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Ch. 8 - An Introduction to Metabolism
Campbell - Campbell Biology 12th Edition
Urry12th EditionCampbell BiologyISBN: 9785794169850Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoUrry 12th EditionCh. 8 - An Introduction to MetabolismProblema 1
Capitolo 8, Problema 1

Choose the pair of terms that correctly completes this sentence: Catabolism is to anabolism as ____________ is to ____________.
a. exergonic; spontaneous
b. exergonic; endergonic
c. free energy; entropy
d. work; energy

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1
Understand the terms 'catabolism' and 'anabolism'. Catabolism refers to the breakdown of complex molecules into simpler ones, releasing energy. Anabolism is the process of building complex molecules from simpler ones, requiring energy input.
Recognize that catabolic reactions are typically exergonic, meaning they release energy. Anabolic reactions are endergonic, meaning they require energy input.
Consider the analogy in the sentence: 'Catabolism is to anabolism as ___ is to ___'. This suggests a comparison between two pairs of processes or concepts.
Identify the correct pair of terms that reflects the energy dynamics of catabolism and anabolism. Since catabolism is exergonic, releasing energy, and anabolism is endergonic, requiring energy, the correct pair would be 'exergonic; endergonic'.
Review the options provided: a. exergonic; spontaneous, b. exergonic; endergonic, c. free energy; entropy, d. work; energy. Option b correctly reflects the energy relationship between catabolism and anabolism.

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Catabolism

Catabolism refers to the metabolic pathways that break down molecules into smaller units, releasing energy in the process. It is typically associated with exergonic reactions, where energy is released as complex molecules are broken down into simpler ones, such as during cellular respiration.
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Catabolic & Anabolic Pathways

Anabolism

Anabolism is the set of metabolic pathways that construct molecules from smaller units, requiring energy input. These processes are endergonic, meaning they consume energy to synthesize complex molecules like proteins and nucleic acids, essential for cell growth and repair.
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Catabolic & Anabolic Pathways

Exergonic vs. Endergonic Reactions

Exergonic reactions are chemical processes that release energy, often associated with catabolic pathways. In contrast, endergonic reactions require an input of energy, characteristic of anabolic pathways. Understanding these terms helps in identifying how energy flows in biological systems, crucial for metabolism.
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Types of Chemical Reactions
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Domanda del libro di testo

Most cells cannot harness heat to perform work because

a. Heat does not involve a transfer of energy.

b. Cells do not have much thermal energy; they are relatively cool.

c. Temperature is usually uniform throughout a cell.

d. Heat can never be used to do work.

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Domanda del libro di testo

If an enzyme in solution is saturated with substrate, the most effective way to obtain a faster yield of products is to

a. Add more of the enzyme.

b. Heat the solution to 90°C.

c. Add more substrate.

d. Add a noncompetitive inhibitor.

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Domanda del libro di testo

Which of the following metabolic processes can occur without a net influx of energy from some other process?

a. ADP + Ⓟi → ATP + H2O

b. C6H12O6 + 6O2 → 6CO2 + 6H2O

c. 6CO2 + 6H2O → C6H12O6 + 6O2

d. Aminoacids →Protein

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