Tag: unit of living - cell

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Questions Related to unit of living - cell

Multiple choice bio-chemistry unit of living - cell eukaryotic cell kinds of cell introduction to eukaryotic cell

Read the given statements regarding a cell organelle.

(i) It contains water, sap, excretory product and other unwanted materials.
(ii) It is bounded by a single membrane called tonoplast.
(iii) In plant cells, it can occupy upto $90$% of cellular volume.
(iv) Its contents form cell sap.
(v) It maintains turgor pressure.
The above features are attributed to

  1. Lysosome

  2. Vacuole

  3. Peroxisome

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

Sap vacuoles are fluid filled vacuoles or vesicles which are separated from the cytoplasm by a selectively permeable membrane called tonoplast. A number of small sap vacuoles occur in animal cells and young plant cells. In mature plant cells, small vacuoles fuse to form a single large central vacuole. The fluid present in the sap vacuoles is often called cell sap or vacuolar sap. It contains minerals, sugars, oxygen, carbon dioxide, soluble pigments and organic acids. The pigments include anthocyanins (red, purple, blue) and anthoxanthins (ivory to deep yellow). So, the correct answer is 'Vacuole'.

Multiple choice bio-chemistry unit of living - cell eukaryotic cell kinds of cell introduction to eukaryotic cell

Centrioles arise from

  1. Pre-existing centrioles

  2. De novo

  3. Nuclear envelope

  4. Sphaerosome
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Cytoplasm of eukaryotic animal cells contains two cylindrical, rod-shaped, microtubular structures, called centrioles, near the nucleus. Centrioles lack limiting membrane and DNA or RNA and form a spindle of microtubules. Though centrioles have not been found to contain DNA, yet they are capable of forming new centrioles with the help of pericentriolar satellites which function as nucleating centers.
So, the correct answer is 'Pre-existing centrioles'
Multiple choice bio-chemistry unit of living - cell eukaryotic cell kinds of cell introduction to eukaryotic cell

The control of gene expression is more complex in eukaryotic cells because the ___________________.

  1. Gene expression differentiaties specialized cells

  2. The chromosomes are linear and more numerous

  3. Operons are controlled by more than one promoter region

  4. inhibitory or activating molecules may not help to regulate transcription
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Eukaryotic gene expression is more complex because it must generate and maintain differentiated cell types (neurons vs. muscle vs. skin), each with specialized gene expression profiles. Option A correctly states this. The other options describe structural features, not regulatory complexity.

Multiple choice bio-chemistry unit of living - cell eukaryotic cell kinds of cell introduction to eukaryotic cell

Without a cytoskeleton, eukaryotic cells would not:

  1. Synthesize protein

  2. Have an efficient way to transport materials from one organelle to another

  3. Have an efficient means of metabolism

  4. Communicate with adjacent cells
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
In eukaryotic cells, the cytoskeleton is a framework around the cell that is responsible for the maintenance of its shape and size. The cytoskeleton is also involved in the transport of materials in and out of the cell. It also helps in movement. So, in the absence of a cytoskeleton, a eukaryotic cell would not be able to efficiently transport materials in and out of the cell or between two or more organelles.

So, the correct answer is 'have an efficient way to transport materials from one organelle to another'.
Multiple choice bio-chemistry unit of living - cell eukaryotic cell kinds of cell introduction to eukaryotic cell
Plant cells differ from animal cells in having

  1. Cell wall

  2. Plastids

  3. A large central vacuole

  4. All of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A plant cell has rigid wall on the outside. It has plastids like chloroplasts, leukoplasts and chromoplasts and centrally located large vacuole. All of these are absent in an animal cell.

So, the correct answer is 'All of these'

Multiple choice bio-chemistry unit of living - cell eukaryotic cell kinds of cell introduction to eukaryotic cell

Which one of these is not a eukaryote?

  1. Euglena

  2. Anabaena

  3. Spirogyra

  4. Agaricus
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Eukaryotes are organisms whose cells have a nucleus enclosed within membranes, unlike prokaryotes, which have no membrane-bound organelles.
Anabaena is a genus of filamentous cyanobacteria that exist as plankton. They are known for nitrogen-fixing abilities and are prokaryotes.
Euglena is a genus of single-cell flagellate eukaryotes.
Spirogyra is a filamentous chlorophyte green algae, which is also a eukaryote.
Agaricus is a genus of mushrooms containing both edible and poisonous species, and are eukaryotes.
So the correct option is B.
Multiple choice bio-chemistry unit of living - cell eukaryotic cell kinds of cell introduction to eukaryotic cell

Which of the following features is common to prokaryotes and many eukaryotes?

  1. Cell wall present

  2. Nuclear membrane present

  3. Membrane-bound subcellular organelles present

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

Prokaryotes and many eukaryotes contain a structure outside the cell membrane called the cell wall. With only a few exceptions all prokaryotes have thick, rigid cell walls that give them their shape. Among eukaryotes, some protists and all fungi and plants have cell wall.

Nuclear membrane, and membrane bound organelles are present only in eukaryotes.
So, the correct answer is 'Cell wall present'.

Multiple choice bio-chemistry unit of living - cell eukaryotic cell kinds of cell introduction to eukaryotic cell

Choose the correct answers from the alternatives given .
Which of the following pairs of occurrence and date is not correct?

  1. Origin of multicellular organisms650 million years ago

  2. Origin of eukaryotic cells1.5 billion years ago

  3. Origin of prokaryotic cells1.5 billion years ago

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

The prokaryotic cells lack the nucleus and were the first and simplest life forms and were originated 3.8 billion years ago. But the eukaryotic cells originated 1.5 billion years ago were complex than prokaryotes as they contained the nucleus and the most complex forms called multicellular organisms originated about 600 million years ago. So, the correct option is "origin of eukaryotic cells 1.5 billion years ago".

Multiple choice bio-chemistry unit of living - cell eukaryotic cell kinds of cell introduction to eukaryotic cell

Which of the following represents the correct sequence of relative sizes in descending order?

  1. Cell, nucleus, chromosome, water molecule, oxygen atom

  2. Cell, nucleus, water molecule, oxygen atom, chromosome

  3. Chromosome, cell, nucleus, water molecule, oxygen atom

  4. Cell, nucleus, water molecule, chromosome, oxygen atom
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Cells are the largest units listed, followed by the nucleus within the cell, then chromosomes within the nucleus, followed by molecules, and finally atoms.

Multiple choice bio-chemistry unit of living - cell eukaryotic cell kinds of cell introduction to eukaryotic cell

Consider the following statements regarding characters of Archaebacteria that they share with eukaryotes:
I. The cell wall does not contain peptidoglycan.
II. DNA associated with histones.
III. Translation initiated with formylated methionine.
IV. RNA polymerase similar to eukaryotic RNA polymerase II
V. ATPase similarity
VI. Similar DNA replication and repair
How many of the above characters Archaebacteria share with eukaryotes?

  1. 3

  2. 4

  3. 5

  4. 6
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Following characteristics of Archaebacteria that they share with eukaryotes:

The cell wall does not contain peptidoglycan, DNA associated with histones, ATPase similarity.
So the correct option is '3.'