The most likely place where an exoenzyme participates in a chemical reaction is
in mitochondria.
within the cell membrane.
in lysosomes.
in cytoplasm.
outside of the cell.
The Correct Answer is E
A. In mitochondria:
Mitochondria are intracellular organelles in eukaryotes where many metabolic reactions occur, but exoenzymes are secreted enzymes that act outside the cell rather than inside organelles.
B. Within the cell membrane:
Some enzymes are membrane-associated and act at or through the membrane, yet exoenzymes are secreted beyond the cell surface to act on extracellular substrates.
C. In lysosomes:
Lysosomes contain hydrolytic enzymes that function inside the cell to digest materials; exoenzymes operate outside the cell rather than within intracellular digestive organelles.
D. In cytoplasm:
Cytoplasmic enzymes catalyze intracellular reactions; exoenzymes are exported and function extracellularly.
E. Outside of the cell:
Exoenzymes are secreted by the cell into the external environment (or into host tissues) where they break down large molecules into smaller units the cell can transport or where they contribute to pathogenicity.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. Obligate aerobes: Obligate aerobes require oxygen for growth and cannot grow in its absence.
B. Obligate anaerobes: Obligate anaerobes cannot tolerate oxygen and will not grow in its presence.
C. Facultative anaerobes: Facultative anaerobes can use oxygen for aerobic respiration when it is available but can switch to fermentation or anaerobic respiration in oxygen-free conditions, allowing growth in both environments.
D. Aerotolerant anaerobes: Aerotolerant anaerobes do not use oxygen but tolerate its presence and grow equally well with or without it; they do not gain energetic advantage from oxygen.
Correct Answer is C
Explanation
A. mRNA: Messenger RNA provides the codon template that dictates amino acid sequence but does not physically deliver amino acids.
B. rRNA: Ribosomal RNA is part of the ribosome’s structural and catalytic core and assists in peptide bond formation, but it does not carry individual amino acids.
C. tRNA: Transfer RNA molecules carry specific amino acids to the ribosome and match their anticodon to mRNA codons, delivering the correct amino acids for incorporation into the growing polypeptide.
D. micRNA: MicroRNA (miRNA) are small regulatory RNAs involved in gene expression control, not carriers of amino acids to ribosomes.
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