Two enzymes act on a substrate and both are activated within the cell; therefore they are both exoenzymes.
false
true
The Correct Answer is B
Exoenzymes are enzymes secreted by cells into the extracellular environment to break down large molecules outside the cell, facilitating nutrient absorption or tissue invasion. In contrast, enzymes that act on substrates within the cell are classified as endoenzymes, functioning intracellularly to catalyze metabolic reactions essential for cell survival. The fact that two enzymes act on a substrate and are activated inside the cell does not make them exoenzymes. Intracellular activation and substrate interaction are characteristic of endoenzymes, not exoenzymes. Therefore, both enzymes described are intracellular (endoenzymes), not secreted exoenzymes.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Autotroph: Autotrophs are organisms that use carbon dioxide (CO₂) as their primary carbon source, converting it into organic molecules through processes like photosynthesis or chemosynthesis. They are capable of synthesizing all the carbon compounds they need for growth, making them independent of other organisms for carbon.
B. Heterotroph: Heterotrophs obtain carbon by consuming organic compounds produced by other organisms. They cannot fix CO₂ directly and rely on autotrophs or other heterotrophs for their carbon supply, which is why they are considered consumers rather than primary producers.
C. Parasite: Parasites are organisms that live on or within a host organism, deriving nutrients at the host’s expense. While many parasites are heterotrophic, being parasitic describes their lifestyle rather than their carbon source.
Correct Answer is B
Explanation
Transcription is the process by which a segment of DNA is copied into RNA by RNA polymerase. In eukaryotic cells, transcription occurs within the nucleus, where DNA is housed, allowing for the synthesis of messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA) before RNA is processed and exported to the cytoplasm for translation. In prokaryotic cells, which lack a membrane-bound nucleus, transcription occurs in the nucleoid region, where the circular DNA resides. Therefore, transcription takes place in the nucleus of eukaryotes or at the nucleoid in prokaryotes.
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