could damage DNA, proteins. etc.
What is the symbol for a sodium ion?
1. S⁺
2. N⁺
3. Na⁺
4. Na⁺⁺
The potassium in body fluids
1. forms strong covalent bonds with sodium
2. exists as positive ions with a +1 charge
3. exists as positive ions with a +2 charge
4. exists as negative ions with a -1 charge
Bicarbonate
1. exists in body fluids and consists of two carbon atoms bonded together
2. exists in body fluids as a positive ion
3. exists in body fluids as a negative ion
4. does not normally exist in body fluids
Which one of the following has the chemical formula C₆H₁₂O₆?
1. glucose
2. ammonia
3. an amino acid
4. a saturated fatty acid
Which one of the following has the chemical formula NH₃?
1. glucose
2. ammonia
3. an amino acid
4. a saturated fatty acid
Which one of the following is not an organic compound?
1. water
2. glucose
3. amino acid
4. fatty acid
What would cause a solution to have a very low pH?
1. low concentration of hydrogen ions (H⁺)
2. high concentration of hydrogen ions (H⁺)
3. low total concentration of all electrolytes
4. high total concentration of all electrolytes
Which one of the following pH values represents a non-acidic solution?
1. pH 2
2. pH 4
3. pH 6
4. pH 8
An acid is best neutralized by mixing with
1. a solution with a very low pH
2. a base (alkaline solution)
3. a solution that contains negative ions
4. monounsaturated or polyunsaturated fatty acids
Besides water, the human body is composed mainly of
1. protein and fat
2. fat and carbohydrates
3. protein and carbohydrates
4. protein and minerals such as calcium, phosphorus, etc.
The category "monosaccharides" includes
1. glucose and other simple sugars
2. glycogen and other complex carbohydrates
3. both of the above
4. none of the above
What organ(s) can use glucose as an energy source?
1. brain
2. heart
3. muscles
4. all of the above
Glycogen molecules
1. are long chains of glucose molecules linked together
2. are "built up" when the blood sugar concentration is relatively low
3. are "broken down" when the blood sugar concentration is relatively low
4. both A. and B.
5. both A. and C.
Collagen, enzymes, and antibodies are all types of
1. proteins
2. steroids
3. complex carbohydrates
4. polyunsaturated fatty acids
Though protein molecules vary in total length, each is a "chain" composed of
1. twenty different types of monosaccharides
2. twenty different types of amino acids
3. twenty different types of fatty acids
4. three different types of fatty acids
All proteins have the same
1. primary structure
2. secondary structure
3. tertiary structure
4. none of the above
True or false? The tertiary structure of a polypeptide (protein) is independent of the primary structure.
1. True.
2. False.
Of the items on the following list, the one with the most diverse, complex, and variable three-dimensional shapes is
1. complex carbohydrates
2. proteins (polypeptides)
3. nucleic acids (DNA, etc.)
4. polyunsaturated fatty acids
In the "lock-and-key" analogy, the "lock" is typically
1. a hormone that regulates a body function
2. the first amino acid in the primary structure of a polypeptide (protein)
3. a portion of a protein molecule into which some other molecule must fit precisely
4. a protein embedded in a membrane that functions to prevent molecules from passing through the membrane
The triglycerides
1. belong to the category known as "lipids"
2. include oils such as olive oil, etc.
3. include fats such as beef fat, etc.
4. all of the above
Each "fat molecule" consists of
1. three glycerols bonded to one fatty acid
2. three fatty acids bonded to one glycerol
3. three glycerols plus three fatty acids
4. hundreds of monosaccharides bonded together
Triglycerides contain more calories per gram than do
1. carbohydrates
2. protein
3. both of the above
4. none of the above
An oil that solidifies in a cool environment probably
1. contains a large percentage of cholesterol
2. contains a large percentage of saturated fatty acids
3. contains a large percentage of polyunsaturated fatty acids
4. does not contain any fatty acids
Cholesterol molecules
1. may be transformed into other steroids that function as hormones
2. are a waste product of fat metabolism and have no known function in the body
3. are also known as "trans fat" and are associated with heart disease
4. are not produced in the body
Cholesterol that is being transported out of blood and to the intestine, from which the cholesterol may be excreted, is sometimes referred to as
1. trans fat
2. omega-3 fatty acid
3. a triglyceride
4. "good cholesterol"
5. "bad cholesterol"

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