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 zoology locomotion and reproduction flagella other cell components single membrane bound organelles

Filaments present in flagella/cilia are

  1. Microfibrils

  2. Microtubules

  3. Microfilaments

  4. Microvilli
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • Cilia and flagella are small hair-like projections from the cell and are composed of microtubules which are arranged with their positive end at the outer tip of the axoneme.
  • A microtubule is a tubular linear polymer of tubulin protein which is a part of the cytoskeleton that helps to provide structure and shape to the cytoplasm of a eukaryotic cell.
  • So, the correct answer is 'Microtubules'.
Multiple choice zoology locomotion and reproduction flagella other cell components single membrane bound organelles

Which of the following statement regarding cilia is not correct?

  1. Cilia contain an outer ring of nine doublet microtubles surrounding two single microtubles.

  2. Cilia is an organelle found in prokaryotes.

  3. Cilia are short, hair-like cellular appendages.

  4. Microtubules of cilia are composed of tubulin.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Cilia are short, hair like appendages extending from the surface a living cell. Cilia are found exclusively in the prokaryotes.

Multiple choice biology transport in plant transport in the phloem of plants vascular tissue permanent tissue

Which of the following statement is true?

  1. Vessels are multicellular with wide lumen.

  2. Tracheids are multicellular with narrow lumen.

  3. Vessels are unicellular with narrow lumen.

  4. Trachieds are unicellular with wide lumen.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Vessels are multicellular with wide lumen. They are made up of vessel  elements lying one above the other. The wall of vessels is hard but not thick having wide lumen. Whereas tracheids are unicellular with narrow lumen. 

Thus, the correct answer is 'Vessels are multicellular with wide lumen'.

Multiple choice botany internal structure of root, stem and leaf internal structure of monocot leaf internal structure of dicot leaf internal structure of leaf (dicot and monocot)

Largest number of chloroplasts are found in

  1. Palisade tissue

  2. Spongy tissue

  3. Transfusion tissue

  4. Bundle sheath cell
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Palisade cells contain the largest number of chloroplasts per cell, which makes them the primary site of photosynthesis in the leaves of those plants that contain them, converting the energy in light to the chemical energy of carbohydrates. Beneath the palisade mesophyll are the spongy mesophyll cells, which also perform photosynthesis. Spongy cells acts well in high intensity light.

Multiple choice evs our body- its internal organ system leucocytes body fluids and immune responses respiratory and circulatory system

Which of the following cell/organism does not form pseudopodia during its movement/locomotion?

  1. WBC

  2. Sperm

  3. Macrophage

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

Sperm cells move primarily using a flagellum for propulsion rather than extending pseudopodia. Amoeba, macrophages, and white blood cells utilize amoeboid movement via pseudopodia. Therefore, the sperm is the correct organism that does not form pseudopodia.

Multiple choice biology living and non living keeping diseases at bay microorganism: types and habitat the world of microorganisms: part 1

Organisms that cannot be seen by naked eyes is called as

  1. Cell

  2. Microorganism

  3. Living things

  4. All of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The microorganisms are the microscopic bodies which cannot be seen directly with the naked eye. These organisms are of the size in microns. The study which deals with the microbes is known as microbiology. There are the different types of microbes like bacteria, viruses, fungi, etc.

Thus, the correct answer is option B. 

Multiple choice biology the flower structure of a bisexual flower growth and development in plants basics of leaf and flower

A nectar-secreting gland cell characteristically contains

  1. Granular cytoplasm filling the cell and a small nucleus.

  2. Granular cytoplasm living a central vacuole and a small nucleus.

  3. Granular cytoplasm filling the cell and a large conspicuous nucleus.

  4. Vacuolated cytoplasm but with a large nucleus.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Nectaries are the excretory glands (that exude their secretion and do not store it) which are characterized by presence of rich granular cytoplasm in protoplast and conspicuous nucleus.
They lack vacuoles which makes. Large vacuole with inconspicuous cytoplasm and small nucleus are characteristic features of secretory cells that store their secretions. 
Therefore, the correct answer is option C.

Multiple choice botany caskets of life the cell structure multicellular organisms number and shape of cells
Different cells have different sizes. Arrange the following cells in an ascending order of their size and select the correct option.
(i) Mycoplasma (ii) Ostrich egg (iii) Human RBCs (iv) Bacteria.
  1. $(i)\rightarrow (iv)\rightarrow (iii) \rightarrow (ii)$
  2. $(ii)\rightarrow (iii)\rightarrow (i) \rightarrow (ii)$
  3. $(ii)\rightarrow (i)\rightarrow (iii) \rightarrow (iv)$
  4. $(iii)\rightarrow (ii)\rightarrow (i) \rightarrow (iv)$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The size order is: Mycoplasma (smallest, ~0.1-0.3 micrometers) < Bacteria (~1-2 micrometers) < Human RBCs (~7-8 micrometers) < Ostrich egg (largest, macroscopic).

Multiple choice botany caskets of life the cell structure multicellular organisms number and shape of cells

Different cells have different sizes. Arrange the following cells in ascending order of their size and select the correct option:


(i) Mycoplasma                  (ii) Ostrich egg
(iii) Human RBCs              (iv) Bacteria

  1. (i) $\rightarrow$ (iv) $\rightarrow$ (iii) $\rightarrow$ (ii)
  2. (i) $\rightarrow$ (iii) $\rightarrow$ (iv) $\rightarrow$ (ii)
  3. (ii) $\rightarrow$ (i) $\rightarrow$ (iii) $\rightarrow$ (iv)
  4. (ii) $\rightarrow$ (ii) $\rightarrow$ (i) $\rightarrow$ (iv)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • The smallest cell is Mycoplasma (0.1-0.5$\mu m$). 
  • Bacterial cell measures 3-5$\mu m$ in length. 
  • Erythrocytes are 6-8$\mu m$ in diameter. 
  • The larges cell is the egg of Ostrich.
Multiple choice botany caskets of life the cell structure multicellular organisms number and shape of cells

An organism made of many cells is called a

  1. unicellular organism

  2. multicellular organism

  3. microorganism

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

An organism which is made of more than one cell is called a multi-cellular organism. Humans, animals and plants are some multi-cellular organisms which are made of millions to trillions of cells.

Multiple choice botany caskets of life the cell structure multicellular organisms number and shape of cells

Which of the following is not a cell?

  1. Red Blood Corpuscle (RBC)

  2. Bacterium

  3. Spermatozoa

  4. Virus
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A cell is defined by definitive structures of the cell membrane and cytoplasm and its capacity of performing the vital metabolic activities. The viruses do not have a defined cellular structure. They are made of a protein coat in which a genetic material (either DNA or RNA) is present. They are unable to perform their cellular activities. They are obligate parasites that depend on the machinery of the host cell to perform their multiplication as well as metabolism.

A. Red blood corpuscles are proper cells that have the nucleus at the young stage. Later, on maturity, they perform their metabolic activities through different pathways.
B. The bacterial cell is a prokaryotic cell which is capable of sustaining on its cellular machinery.
C. Spermatozoa are the haploid cells that do not have a long life but are provided with cellular machinery to carry out vital activities.
D. The virus is acellular. They need the cellular machinery of the host cell to perform the vital activities.
Hence, the correct answer is 'Virus'

Multiple choice botany caskets of life the cell structure multicellular organisms number and shape of cells

Cells regulate their activity through 

  1. Flow of energy

  2. Flow of material

  3. Flow of information

  4. Flow of smoke
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Cells in your body get energy from the foods that are eaten, such as glucose (a sugar). Cellular respiration converts glucose and oxygen into water, carbon dioxide and usable form of energy called ATP (this stands for adenosine triphosphate).

So the correct answer is 'option A'.