The amount of energy required to initiate every metabolic reaction is called
activation energy.
enzyme energy.
cumulative energy.
work energy.
The Correct Answer is A
A. activation energy: Activation energy is the minimum amount of energy required to initiate a chemical or metabolic reaction. Enzymes lower this energy threshold, allowing reactions to occur more rapidly and efficiently at physiological temperatures, which is essential for sustaining life processes.
B. enzyme energy: There is no specific concept called "enzyme energy." Enzymes function by reducing activation energy, but they do not provide energy themselves; they act as catalysts to facilitate reactions.
C. cumulative energy: Cumulative energy is not a recognized term in biochemistry or metabolic reactions. Energy in metabolism is measured in terms of activation energy, free energy changes (ΔG), or ATP yield, not cumulative energy.
D. work energy: Work energy is a general physical concept referring to energy required to perform work but is not specific to initiating metabolic reactions. In biology, the energy to start reactions is specifically referred to as activation energy.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Resistant survival structures: Bacillus spores, also called endospores, are highly durable, dormant structures formed in response to harsh environmental conditions. They have a thick protective coat, dehydrated core, and DNA-stabilizing proteins, which allow them to survive extreme heat, desiccation, radiation, and chemical disinfectants. Their primary function is survival, not growth or reproduction.
B. Reproductive cells: Spores in Bacillus are not reproductive; they do not produce new bacteria directly. Reproduction in bacteria typically occurs through binary fission. Endospores are a survival mechanism to endure unfavorable conditions and germinate into vegetative cells when the environment becomes favorable.
C. Energy-producing cells: Spores are metabolically inactive and do not produce energy. Their dormant state minimizes metabolic activity, conserving energy and resources until conditions allow the spore to germinate and resume normal cellular functions.
Correct Answer is D
Explanation
A. Conjugation: Conjugation is a form of bacterial DNA recombination in which genetic material is transferred directly from one bacterial cell to another through a pilus. This process allows for the exchange of plasmids or chromosomal fragments, contributing to genetic diversity and the spread of traits like antibiotic resistance.
B. Transformation: Transformation involves the uptake of free, naked DNA from the environment by a bacterial cell. This DNA can integrate into the recipient’s genome, leading to genetic variation. Transformation is commonly observed in naturally competent bacteria such as Streptococcus pneumoniae.
C. Transduction: Transduction is the process by which bacterial DNA is transferred from one bacterium to another by a bacteriophage (virus). The phage accidentally incorporates host DNA and introduces it into a new bacterial cell, facilitating genetic recombination without direct cell-to-cell contact.
D. Induction: Induction is not a type of bacterial DNA recombination. Instead, it refers to the activation of gene expression, often in response to environmental signals, such as the induction of operons in bacteria. It does not involve the exchange or incorporation of DNA between cells and therefore does not contribute to genetic recombination.
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