Biology · Science General

Cell Biology and Structure

3,221 Questions

Cell biology focuses on the structure and function of cellular organelles. Key topics include cellular respiration, DNA inheritance, and energy production. These fundamental biology concepts are crucial for medical entrance and state service examinations.

Cell organelles functionsCellular respiration sitesDNA and ribosomesAnimal cell structurePlant cell components

Cell Biology and Structure Questions

Multiple choice

Retrograde signaling involves communication of

  1. nucleus to the chioroplast

  2. endoplasmic reticulum to the nucleus

  3. nucleus to the mitochondria

  4. chioroplast to the nucleus
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Retrograde signaling refers to the regulatory communication from organelles such as chloroplasts and mitochondria back to the nucleus to coordinate gene expression in response to cellular and environmental cues.

Multiple choice physics current electricity electric cells and batteries

Primary cells are

  1. Recyclable

  2. Use and throw

  3. Rechargable

  4. Retractable
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Primary cells are use and throw. They are not recyclable since structure is carefully packed. They are not rechargable since chemical reactions involved are not recyclable. 

Multiple choice physics current electricity electric cells and batteries

Primary cells have _____ resistance and secondary cells have ______ resistance

  1. Low , High

  2. High, Low

  3. Low , Low

  4. High , High
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Primary cells have high internal resistance while secondary cells have low internal resistance.

Multiple choice physics current electricity electric cells and batteries

The primary cell which is used in daily life is-

  1. Leclanche cell

  2. Dry cell

  3. Daniel cell

  4. Simple voltaic cell
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Commonly used cell is dry cell.

Dry-cell is essentially comprised of a metal electrode or graphite rod {elemental carbon} surrounded by a moist electrolyte paste enclosed in a metal cylinder. in most common type of dry cell battery the cathode u=is composed of a form of elemental carbon called graphite.

Multiple choice physics current electricity electric cells and batteries

Cell which cannot be charged is 

  1. Primary cell

  2. Secondary cell

  3. Electrochemical cell

  4. None of the above

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A primary cell cannot be charged whereas secondary and electrochemical cell can be recharged.charging of a cell depends upon cell reaction is either reversible or irreversible . when reaction is irreversible then cell can not be charge after one time discharge.

Multiple choice plant kingdom biology

Smallest unit in the plant cell wall is

  1. Micelle

  2. Microfibril

  3. Fibril

  4. None of these.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In plant cell wall structure, the micelle is considered the smallest unit, consisting of a bundle of cellulose chains.

Multiple choice

The alveolar membrane is _____ cells thick

  1. 0

  2. 2

  3. 5

  4. 10
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The respiratory membrane, where gas exchange occurs in the lungs, consists of the alveolar epithelium and the capillary endothelium, making it two cells thick.

Multiple choice

The term for brain cell regeneration is...

  1. Never therapy

  2. Cognitive repair

  3. Neurogenesis

  4. Nucleases adaptation
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Neurogenesis is the biological process by which new neurons are formed in the brain, occurring primarily in the hippocampus.