Which of the following does NOT describe enzymes?
Each enzyme is chemically specific.
Some enzymes make up part of the plasma membrane.
Some enzymes are protein plus a cofactor.
Enzymes work by raising the activation energy.
The Correct Answer is D
A. Each enzyme is chemically specific: Enzymes act only on particular substrates due to the unique shape of their active sites. This chemical specificity ensures that metabolic reactions occur in a controlled and precise manner.
B. Some enzymes make up part of the plasma membrane: Enzymes can be embedded in the plasma membrane, where they catalyze reactions such as breaking down extracellular substances or facilitating signal transduction.
C. Some enzymes are protein plus a cofactor: Many enzymes require non-protein helpers, such as metal ions or vitamins, to function effectively. In such cases, the enzyme is described as a holoenzyme, consisting of the protein part (apoenzyme) plus a cofactor.
D. Enzymes work by raising the activation energy: Enzymes actually lower the activation energy needed for reactions, making biochemical processes proceed more efficiently.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. DNA is a long, double-stranded molecule made up of A, T, G, and C bases: DNA consists of two complementary strands forming a double helix. Its sequence of adenine (A), thymine (T), guanine (G), and cytosine (C) encodes genetic information for protein synthesis and inheritance.
B. tDNA is considered a "molecular slave" of DNA during protein synthesis: There is no molecule called tDNA. Transfer RNA (tRNA) carries amino acids during protein synthesis, but the term “tDNA” is incorrect and does not exist in molecular biology.
C. Three forms exist: DNA, RNA, and tDNA: Only DNA and RNA are recognized types of nucleic acids. tDNA is not a valid classification, so this statement is inaccurate.
D. RNA is a long, single-stranded molecule made up of the bases A, T, G, and C: RNA is single-stranded, but it contains uracil (U) instead of thymine (T). Its bases are adenine (A), uracil (U), guanine (G), and cytosine (C).
Correct Answer is D
Explanation
A. The shoulder blade: The shoulder blade is referred to as the scapular region. It does not correspond to the term olecranal, which is specific to another anatomical landmark.
B. The bottom of the foot: The underside of the foot is described as the plantar region. Olecranal does not apply to this part of the body.
C. The back of the knee: The back of the knee is called the popliteal region. While it is also a posterior structure, it is different from the olecranal region.
D. The back of the elbow: The olecranal region specifically refers to the posterior aspect of the elbow, where the olecranon process of the ulna is located.
E. The top of the head: The top of the head is identified as the cranial region. It has no relation to the olecranal region of the elbow.
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