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Chapter 1: Problem 25

Fill in the Blank. The cells of prokaryotic organisms lack a _______.

Short Answer

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nucleus

Step by step solution

01

Understand the Term 'Prokaryotic Organisms'

Prokaryotic organisms are unicellular organisms that do not have a distinct nucleus or specialized organelles. They include bacteria and archaea.
02

Identify Key Differences

The key difference between prokaryotic and eukaryotic cells is that prokaryotic cells lack membrane-bound organelles such as the nucleus.
03

Fill in the Blank

Based on the understanding that prokaryotic cells do not have a distinct nucleus, the blank can be filled with the word 'nucleus'.

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Key Concepts

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

prokaryotic vs. eukaryotic cells
To understand the difference between prokaryotic and eukaryotic cells, it's essential to look at their structures and organization. Prokaryotic cells are the simplest form of cells and do not have a nucleus or other membrane-bound organelles. They include bacteria and archaea.

On the other hand, eukaryotic cells are generally more complex. These cells have a defined nucleus that encloses their genetic material. They also contain various membrane-bound organelles such as mitochondria, endoplasmic reticulum, and Golgi apparatus.
  • Prokaryotic cells: Simple, no nucleus, no membrane-bound organelles.
  • Eukaryotic cells: Complex, have a nucleus, have membrane-bound organelles.
Knowing these differences can help us understand their functions and roles in various organisms.
unicellular organisms
Unicellular organisms consist of a single cell that performs all the functions necessary for life. Prokaryotic organisms, like bacteria and archaea, are typically unicellular. In these organisms, a single cell carries out all the life processes such as growth, reproduction, and metabolism.

Although they are just one cell, these organisms can thrive in various environments鈥攔anging from extreme heat to extreme cold, and even in highly acidic or basic environments.
  • Unicellular: Made of one cell.
  • Prokaryotes: Often unicellular like bacteria.
membrane-bound organelles
Membrane-bound organelles are specialized structures within a cell that are enclosed by lipid membranes. These organelles carry out specific functions critical for cell survival and proper operation. Eukaryotic cells have various membrane-bound organelles, including the nucleus, mitochondria, and lysosomes.

The absence of these organelles in prokaryotic cells leads them to rely on other cell mechanisms to perform necessary functions.
  • Membrane-bound organelles: Only in eukaryotic cells.
  • Examples: Nucleus, Mitochondria.
  • No membrane-bound organelles: Prokaryotic cells.

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Most popular questions from this chapter

Which of the following foods is NOT made by fermentation? a. beer b. bread c. cheese d. orange juice

Which of the following is NOT a domain in Woese and Fox's phylogenetic tree? a. Plantae b. Bacteria c. Archaea d. Eukarya

Label the three Domains found on modern phylogenetic trees.

Which of the following is the standard resource for identifying bacteria? a. Systema Naturae b. Bergey's Manual of Determinative Bacteriology c. Woese and Fox's phylogenetic tree d. Haeckel's General Morphology of Organisms

Fill in the Blank. __________ are organisms without membrane-bound nuclei.
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