Tag: biology

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Multiple choice biology immunity phagocytosis cells in immune system immune system, its cells, mediators and antigens

Which of the following fights against the diseases?

  1. WBC

  2. RBC

  3. Liver

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

WBCs fight against the infections. White blood cells account for only about 1 percent of the blood but their impact is significant. White blood cells, also called leukocytes, are essential for good health and protection against illness and disease. Think of white blood cells as your immunity cells. In a sense, they are continually at war. They flow through your bloodstream to battle viruses, bacteria, and other foreign invaders that threaten your health. When your body is in distress and a particular area is under attack, white blood cells rush in to help destroy the harmful substance and prevent illness. Thus, option A is correct. 

Multiple choice biology immunity phagocytosis cells in immune system immune system, its cells, mediators and antigens

The main function of white blood cells in the body is to

  1. Carry oxygen

  2. Help in clot formation

  3. Produce more red cells

  4. Protect body against diseases
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

White blood cells or WBCs are also called leukocytes. They are the cells of the immune system that are involved in protecting the body against both infectious disease and foreign invaders. All leukocytes are produced and derived from a multipotent cell in the bone marrow known as a hematopoietic stem cell.

Therefore, the correct answer is option D.

Multiple choice biology immunity phagocytosis cells in immune system immune system, its cells, mediators and antigens

................. manufactures antibodies.

  1. RBC

  2. WBC

  3. Plasma

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

WBCs or the white blood cells are the types of blood cells that are main cells of the immune system. The immune system responds to a particular pathogen to give you active or acquired immunity. The surface of every cell is covered with molecules that give it a unique set of characteristics. These molecules are called antigens. Antigens are generally fragments of protein or carbohydrate molecules. There are millions of different antigens and each one has a unique shape that can be recognized by the white blood cells of your immune system. The white blood cells then produce antibodies to match the shape of the antigens. Thus, option B is correct.

Multiple choice properties of enzyme enzyme properties enzymes biomolecules: chemical constituents of living cells biology

If an enzyme has been given the EC code 3.2.1.7, it is likely to be involved in

  1. Digestin

  2. Redox reaction

  3. Isomerization

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

  • EC number is a numerical classification scheme is based on the chemical reactions which are catalyzed by them. 
  • A system of enzyme nomenclature is associated with a name for the corresponding enzyme. 
  • The number classification can be referred to that enzyme which is involved in digestion.
So, the correct option is 'Digestin'.

Multiple choice properties of enzyme enzyme properties enzymes biomolecules: chemical constituents of living cells biology

Division characteristic of Korpe-Kappe theory are

  1. Anticlinal

  2. T-type

  3. Periclinal

  4. Irregular
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
The corner-Kappe theory of root apex is comparable with the tunica-corpus theory of shoot apex. The body-cap concept and tunica-corpus concept both are based solely on the planes of cell division. Anticlinal division is the characteristic of tunica whereas corpus exhibits both anticlinal and periclinal division.
So the correct option is 'Anticlinal'.
Multiple choice properties of enzyme enzyme properties enzymes biomolecules: chemical constituents of living cells biology

Tyloses

  1. Are ballon-like swelling of xylem parenchyma cells in the lumen of vessels

  2. Are found in heartwood

  3. Make heartwood functional

  4. Both (A) and (B)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Tyloses are outgrowths on parenchyma cells of xylem vessels of secondary heartwood. When the plant is stressed by drought or infection, tyloses will fall from the sides of the cells and "dam" up the vascular tissue to prevent further damage to the plant. 
So the correct option is 'Are ballon-like swelling of xylem parenchyma cells in the lumen of vessels'.
Multiple choice properties of enzyme enzyme properties enzymes biomolecules: chemical constituents of living cells biology

Study the following lists .

List-I List-I
(A) Spongy aril (I) Jussiaea
(B) Mulhple epidermis (II) Pistia
(C) Respirato room (III) Nerium
(D) Root pockets (IV) Sagiuaria
(V) Nymphaea


The correct match is ___________.

  1. A B C D

    I III II V

  2. II I IV III

  3. IV I III I

  4. V III I II
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Matching the botanical features: Spongy aril is found in Nymphaea, multiple epidermis in Nerium, respiratory roots in Jussiaea, and root pockets in Pistia.

Multiple choice properties of enzyme enzyme properties enzymes biomolecules: chemical constituents of living cells biology

In the modern system of nomenclature which one of the following enzyme occupies 6th position _________________.

  1. enzyme occupies 6th position
    (a) Ligase

  2. Isomerase

  3. Lyase

  4. Hydrolase
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
According to the modern classification system, enzymes have been classified into six classes:
Class First is Oxidoreductases
Class Second is Transferases.
Class Third is Hydrolase.
Class Fourth is Lyase.
Class Fifth is Isomerase and
Class Sixth is Ligase.
Therefore A is the correct option. 
Multiple choice properties of enzyme enzyme properties enzymes biomolecules: chemical constituents of living cells biology

The nomenclatural type of a specimen selected by the author as substitute of a lost material on which the name of the taxon is base is called.

  1. Syntype

  2. Neotype

  3. Lectotype

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

According to the International Code of Nomenclature, a neotype is a specimen selected as the nomenclatural type when all original material is lost or destroyed. A lectotype is chosen from original material when no holotype was designated.