Solve this multiple-choice question and choose the correct option.

Cell biology — prokaryotes: Prokaryotic cells lack which structural feature found in eukaryotes? Answer with the defining feature absent in prokaryotes. Choose the correct feature.

Difficulty: Easy

A true nucleus with a nuclear membrane
Ribosomes for protein synthesis
Plasma (cell) membrane
DNA as genetic material

Correct Answer: A true nucleus with a nuclear membrane

Explanation:

Concept / ApproachProkaryotes lack a membrane-bound nucleus and other membrane-bound organelles. Their DNA resides in a nucleoid region without a nuclear envelope.

Why others are incorrectProkaryotes do have ribosomes (70S), a plasma membrane, and DNA.

Final AnswerLack of a true nucleus (nuclear membrane) is the defining absence.

← Previous Question Next Question→

More Questions from Biology

Plant hormones: Name the organic substances that control plant growth and development in very small amounts. Full question: Organic substances which, even in very small concentrations, regulate growth and development in plants are called what? Choose the correct option.
Plant anatomy: Identify the group in which phloem tissue occurs. Full question: Phloem is a conducting tissue found in which type of organism? Choose the correct option.
Human nutrition: Identify the vitamin deficiency that causes night blindness. Full question: Night blindness (poor vision in dim light) is caused by a deficiency of which vitamin? Choose the correct option.
Plant nitrogen assimilation: Identify what plants convert absorbed soil nitrates into. Full question: Plants absorb dissolved nitrates (NO₃⁻) from the soil and convert them into which biomolecules? Choose the correct option.
Plant pigments: Identify the pigment responsible for most red, blue, and purple colours in plants. Full question: Most of the red, blue, and purple colours of flowers/fruits are due to which pigment group? Choose the correct option.
Tropisms: Name the curvature movement that causes plants to bend toward a light source. Full question: Plant bending toward the source of light occurs due to which directional growth response (movement of curvature)? Choose the correct option.
Medical entomology: Other than malaria, anopheles mosquitoes also transmit which disease as vectors? Full question: Besides spreading malaria, Anopheles mosquitoes are vectors of which additional disease? Choose the correct option.
Plant water uptake: Identify the structures through which plants absorb most of the water they need. Full question: Plants absorb the major part of their water requirement primarily through which root structures? Choose the correct option.
Nitrogen cycle check: Identify the false statement about nitrogen fixation and related processes in ecosystems. Full question: Nitrogen is fixed in ecosystems in the following ways. Which statement below is false? Choose the correct option.
Monocot vs. dicot roots: Identify the feature that distinguishes monocot roots from dicot roots. Full question: Monocot root differs from dicot root in having which of the following anatomical features? Choose the correct option.

Discussion & Comments

No comments yet. Be the first to comment!

Join Discussion