High concentrations of solutes, like sugar or salt, results in plasmolysis of cells. The reason for this is
high osmotic pressure
protein denaturation
DNA mutation
filtration
The Correct Answer is A
A. High osmotic pressure: A hypertonic environment (high external solute concentration) causes water to move out of the cell by osmosis, leading to shrinkage of the cell membrane away from the cell wall (plasmolysis).
B. Protein denaturation: While extreme solute conditions can affect proteins, plasmolysis is primarily driven by osmotic water loss rather than direct denaturation of proteins.
C. DNA mutation: DNA mutation is unrelated to the immediate physical shrinking of the cell that occurs during plasmolysis.
D. Filtration: Filtration is a physical separation method and does not explain why high solute concentrations cause cells to plasmolyze.
Nursing Test Bank
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Related Questions
Correct Answer is D
Explanation
A. DNA replication: DNA replication copies DNA from a DNA template and does not use RNA as the template for making DNA.
B. Transcription: Transcription is the synthesis of RNA from a DNA template, not the synthesis of DNA from RNA.
C. Translation: Translation converts mRNA codons into amino acids to build proteins; it does not produce DNA.
D. Reverse transcription: Reverse transcription uses an RNA template to synthesize complementary DNA (cDNA); retroviruses use reverse transcriptase to perform this process.
Correct Answer is D
Explanation
A. Parasitic: A parasitic relationship benefits the microbe at the host’s expense and typically causes harm; producing vitamin K for the host does not fit the parasitic definition.
B. Saprobic: Saprobic organisms obtain nutrients from dead or decaying organic matter (decomposers); intestinal E. coli living on host-derived substrates and contributing vitamins are not acting as saprobes.
C. Antagonistic: Antagonistic interactions involve one organism inhibiting another (competition or antimicrobial production); the described vitamin-producing relationship does not reflect antagonism.
D. Mutualistic: Mutualism describes a relationship where both partners benefit — E. coli gains a habitat and nutrients while the host gains vitamin K — which fits this scenario.
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