Tag: biology

Questions Related to biology

Cockroaches have an outer skeleton.

biology movement and locomotion in man locomotion in animals bones and movements muscle contraction

  1. True

  2. False

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Correct Option: A
Explanation:
An exoskeleton is the external skeleton that supports and protects an animal's body. Examples of animals with exoskeletons include insects such as grasshoppers and cockroaches, and crustaceans such as crabs and lobsters.
Cockroaches are winged insects found in nearly every part of the world. Like most other insects, cockroaches have an exoskeleton, meaning their skeleton is located on the outside of their bodies. They have three simple body parts: the head, thorax, and abdomen.
Hence, the answer is true.

Which one of the cartilage helps in early birth of a child,
without damage to the pelvic girdle

biology movement and locomotion in man locomotion in animals bones and movements muscle contraction

  1. Hyaline cartilage

  2. Elastic cartilage

  3. Calcified cartilage

  4. Fibrous cartilage

Show answer
Correct Option: D
Explanation:

During the birth of child pubic symphysis which is made up of fibrous cartilage relaxes inaeasing`the space for the exit of the child.

EDTA injected into muscles combines with $Ca^{2+}$ and

biology skeleton and movements locomotion in animals bones and movements muscle contraction

  1. Stops contraction

  2. Causes contraction

  3. Slows down contraction

  4. None of the above

Show answer
Correct Option: C
Explanation:
  • Active sites for myosin are present on actin which are masked by troponin in resting state. When  Ca++ level increases it leads to the binding of calcium with a subunit of troponin on actin(thin) filaments and thereby remove the masking of active sites for myosin.
  • Utilizing the energy from ATP hydrolysis, the myosin head now binds to the exposed active sites on actin to form a cross bridge. 
  • This pulls the attached actin filaments towards the centre of ‘A’ band.
  •  The ‘Z’ line attached to these actins are also pulled inwards thereby causing a shortening of the sarcomere, i.e., contraction.
  • When EDTA  injected into muscles combines with Ca ++ and prevents the binding of calcium with troponin and slows down contraction.
  • So, the correct answer is 'Slows down contraction'. 

The cartilage which is present in nasal septum is aIso found in :-

biology skeleton - movement and locomotion locomotion in animals bones and movements muscle contraction

  1. Pubic symphysis

  2. Tip of nose

  3. Ear pinna

  4. Sternal part of ribs

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Correct Option: A

In addition to muscular system, vertebrates have evolved______ system for faster locomotion.

biology the biology of movement locomotion in animals bones and movements muscle contraction

  1. Respiratory

  2. Skeletal

  3. Excretory

  4. Circulatory

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Correct Option: B

The joint between the carpal bones and tarsal bones is

biology skeleton - movement and locomotion locomotion in animals bones and movements muscle contraction

  1. Gliding joint

  2. Ball and socket joint

  3. Hinge joint

  4. Saddle joint

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Correct Option: A
Explanation:

A gliding joint is the simplest of the synovial joints. Gliding joints are found between the carpal bones and between the tarsal bones.

Which one of the following pairs is correctly matched?

biology movement and locomotion in living organisms locomotion in animals bones and movements muscle contraction

  1. Nutation- Movement due to injury

  2. Traumatotropism- Movement due to change in turgor pressure

  3. Thigmotropism- Movement of tendrils due to contact

  4. Seism nasty- Movement of stem tips of twining plants

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Correct Option: A

An organic compound has a triple bond and double bond. It can be tested by :

biomacromolecules biotechnology cell biology and biotechnology biomolecules biology

  1. Bromine water

  2. Beyer's reagents

  3. Fehling's solution

  4. Ammonical $AgNO _3$

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Correct Option: A
Explanation:
The bromine test is a qualitative test for the presence of unsaturation (carbon-to-carbon double or triple bonds) and phenols. An unknown sample is treated with a small amount of elemental bromine in an organic solvent, being as dichloromethane or carbon tetrachloride. Presence of unsaturation and/or phenol in the sample is shown by disappearance of the deep brown coloration of bromine when it has reacted with the unknown sample. 
So, the correct option is 'Bromine water'.

What is common between NAD and FAD?

biomacromolecules biotechnology cell biology and biotechnology biomolecules biology

  1. Both are coenzymes

  2. Both are derived from proteins

  3. Both acts as oxygen carriers

  4. All of the above

Show answer
Correct Option: A
Explanation:

Nicotinamide Adenine Dinucleotide (NAD) and Flavin Adenine Dinucleotide (FAD) are coenzymes associated with reversible oxidation and decrease reactions. Then, these lessened coenzymes can give these electrons to some other biochemical response ordinarily engaged with a procedure that is anabolic (like the union of ATP).

So, the correct option is 'Both are coenzymes'.

Match and choose the true option.

biomacromolecules biotechnology cell biology and biotechnology biomolecules biology

  1. $NaCl$ - Inorganic micromolecule

  2. ${H} _{2}O$ - Organic micromolecule

  3. Starch - Organic micromolecule

  4. Glucose - Inorganic macromolecule

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Correct Option: A
Explanation:
Organic molecules are made of chains of carbon atoms. Inorganic molecules are minerals like salts NaCl which held together by an ionic bond.
Water doesn't contain any carbon atom in its molecule.  So water is an inorganic compound. 
So the correct answer is A.