biology general-knowledge question and answers -Page 22

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Biology problems

1. Which cells are destroyed in AIDS
Options
A. Monocytes
B. Neutrophils
C. Lymphocytes
D. R.B.C.

Discuss

Correct Answer: Lymphocytes

2. The protoplasm of a child is exactly the same as that of its
Options
A. mother
B. father
C. grandfather
D. identical twin

Discuss

Correct Answer: identical twin

Explanation:

Though all living organisms are made of protoplasm each individual has a different composition however slight it be. In identical twins the same cell divides into two and each one develops into one person. So the genitic make-up and type of protoplasm are exactly the same.

3. Enzymes are produced by
Options
A. endocrine glands
B. exocrine glands
C. liver
D. spleen

Discuss

Correct Answer: exocrine glands

Explanation:

Glands are of two types. The exocrine glands have ducts to carry their secretions and these secretions contain enzymes. on the other hand, endocrine glands are ductless glands and they secrete mainly horomones.

4. Branch of biology in which we study about relationship between living and their environment
Options
A. Physiology
B. Genetics
C. Ecology
D. Geology

Discuss

Correct Answer: Ecology

5. In a bisexual flower if androcium and gynoecium mature at different time the phenomeon is known as _________
Options
A. Dichogamy
B. Herpogamy
C. Haterogamy monogamy
D. None of these

Discuss

Correct Answer: Dichogamy

6. Which organelles in the cell, other than nucleus contains DNA?
Options
A. Centriole
B. Goalgi apparatus
C. Lysosomes
D. Mitochondria

Discuss

Correct Answer: Mitochondria

7. Water pollution of a river is measured by_______
Options
A. Amount of chlorine dissolve in water
B. Amount of Ozone dissolve in water
C. Amount of nitrogen dissolve in water
D. Amount of oxygen dissolve in water

Discuss

Correct Answer: Amount of oxygen dissolve in water

8. Why is Meiosis called Reduction Division?

Also asked in:

Analyst

Bank PO

Discuss

Correct Answer: Meiosis :: Meiosis is a type of cell division that reduces the chromosome number by half in daughter cells, creating four haploid cells, each genetically distinct from the parent cell that gave rise to them Why it is called as Reduction Division :: 1 As the Meiosis division process involves in reduction of chromosome number in the daughter cells to half the number in the parent cell, this process is called Reduction Division Meiosis creates gametes (egg and sperm cells) 2 The resulting gametes have 23 new chromosomes, one member of each of the 23 pairs, representing unique combinations of the original maternal and paternal copies

9. Chylomicrons are synthesized within the
Options
A. Intestinal cells
B. Liver
C. Storage compartment of plant seeds
D. Lymphatic system

Also asked in:

Correct Answer: Lymphatic system

Explanation:

Lipoproteins are particles that contain triacylglycerol (TAG), cholesterol, phospholipids and amphipathic proteins called apolipoproteins.

The four major types of lipoproteins are

1. chylomicrons,

2. very low-density lipoprotein (VLDL),

3. low-density lipoprotein (LDL), and

4. high-density lipoprotein (HDL).

Chylomicrons are formed in the endoplasmic reticulum in the absorptive cells (enterocytes) of the small intestine.

The function of these lipoproteins is to deliver energy-rich triacylglycerol (TAG) to cells in the body (pink pathway). TAG is stripped from chylomicrons and VLDL through the action of lipoprotein lipase, an enzyme that is found on the surface of endothelial cells. This enzyme digests the TAG to fatty acids and monoglycerides, which can then diffuse into the cell to be oxidized, or in the case of an adipose cell, to be re-synthesized into TAG and stored in the cell.