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Chapter 7: Problem 4

. An obligate halophile requires high a. \(\mathrm{pH}\) c. salt b. temperature d. pressure

Short Answer

Expert verified
c. salt

Step by step solution

01

- Understanding the Term 'Obligate Halophile'

An obligate halophile is a microorganism that requires high salt concentrations for growth and survival. The term 'halophile' itself is derived from the Greek words 'halo' meaning salt and 'philos' meaning loving.
02

- Analyzing the Options

Consider the provided options: a) High \( \text{pH} \), b) High temperature, c) High salt, d) High pressure. Recall the definition of an obligate halophile from Step 1.
03

- Matching Definition to Option

Based on the definition of an obligate halophile, the correct requirement for these organisms is high salt concentration. Therefore, the correct option is c) salt.

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Key Concepts

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

microorganism growth
Microorganism growth refers to the increase in the number of cells of microbial life forms. This process is influenced by multiple factors such as temperature, pH, and nutrient availability. Growth occurs in phases:

  • Lag phase: Cells adapt to their environment.
  • Log phase: Exponential growth occurs.
  • Stationary phase: Nutrient depletion slows growth.
  • Death phase: Cells die faster than they reproduce.
Obligate halophiles experience their growth phases in environments with high salt concentrations. Their unique adaptation allows them to thrive where most microorganisms cannot.

salt concentration
Salt concentration is crucial for obligate halophiles. These microorganisms require environments with significant amounts of salt, often between 15-30% NaCl. Salt impacts cell function by altering osmotic pressure. Cells adjust by synthesizing organic molecules called compatible solutes to balance internal and external osmotic pressures. In environments with insufficient salt concentration, obligate halophiles cannot maintain their cellular processes and thus fail to grow. Understanding the right salt concentration is essential in microbiological research and applications.

halophiles
Halophiles are organisms that thrive in high-salinity environments. There are three types:

  • Slight halophiles: Prefer mild salt concentrations (0.3-0.8%).
  • Moderate halophiles: Prefer intermediate salt levels (3-15%).
  • Obligate halophiles: Require extremely high salt concentrations (15-30%).
These organisms are found in places such as salt lakes, saline soils, and oceans. They have unique adaptations, including specialized enzymes and cellular mechanisms, which allow them to function effectively in salty environments. Studying halophiles helps us understand extremophiles and their potential biotechnological applications, such as in environmental cleanup and the production of salt-tolerant crops.

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