WCU Phys 261 Midterm Study Guide questions and answers
A+ Grade 2026\2027
Ammonia usually acts as a(n) _________.
- correct answer Base.
The major difference between starch, glycogen, and cellulose and their adjacent glucose subunits is the
_________.
- correct answer Type of chemical bonding.
The pH of a solution is directly proportional to the hydrogen ion concentration of the solution.
- correct answer False.
Regarding acids and bases, _________.
- correct answer Bases will accept hydrogen ions in a solution.
A ribonucleotide contains the sugar _________.
- correct answer Ribose.
In RNA the base _________ is found in place of _________.
- correct answer Uracil; thymine.
RNA is composed of a _________ polynucleotide strand.
- correct answer Single.
DNA is _________ stranded.
- correct answer Double.
The sequence of amino acids and the structure of a given protein is determined by _________.
- correct answer Genetic information.
,The pH of a solution increases as the _________ ion concentration decreases.
- correct answer Hydrogen.
Which type of organic molecule is most abundant in a potato?
- correct answer Polysaccharides.
Two monosaccharides can be joined in a covalent bond to form a(n) _________.
- correct answer Disaccharide.
Homeostatic regulatory mechanisms known as _________ are "built-in" to the organs being regulated.
- correct answer Intrinsic.
Tertiary structure stabilization can be disrupted by changes in pH and temperature. This is called
_________.
- correct answer Denaturation.
The organic molecules that comprise the majority of broccoli could be accurately described as
_________.
- correct answer Polysaccharides or cellulose.
In an acidic solution, the _________.
- correct answer OH- ion concentration is less than the H+ ion concentration.
The sympathetic nervous system can increase heart rate, while the parasympathetic nervous system can
decrease heart rate. This is an example of _________.
- correct answer Antagonistic effectors.
In maintaining homeostasis, a muscle or gland generally functions as _________.
- correct answer An effector.
Keratin and collagen are considered _________ proteins.
- correct answer Structural and fibrous.
, A decrease in mean arterial pressure is detected by a(n) _________.
- correct answer Sensor.
What characteristic is common to both amino acids and steroids?
- correct answer They contain a variety of functional groups.
Humans are NOT able to extract energy from _________.
- correct answer Cellulose.
Negative feedback results in a response that opposes the original deviation from normal.
- correct answer True.
A protein that is combined with another type of molecule, such as a carbohydrate, becomes _________.
- correct answer Conjugated.
What are prostaglandins?
- correct answer Fatty acids named for their original isolation from prostatic secretions.
Unsaturated fatty acids contain more hydrogen atoms than saturated fatty acids of the same length.
- correct answer False.
What holds a protein in its tertiary structure?
- correct answer Weak chemical bonds between widely spaced amino acids and disulfide bonds between
sulfur groups on cysteines.
What do the regulatory mechanisms of the body do?
- correct answer Work to maintain a dynamic constancy of the internal environment.
ATP is the most common purine-containing nucleotide. Its common function is as a(n) _________.
- correct answer Energy carrier.
A+ Grade 2026\2027
Ammonia usually acts as a(n) _________.
- correct answer Base.
The major difference between starch, glycogen, and cellulose and their adjacent glucose subunits is the
_________.
- correct answer Type of chemical bonding.
The pH of a solution is directly proportional to the hydrogen ion concentration of the solution.
- correct answer False.
Regarding acids and bases, _________.
- correct answer Bases will accept hydrogen ions in a solution.
A ribonucleotide contains the sugar _________.
- correct answer Ribose.
In RNA the base _________ is found in place of _________.
- correct answer Uracil; thymine.
RNA is composed of a _________ polynucleotide strand.
- correct answer Single.
DNA is _________ stranded.
- correct answer Double.
The sequence of amino acids and the structure of a given protein is determined by _________.
- correct answer Genetic information.
,The pH of a solution increases as the _________ ion concentration decreases.
- correct answer Hydrogen.
Which type of organic molecule is most abundant in a potato?
- correct answer Polysaccharides.
Two monosaccharides can be joined in a covalent bond to form a(n) _________.
- correct answer Disaccharide.
Homeostatic regulatory mechanisms known as _________ are "built-in" to the organs being regulated.
- correct answer Intrinsic.
Tertiary structure stabilization can be disrupted by changes in pH and temperature. This is called
_________.
- correct answer Denaturation.
The organic molecules that comprise the majority of broccoli could be accurately described as
_________.
- correct answer Polysaccharides or cellulose.
In an acidic solution, the _________.
- correct answer OH- ion concentration is less than the H+ ion concentration.
The sympathetic nervous system can increase heart rate, while the parasympathetic nervous system can
decrease heart rate. This is an example of _________.
- correct answer Antagonistic effectors.
In maintaining homeostasis, a muscle or gland generally functions as _________.
- correct answer An effector.
Keratin and collagen are considered _________ proteins.
- correct answer Structural and fibrous.
, A decrease in mean arterial pressure is detected by a(n) _________.
- correct answer Sensor.
What characteristic is common to both amino acids and steroids?
- correct answer They contain a variety of functional groups.
Humans are NOT able to extract energy from _________.
- correct answer Cellulose.
Negative feedback results in a response that opposes the original deviation from normal.
- correct answer True.
A protein that is combined with another type of molecule, such as a carbohydrate, becomes _________.
- correct answer Conjugated.
What are prostaglandins?
- correct answer Fatty acids named for their original isolation from prostatic secretions.
Unsaturated fatty acids contain more hydrogen atoms than saturated fatty acids of the same length.
- correct answer False.
What holds a protein in its tertiary structure?
- correct answer Weak chemical bonds between widely spaced amino acids and disulfide bonds between
sulfur groups on cysteines.
What do the regulatory mechanisms of the body do?
- correct answer Work to maintain a dynamic constancy of the internal environment.
ATP is the most common purine-containing nucleotide. Its common function is as a(n) _________.
- correct answer Energy carrier.
