Answer Options:
A. It prevents potassium ions from leaking out and sodium ions from crossing into the cell.
B. It encloses the cell contents in such a way that water if the body is divided into separate compartments.
C. It is selectively permeable but permits water and gases to cross.
D. It acts as a site of cell-to-cell interaction and recognition.
Answer Options:
A. It prevents potassium ions from leaking out and sodium ions from crossing into the cell.
B. It encloses the cell contents in such a way that water if the body is divided into separate compartments.
C. It is selectively permeable but permits water and gases to cross.
D. It acts as a site of cell-to-cell interaction and recognition.
Answer: B. It encloses the cell contents in such a way that water if the body is divided into separate compartments.
Question: A gene can best be defined as ________.
Answer Options:
A. a segment of DNA that carries the instructions for one polypeptide chain
B. noncoding segments of DNA up to 100,000 nucleotides long
C. a three-base triplet that specifies a particular amino acid
D. an RNA messenger that codes for a particular polypeptide
Answer Options:
A. a segment of DNA that carries the instructions for one polypeptide chain
B. noncoding segments of DNA up to 100,000 nucleotides long
C. a three-base triplet that specifies a particular amino acid
D. an RNA messenger that codes for a particular polypeptide
Answer: A. a segment of DNA that carries the instructions for one polypeptide chain
Question: Pointing the toes is an example of ________.
Answer Options:
plantar flexion
pronation
protraction
circumduction
Answer: plantar flexion
Question: Which of the following is not true of proteins?
Answer Options:
A. They may be denatured or coagulated by heat or acidity.
B. They appear to be the molecular carriers of coded hereditary information.
C. Their function depends on their three-dimensional shape.
D. They have both functional and structural roles in the body.
Answer: B. They appear to be the molecular carriers of coded hereditary information
Question: Alpha helices and beta sheets are examples of:
Answer Options:
Protein primary structures
Protein secondary structures
Protein tertiary structures
Protein quaternary structures
Answer: Protein secondary structures
Question: A pair of tweezers is a good example of a second-class lever.
Answer Options:
A. True
B. False
Answer: B. False
Question: Amino acids joining together to make a peptide is a good example of a(n) ______ reaction.
Answer Options:
A. decomposition
B. exchange
C. synthesis
D. reversible
Answer: C. synthesis
Question: Pointing the toes is an example of _______.
Answer Options:
a) pronation
b) circumduction
c) plantar flexion
d) protraction
Answer: c) plantar flexion
Question: Which property of water is demonstrated when we sweat?
Answer Options:
a) cushioning
b) high heat capacity
c) reactivity
d) polar solvent properties
e) high heat of vaporization
Answer: e) high heat of vaporization
Question: Bending your head back until it hurts is an example of _______.
Answer Options:
a) hyperextension
b) flexion
c) circumduction
d) extension
Answer: a) hyperextension
Question: Bending your head back until it hurts is an example of ________.
Answer Options:
circumduction
extension
hyperextension
flexion
Answer: hyperextension
Question: Bending your head back until it hurts is an example of ________.
Answer Options:
circumduction
extension
hyperextension
flexion
Answer: hyperextension