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Chapter 4: Problem 4

The sum of all chemical processes through which cells obtain and store energy is called

Short Answer

Expert verified
The sum of all these processes is called Metabolism.

Step by step solution

01

Identify key terms

Identify and understand the key terms in the problem. In this case, the key terms are 'sum of all chemical processes', 'cells', and 'obtain and store energy'. This refers to the biological processes that support life.
02

Connect with biological concepts

The processes that help cells obtain and store energy include all the chemical reactions occurring in an organism. These generally include processes like catabolism and anabolism which together are known as a larger concept.
03

Define Metabolism

Discover that the term describing the entire range of biochemical processes is known as 'Metabolism'. It encompasses both the breakdown of nutrients to generate energy and the use of energy to construct cellular components.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Catabolism
Catabolism is one of the fundamental processes in metabolism. It involves breaking down molecules into smaller units. This process generates energy that is essential for cells to function. Think of catabolism as a metabolic pathway that breaks down complex molecules like carbohydrates, fats, and proteins.

There are several key processes within catabolism:
  • Breaking down glucose during glycolysis, leading to the production of ATP, pyruvate, and NADH.
  • Converting fat into fatty acids and glycerol, which is then processed to release energy.
  • Breaking down proteins into amino acids which can then be used to produce energy.
The energy released during catabolism is stored in the form of adenosine triphosphate (ATP), which acts as a primary energy currency in cells.
Anabolism
Anabolism is the counterpart to catabolism. It involves the synthesis of complex molecules from simpler ones and consumes energy. You can think of anabolism as the process of building up the body's storage and structural components.

Key anabolic processes include:
  • Synthesizing proteins from amino acids, necessary for repairing tissues and building muscle.
  • Producing glycogen from glucose molecules, which serves as an energy reserve.
  • Forming lipids from fatty acids, crucial for cellular membranes and energy storage.
Anabolic reactions take place when the body has available energy, often in the form of ATP, to construct essential components that cells need.
Cellular Energy
Cellular energy is the power that drives every cell process. It is primarily derived from the conversion of adenosine triphosphate (ATP) produced during catabolic processes. Cells utilize ATP to perform work, such as muscle contraction, nerve impulse propagation, and chemical synthesis.

How do cells generate and utilize energy?
  • Energy is liberated when ATP is converted to adenosine diphosphate (ADP) and an inorganic phosphate, releasing stored energy for cellular work.
  • This energy transfer is what allows cells to grow, divide, and react to their environment.
  • Photosynthesis in plants and cellular respiration in animals are processes that replenish ATP supplies.
Therefore, cellular energy keeps biological systems functioning and allows organisms to sustain life.

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Most popular questions from this chapter

Create maps using the following terms. Map 1: Metabolism \(\begin{array}{ll}\text { - acetyl CoA } & \text { - glycolysis } \\ \text { - ATP } & \text { - high-energy electrons } \\ \text { - citric acid cycle } & \text { - lactate } \\ \text { - } \mathrm{CO}_{2} & \cdot \text { mitochondria } \\ \text { - cytosol } & \cdot \text { NADH } \\ \text { - clectron transport system } & \text { - oxygen } \\ \text { - FADH } & \text { * pyruvate } \\ \text { - glucose } & \text { * water }\end{array}\)

In an oxidation-reduction reaction, in which electrons are moved between molecules, the molecule that gains an electron is said to be and the one that loses an electron is said to be

If the protein-coding portion of a piece of processed mRNA is 450 bases long, how many amino acids will be in the corresponding polypeptide? (Hint: The start codon is translated into an amino acid, but the stop codon is not.)

Briefly describe the processes of transcription and translation. Which organelles are involved in each process?

Compare the following: (a) the energy yield from the aerobic breakdown of one glucose to \(\mathrm{CO}_{2}\) and \(\mathrm{H}_{2} \mathrm{O}\), and (b) the energy yield from one glucose going through anaerobic glycolysis ending with lactate. What are the advantages of each pathway?
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