Diversity of living organisms prokaryotes

Prokaryotes

Quiz Type

Practice

Subject

Biology

Level

Level 100

Questions

10 questions

Created By

Solomon Ackon

Quick Rules

Time limit: 10 minutes
Multiple attempts are not allowed
All questions must be answered to submit

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Question 1 of 10

Question 1

True false Understanding

Prokaryotes are organisms that lack a defined nucleus.

True

Correct

False

Explanation

This statement is true because prokaryotes, such as bacteria and archaea, do not have a membrane-bound nucleus. Instead, their genetic material is typically found in a single circular chromosome located in a region called the nucleoid.

Question 2

True false Understanding

All prokaryotes are multicellular organisms.

True

False

Correct

Explanation

This statement is false because prokaryotes are primarily unicellular organisms. While some prokaryotes can form colonies or multicellular structures, they do not fit the criteria of multicellularity as seen in eukaryotic organisms.

Question 3

True false Understanding

Prokaryotes reproduce asexually through a process called binary fission.

True

Correct

False

Explanation

This statement is true because binary fission is the primary method of reproduction for prokaryotes, where a single cell divides into two identical daughter cells. This process allows for rapid population growth under favorable conditions.

Question 4

Assertion reason Analyzing

Assertion (A): Prokaryotes are unicellular organisms that lack a nucleus. Reason (R): The absence of a nucleus in prokaryotes allows them to replicate quickly and adapt to their environments rapidly.

Both A and R are true, and R is the correct explanation of A

Correct

Both A and R are true, but R is NOT the explanation of A

A is true but R is false

A is false but R is true

Explanation

The assertion is true as prokaryotes are indeed unicellular and lack a nucleus. The reason given explains how this characteristic contributes to their rapid reproduction and adaptability, thus it is a correct explanation of A.

Question 5

Basic multiple choice Remembering

What are prokaryotes?

Single-celled organisms without a nucleus

Correct

Multicellular organisms with a nucleus

Organisms that always require oxygen

Organisms that are larger than eukaryotes

Explanation

Prokaryotes are defined as single-celled organisms that lack a nucleus, distinguishing them from eukaryotes, which have a nucleus and can be multicellular.

Question 6

Basic multiple choice Understanding

Which of the following statements is true about prokaryotes?

They are always harmful to humans

They can be found in various environments

Correct

They reproduce only sexually

They have complex cellular structures

Explanation

Prokaryotes are versatile organisms that can exist in diverse environments, including extreme conditions, and can reproduce asexually.

Question 7

Basic multiple choice Understanding

What feature distinguishes prokaryotes from eukaryotes?

Presence of a nuclear membrane

Absence of membrane-bound organelles

Correct

Size of the organism

Mode of nutrition

Explanation

The key distinguishing feature of prokaryotes is the absence of membrane-bound organelles, including a nuclear membrane, whereas eukaryotes possess these structures.

Question 8

Basic multiple choice Remembering

Which of the following best describes the genetic material of prokaryotes?

Linear DNA enclosed in a nucleus

Circular DNA located in the cytoplasm

Correct

DNA organized into chromosomes

No DNA present

Explanation

Prokaryotes typically possess circular DNA that is found free in the cytoplasm, not enclosed within a nucleus like in eukaryotes.

Question 9

Complex multiple choice Understanding

A researcher is studying a sample of bacteria under a microscope and notices that they do not have a nucleus. Based on this observation, what conclusion can the researcher draw about the type of organisms they are studying?

The organisms are likely eukaryotes because they lack membrane-bound organelles.

The organisms are prokaryotes because they lack a nucleus.

Correct

The organisms must be viruses as they do not have a defined cellular structure.

The organisms are complex multicellular organisms that just appear smaller than they are.

Explanation

The correct analysis is that the organisms are prokaryotes because they lack a nucleus, which is a defining feature of prokaryotic cells. The distractors are common misconceptions: eukaryotes do have a nucleus and membrane-bound organelles, viruses are not cells and cannot be classified as prokaryotes or eukaryotes, and the assumption that they are complex organisms misinterprets the defining characteristics of cellular life.

Question 10

Complex multiple choice Understanding

A team of scientists is attempting to genetically modify a bacterium to produce insulin. They need to ensure they are working with a prokaryotic organism. Which of the following characteristics should the scientists use to confirm they are using the correct type of organism?

The presence of a cell wall composed primarily of peptidoglycan.

Correct

The presence of multiple chromosomes organized within a membrane-bound nucleus.

The ability to undergo mitosis for cell division.

The presence of membrane-bound organelles such as mitochondria.

Explanation

The correct analysis is that the presence of a cell wall made of peptidoglycan is characteristic of prokaryotes, specifically bacteria. The other options are incorrect: eukaryotic cells have membranes around their nuclei, undergo mitosis and have organelles like mitochondria, which are not found in prokaryotic cells.