Tag: cell and cell organelles

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Questions Related to cell and cell organelles

Multiple choice biology cell and cell organelles cell membrane and cell wall cell wall cell division in embryo development component of the cell cell organelles cell: the unit of life cell as structural and functional unit basics of cell

Match the following.

Column I Column II
A. Bacteria 1. Synthesis and storage of lipids
B. Sphaerosomes   2. Idiogram
C. Chloroplasts 3. Glycocalyx
D. Karyotype 4. Thylakoids

  1. A-3, B-2, C-4, D-1

  2. A-3, B-1, C-2, D-4

  3. A-4, B-3, C-2, D-1

  4. A-1, B-2, C-3, D-4

  5. A-3, B-1, C-4, D-2
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Sphaerosomes are single half unit membrane covered small spherical organelles which synthesize and store fats. The cell wall of bacteria is made up of glycocalyx (carbohydrate and amino acids). Chloroplasts are eukaryotic plant cell organelles which have an internal thylakoid membrane system. The thylakoid membranes carry out the light reactions part of photosynthesis. The chromosomes of a eukaryotic cells are called its karyotype. The diagrammatic representation of a cells karyotype is called an idiogram.

Multiple choice biology cell and cell organelles cell membrane and cell wall cell wall cell division in embryo development

During breakdown of lecithin which of the following is not obtained?

  1. Trihydroxy propane

  2. Fatty acid

  3. Choline

  4. Sphingosine
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • Lecithin is also known as phosphatidylcholine (a group of phospholipids) which are important for maintaining the cell structure and metabolism.
  • Lecithins are composed of phosphoric acid, choline, esters of glycerol and two fatty acids. 
  • Thus, during the breakdown of lecithin fatty acid, choline and sphingosine are obtained.
  • So the correct answer is 'Trihydroxy propane'.
Multiple choice biology cell and cell organelles cell membrane and cell wall cell wall cell division in embryo development

Organelles that are surrounded by two membranes are-

  1. Nucleus and mitochondria.

  2. Nucleus and Golgi bodies.

  3. Endoplasmic reticulum and Lysosomes.

  4. Endoplasmic reticulum and Mitochondria.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Mitochondria and the nucleus are both organelles enclosed by a double membrane system. Golgi bodies and endoplasmic reticulum are single-membrane bound.

Multiple choice biology cell and cell organelles cell membrane and cell wall cell wall cell division in embryo development

Consider the following and choose correct features w.r.t. bacillariophycean members. 
(a) Girdle
(b) Cnidoblast
(c) Sewage pollution indicator
(d) Zygotic meiosis
(e) Auxospores
(f) Diplontic life cycle

  1. $\text{a, d, e & f}$
  2. $\text{b, c, d & e}$
  3. $\text{c, d, e & f}$
  4. $\text{c, e & f}$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Bacillariophyceae (diatoms) are characterized by features like auxospores, zygotic meiosis, and a diplontic life cycle. Girdle refers to their frustule structure.

Multiple choice biology cell and cell organelles cell membrane and cell wall cell wall cell division in embryo development

Robert Hooke discovered the ___ of a cell

  1. cell membrane

  2. Nucleus

  3. Cell wall

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

Cell wall was discovered by Robert Hooke, in 1665, when he saw an empty box like compartments in a very thin slice of cork under his microscope. He wrote a book Micrographia and coined the term Cellula which was later on changed into cells. Robert Hooke thought cells to be passages for conducting fluids. Actually, he had observed compartments made up of the cell wall and not true living cells.

Multiple choice biology cell and cell organelles cell membrane and cell wall cell wall cell division in embryo development

The cell membrane is selectively permeable, it can be best deduced by?

  1. The entry of water

  2. The entry of selective mineral salts

  3. Both A and B

  4. The rise of sap in plants
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
A selectively permeable membrane will allow free passage of solvent or water molecules, however, the entry of solute particles will be selectively allowed. In other words, not all but selected solute particles will be allowed to pass through.
Multiple choice biology cell and cell organelles cell membrane and cell wall cell wall cell division in embryo development

Which one of the following is wrong statement.

  1. Anabaena and Nostoc are capable of fixing nitrogen- in

    free living state also

  2. Root nodule forming nitrogen fixers live as aerobes

  3. Phosphours is a constituent of all members ,certain

    nucleic acids and all proteins

  4. Nitrosomonas and Nitrobacter are chemoautotrophs
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Anabaena and Nostoc are also free-living nitrogen fixers.
Root nodule forming nitrogen fixers enzyme (nitrogenase) works only under the anaerobic condition.
Phosphorus is a constituent of cell membranes as a phospholipid, in nucleic acid as phosphate group and proteins are rich in phosphorus.
Nitrosomonas and Nitrobacter play an important role in nitrification. They are chemoautotrophs.
So the correct answer is 'Root nodule forming nitrogen fixers live as aerobes under free-living conditions'
Multiple choice biology cell and cell organelles cell membrane and cell wall cell wall cell division in embryo development

Keeping is view the structure of cell membrane, which one of the following statements is correct with respect to the movements of liquid and proteins from one liquid monolayer to the other(flip flop movement).

  1. While proteins can flip flop, liquids can not

  2. Neither lipids, nor proteins can flip flop

  3. Both lipids and proteins can flip flop

  4. While lipids can rarely flip flop, proteins can not
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

According to the fluid mosaic model of the cell membrane, lipids can rapidly diffuse laterally and occasionally flip flop from one monolayer to the other, though this transverse movement is very rare without the help of enzymes like flippases. Integral membrane proteins, on the other hand, never undergo flip flop movement due to the thermodynamic barrier of hydrophilic regions passing through the hydrophobic core.

Multiple choice biology cell and cell organelles cell membrane and cell wall cell wall cell division in embryo development

Which of the following statement is INCORRECT regarding biological membrane?

  1. It is composed of lipids and proteins

  2. Peripheral proteins are loosely associated with the membrane

  3. Integral proteins span the lipid bilayer

  4. Lipids and membrane proteins do not provide structural and functional asymmetry
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Biological membranes are highly asymmetric in both lipid composition and protein distribution, which is essential for their functional diversity.