Tag: biology

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Multiple choice mitosis structure of chromosome, cell cycle and cell division cell division biology cell division in embryo development division for growth and reproduction

Number of cells daily replaced in human body is

  1. $1 \times 10^9$
  2. $5 \times 10^9$
  3. $1 \times 10^{10}$
  4. $5 \times 10^{10}$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The human body replaces approximately 1 billion (1 x 10^9) cells daily, primarily through processes like cell turnover in the skin and gut lining.

Multiple choice mitosis structure of chromosome, cell cycle and cell division cell division biology cell division in embryo development division for growth and reproduction

Heparin is formed by.

  1. Liver cells

  2. Plasma cells

  3. Blood cells

  4. Spleen cells
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Heparin is a naturally occuring anticoagulant which is synthesised in Liver as well as blood cells such as basophils and mast cells. Heparin prevents the formation of blood clots and extension of existing blood clots within the blood.
So, the correct answer is 'Both A and C'.
Multiple choice mitosis structure of chromosome, cell cycle and cell division cell division biology cell division in embryo development division for growth and reproduction

Fat absorbed from gut is transported in blood as

  1. Micelles

  2. Liposomes

  3. Chemomicrons

  4. Chylomicrons

  5. Phagocytes
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
The products of lipid digestion enter the body by a different process and a different route. These products namely, long chain fatty acids, monoglycerides and diglycerides are insoluble in water and cannot be directly absorbed from intestinal contents. They combine with the bile salts and phospholipids to form small spherical water-soluble molecular aggregates called micelles. From the micelles, fatty acids, glycerides and fat-soluble vitamins are actively absorbed into the intestinal cells. In these cells, the bile salts are freed and fatty acids, glycerol, monoglycerides and diglycerides are resynthesized into fats. The fats are then mixed with cholesterol and coated with special proteins forming small globules called chylomicrons The latter are transported by exocytosis out of the epithelial cells into a lacteal.
Thus, the correct answer is option D. 
Multiple choice mitosis structure of chromosome, cell cycle and cell division cell division biology cell division in embryo development division for growth and reproduction

Basement membrane is formed of.

  1. Epidermal cells

  2. Endodermal cells

  3. Both A and B

  4. None of the above but present below epithelial cells
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

All epithelia are separated from their underlying tissues by an extracellular basement membrane which is fibrous in nature. The basement membrane is the fusion of two lamina namely, the basal lamina and the reticular lamina. The lamina reticularis is attached to the basal lamina with collagen anchoring fibrils and fibrillin microfibrils. The two layers together are collectively referred to as the basement membrane.

So D is the correct option. 

Multiple choice mitosis structure of chromosome, cell cycle and cell division cell division biology cell division in embryo development division for growth and reproduction

Angiotensinogen is a protein secreted by

  1. Juxtaglomerular cells

  2. Macula densa cells

  3. Endothelial cells

  4. Liver cells
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Angiotensinogen is a plasma protein produced and secreted by liver cells. It is a sole precursor of all angiotensin peptide. Juxtaglomerular cells secrete renin which acts on angiotensinogen to release angiotensin I and then it is converted to angiotensin II by the action of enzyme angiotensin-converting enzymes.
So, the correct answer is 'Liver cells'.
Multiple choice mitosis structure of chromosome, cell cycle and cell division cell division biology cell division in embryo development division for growth and reproduction

Division of the nucleus is called ..........

  1. Cytokinesis

  2. Karyokinesis

  3. Replication

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

Division of the nucleus is called karyokinesis. The process of partition of a cell's nucleus into the daughter cells during cell division is called karyokinesis. All the changes in a nucleus that occur during cell division are collectively termed as karyokinesis. It has four stages prophase, metaphase, anaphase, and telophase.

So the correct answer is "Karyokinesis".

Multiple choice mitosis structure of chromosome, cell cycle and cell division cell division biology cell division in embryo development division for growth and reproduction

All nuclear changes that occur during mitotic cell division are collectively called as

  1. Karyokinesis

  2. Cytokinesis

  3. Recombination

  4. Both A and B
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

All nuclear changes (Prophase, metaphase, anaphase, and telophase) that occurs during mitotic cell division are collectively called as karyokinesis. Mitotic cell division consists of two steps. The first step is karyokinesis where nuclear division takes place which is followed by cytokinesis i.e the division of cytoplasm takes place and individual daughter cells are formed. So, the correct answer is 'Karyokinesis'.

Multiple choice mitosis structure of chromosome, cell cycle and cell division cell division biology cell division in embryo development division for growth and reproduction

The epithelial cells lining the stomach of vertebrates are protected from damage by HCl because.

  1. HCl is too dilute

  2. The epithelial cells are resistant to the action of HCl

  3. HCl is neutralized in the stomach

  4. The epithelial cells are covered by mucus
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
The epithelial cells lining the stomach of vertebrates are protected from damage by HCl because 'the epithelial cells are covered by a mucous secretion'.
So the correct option is D.
Multiple choice mitosis structure of chromosome, cell cycle and cell division cell division biology cell division in embryo development division for growth and reproduction

Epithelial cells serves the function of protection, secretion and absorption and is separated from the other tissues below by a _____.

  1. Basal lamina

  2. Lamina propria

  3. Connective tissue

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

Epithelial tissues rest on a specialized extracellular matrix called the basal lamina, which separates them from the underlying connective tissues. Other options like lamina propria are connective tissue layers rather than the immediate separating boundary.