91Ó°ÊÓ

On a cellular level, why must food be broken down? a. Large molecules present in intact food pass through the digestive epithelium and enter the cell through the membrane, thereby damaging the nuclear membrane. Hence it must be broken down. b. Fats present in intact food contain very large molecules, which cannot pass through cell membranes. Fats need to be passed through the digestive epithelium to be utilized. c. Large molecules present in intact food cannot pass through cell membranes. Nutrients need to be passed through the digestive epithelium to be utilized. d. Large molecules, if not broken down, produce toxic substances that pass through the epithelium of the digestive tract and are utilized by the cells. This can be lethal to the cell.

Step by step solution

01

Understand the Problem Statement

The question asks for the reason why food must be broken down at a cellular level. Four options are given, and you need to choose the correct one by analyzing each statement.

02

Review Option a

Option a states that large molecules in intact food damage the nuclear membrane when they pass through the cell membrane. Evaluate if this scientifically makes sense.

03

Review Option b

Option b indicates that fats in intact food are too large to pass through cell membranes and must pass through the digestive epithelium to be used. Consider if this explanation is specific enough and aligns with known biological principles.

04

Review Option c

Option c explains that large molecules in intact food cannot pass through cell membranes, and nutrients need to be passed through the digestive epithelium in order to be utilized. Assess this in terms of cell membrane permeability and the purpose of digestion.

05

Review Option d

Option d suggests that large molecules produce toxic substances if not broken down, which can be lethal to cells. Examine if this aligns with the function of digestion and nutrient absorption.

06

Choose the Correct Answer

After evaluating all four options, determine which aligns correctly with the biological necessity of breaking down food at the cellular level.

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Key Concepts

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

Nutrient Absorption

Cells need energy and materials to function. They get these from nutrients in food. However, food we eat is made up of large complex molecules.
For cells to benefit from these nutrients, the food must be broken down into smaller molecules. This breakdown process is called digestion.
The small molecules can easily pass through cell membranes and get absorbed by cells.
Once inside the cell, these nutrients can be used for energy, growth, and repair.
A diet with varied nutrients ensures that different types of cells get the specific materials they need.
Without digestion, cells would not get the nutrients needed to function correctly because large molecules cannot pass through easily.

Cell Membrane Permeability

The cell membrane is a protective barrier that surrounds the cell. It controls what enters and exits the cell. This selective control is called permeability.
Cell membranes are semi-permeable, allowing only certain molecules to pass through.
Large molecules from intact food cannot pass through the cell membrane due to their size.
During digestion, food is broken down into smaller molecules like amino acids, glucose, and fatty acids.
These smaller molecules can pass through the cell membrane more easily.

• Small molecules can diffuse through the membrane
• Transport proteins help move larger molecules into the cell
• Proper membrane permeability is key to effective nutrient absorption

By breaking down food, cells ensure they receive the right-sized molecules for proper functioning.

Digestive Epithelium

The digestive tract is lined with a layer of cells known as the digestive epithelium. These cells play a crucial role in the digestion and absorption process.
The epithelium is responsible for the initial breakdown of food into its basic nutrients.

• Enzymes produced by these cells help break down large molecules
• The broken-down nutrients can then pass through the epithelium and enter the bloodstream
• From the bloodstream, nutrients are transported to different cells throughout the body

Digestive epithelium ensures that the nutrients from food are efficiently and effectively broken down and absorbed.
If the large molecules were not broken down, they could damage the cells in the digestive tract, hinder nutrient absorption, and lead to potential health risks.