Select the answer with the correct matching of the structure, its location and function.
Structure |
Location |
Function |
Eustachian |
Anterior part of internal ear |
Equalizes air pressure on either sides of tympanic membrane |
Structure |
Location |
Function |
Cerebellum |
Mid -brain | Controls respiration and gastric secretions |
Structure |
Location |
Function |
Hypothalamus |
Forebrain | Control body temperature, urge for eating and drinking |
Structure |
Location |
Function |
Hypothalamus |
Forebrain | Control body temperature, urge for eating and drinking |
Select the correct combination of the statement (A-D) regarding the characteristics of certain organisms.
A. Methanogens are Archaebacteria, which produce methane in marshy areas.
B. Nostoc is a filamentous blue-green algae, which fixes atmospheric nitrogen.
C. Chemosynthetic autotrophic bacteria synthesise cellulose from glucose.
D. Mycoplasma lacks a cell wall and can survive without oxygen.
B, C
A, B,C
B, C, D
B, C, D
Which one of the following is the correct description of a certain part of a normal human skeleton?
Parietal bone and the temporal bone of the skull are joined by fibrous joint
First, vertebra is axis, which articulates with the occipital condyles
The 9th and 10th pairs of ribs are called the floating ribs
The 9th and 10th pairs of ribs are called the floating ribs
The 3' 5' phosphodiester linkages inside a polynucleotide chain serve to join
one DNA strand with the other DNA strand
one nucleoside with another nucleoside
one nucleotide with another nucleotide
one nucleotide with another nucleotide
Identify the components labelled A, B, C and D in the diagram below from the list 1 to 8 given along with
1) Cristae of mitochondria
2) Inner membrane of mitochondria
3) Cytoplasm
4) Smooth endoplasmic reticulum
5) Rough endoplasmic reticulum
6) Mitochondrial matrix
7) cell vacuole
8) Nucleus
A |
B |
C |
D |
5 |
4 |
8 |
3 |
A |
B |
C |
D |
1 |
4 |
8 |
6 |
A |
B |
C |
D |
6 |
5 |
4 |
7 |
A |
B |
C |
D |
6 |
5 |
4 |
7 |
The figure given below shows the conversion of a substrate to product by an enzyme. In which one of the four option (a-d), the components of reaction labelled as A, B, C and D are identified correctly?
A |
B |
C |
D |
Potential energy |
Transition state |
Activation energy with enzyme |
Activation energy without enzyme |
A |
B |
C |
D |
Transition energy |
Potential energy |
Activation energy with enzyme |
Activation energy with out enzyme |
A |
B |
C |
D |
Potential energy |
Transition energy |
Activation energy with out enzyme |
Activation energy with enzyme |
A |
B |
C |
D |
Potential energy |
Transition energy |
Activation energy with out enzyme |
Activation energy with enzyme |
B.
A |
B |
C |
D |
Transition energy |
Potential energy |
Activation energy with enzyme |
Activation energy with out enzyme |
The amount of energy required to raise the energy of molecules at which chemical reaction can occur is called activation energy. Thus, acitvatgion energy is actually the energy required to form the transition state. Enzymes dramatically reduce the activation energy of a reaction, so that most molecules can easily get over the activation energy barrier and quickly turn into product. Simply we can say that activation energy of an enzyme catalysed reaction is lower than that of an uncatalysed reaction.
Examine the figure A, B, C, and D. In which one of the four options, all the items A, B, C and D are correct.
A |
B |
C |
D |
Chara |
Marchantia |
Fucus |
Pinus |
A |
B |
C |
D |
Equisetum |
Ginkgo |
Selaginella |
Lycopodium |
A |
B |
C |
D |
Selaginella |
Equisetum |
Salvinia |
Ginkgo |
A |
B |
C |
D |
Selaginella |
Equisetum |
Salvinia |
Ginkgo |