Which of the following statements is true? a. Intracellular...

Name: Problem 4, Chapter 45: Biology
Uploaded: 2021-06-28T16:54:05-08:00
Duration: 1 min 19 s
Channel: Christina Sorrentino
Description: Which of the following statements is true? a. Intracellular digestion commonly occurs in vertebrates. b. Absorption of nutrients always requires active transport. c. Alimentary canals have two openings, whereas gastrovascular cavities have only one. d. Extracellular, but not intracellular, digestion requires hydrolytic enzymes.

Which of the following statements is true? a. Intracellular digestion commonly occurs in vertebrates. b. Absorption of nutrients always requires active transport. c. Alimentary canals have two openings, whereas gastrovascular cavities have only one. d. Extracellular, but not intracellular, digestion requires hydrolytic enzymes.

Which of the following statements is true?
a. Intracellular digestion commonly occurs in vertebrates.
b. Absorption of nutrients always requires active transport.
c. Alimentary canals have two openings, whereas gastrovascular
cavities have only one.
d. Extracellular, but not intracellular, digestion requires hydrolytic
enzymes.

Key Concepts

Digestive System Organization

This concept involves understanding the differences in the structural design of digestive systems among organisms. It distinguishes between complete digestive systems, which feature a continuous tube with two openings (mouth and anus), and incomplete digestive systems or gastrovascular cavities that have a single opening serving for both ingestion and egestion. Such distinctions are fundamental in comparative anatomy and evolutionary biology.

Intracellular vs Extracellular Digestion

Intracellular digestion refers to the process where cells engulf food particles and digest them within intracellular vesicles, a mechanism common in single-celled organisms and some simple multicellular organisms. In contrast, extracellular digestion occurs when organisms secrete enzymes into the digestive tract to break down food externally before absorption, as seen in more complex organisms.

Nutrient Absorption and Transport

This concept covers the various mechanisms by which digested nutrients are absorbed across the cell membrane into the body. Absorption can occur through active transport, which requires energy expenditure to move substances against a concentration gradient, or through passive diffusion and facilitated diffusion, which do not require energy input and follow the concentration gradient.

Enzymatic Hydrolysis in Digestion

Enzymatic hydrolysis is the chemical process by which large food molecules are broken down into smaller, absorbable units using hydrolytic enzymes. These enzymes can function both in extracellular digestion, where they are secreted into the lumen of the digestive tract, and in intracellular digestion, where lysosomal enzymes break down the engulfed food particles within cells. This concept is integral to understanding the biochemical processes of nutrient acquisition.

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