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Prokaryotes

Quiz Type

Practice

Subject

Biology

Level

Level 100

Questions

10 questions

Created By

Zahara Soalihu

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 single-celled organisms that lack a defined nucleus.

True

Correct

False

Explanation

This statement is true because prokaryotes, such as bacteria and archaea, are characterized by their simple cell structure, which does not include a membrane-bound nucleus. Instead, their genetic material is found in a region called the nucleoid.

Question 2

True false Understanding

All prokaryotes are pathogenic and cause diseases in humans.

True

False

Correct

Explanation

This statement is false because while some prokaryotes are pathogenic and can cause diseases, many others are beneficial or neutral to humans. For example, some bacteria play a crucial role in digestion and nutrient cycling.

Question 3

True false Understanding

Prokaryotes are more complex than eukaryotes in terms of cellular structure.

True

False

Correct

Explanation

This statement is false because prokaryotes are simpler in structure compared to eukaryotes. Unlike prokaryotes, eukaryotic cells have a defined nucleus and various membrane-bound organelles, which contribute to their greater complexity.

Question 4

Assertion reason Analyzing

Assertion (A): Prokaryotes are unicellular organisms that lack a nucleus. Reason (R): The absence of a nucleus allows prokaryotes to have simpler cellular structures compared to eukaryotes.

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

Both statements are correct: prokaryotes indeed lack a nucleus, which contributes to their simpler cellular organization. Thus, R effectively explains the reason behind A.

Question 5

Basic multiple choice Remembering

What defines a prokaryote?

They have a nucleus.

They lack a nucleus.

Correct

They are multicellular organisms.

They have membrane-bound organelles.

Explanation

Prokaryotes are single-celled organisms that lack a nucleus and membrane-bound organelles, differentiating them from eukaryotes.

Question 6

Basic multiple choice Understanding

Which of the following best describes prokaryotic cells?

They are typically larger than eukaryotic cells.

They have a simple structure.

Correct

They always have a cell wall made of cellulose.

They are always aerobic in nature.

Explanation

Prokaryotic cells have a simpler structure than eukaryotic cells and can have a variety of metabolic processes, including anaerobic respiration.

Question 7

Basic multiple choice Remembering

Which of the following is NOT a characteristic of prokaryotes?

They reproduce asexually by binary fission.

They can have flagella for movement.

They possess a ribosome for protein synthesis.

They contain chloroplasts for photosynthesis.

Correct

Explanation

While some prokaryotes can perform photosynthesis, they do not have chloroplasts; they may contain other pigment molecules instead.

Question 8

Basic multiple choice Remembering

Which organisms are classified as prokaryotes?

Bacteria and fungi.

Archaea and bacteria.

Correct

Animals and plants.

Viruses and bacteria.

Explanation

Prokaryotes include mainly two groups of unicellular organisms: Bacteria and Archaea.

Question 9

Complex multiple choice Understanding

A microbiologist is studying a bacterial colony and observes that the cells lack a true nucleus and membrane-bound organelles. Based on this observation, which characteristic can the microbiologist definitively conclude about these organisms?

They are eukaryotes because they are single-celled.

They are prokaryotes because they lack a membrane-bound nucleus.

Correct

They are protists since they reproduce asexually.

They are fungi due to their ability to form colonies.

Explanation

The correct answer is that they are prokaryotes because they lack a membrane-bound nucleus. This is a defining characteristic of prokaryotic cells. The other options incorrectly categorize these organisms based on attributes that do not apply to their fundamental cellular structure.

Question 10

Complex multiple choice Understanding

Consider a newly discovered organism that can be classified as a prokaryote. If it possesses a thick, protective layer outside its cell membrane, which of the following functions might this layer primarily serve?

Facilitating photosynthesis within the cell.

Providing structural support and protection from environmental stresses.

Correct

Allowing for efficient cellular respiration process.

Enabling the organism to replicate its DNA more quickly.

Explanation

The correct answer involves providing structural support and protection from environmental stresses, which is a common function of the cell wall found in many prokaryotes. The other options misinterpret the role of a protective layer and mix functions that relate to cellular processes rather than structural integrity.