Which one of the following is essential for photolysis of water
Manganese
Zinc
Copper
Copper
A.
Manganese
Photolysis of water requires light energy and oxygen evolving complex (OEC) and an electron carrier Yz. OEC complex was formerly called Z - enzyme. It has four Mn ions. Light energy brings about changes in Mn (Mn+2, Mn3+ Mn+4) which helps in removing electrons from OH- component of water forming oxygen.Liberation of oxygen also requires Cl- and Ca2+.
The type of muscles present in our
heart are involuntary and unstriated smooth muscles
intestine are striated and involuntary
thigh are striated and voluntary
thigh are striated and voluntary
The 24 hour (diurnal) rhythm of our body such as the sleep -wake cycle is regulated by the hormone
Calcitonin
prolactin
adrenaline
adrenaline
Three of the following pairs of the human skeletal parts are correctly matched with their respective inclusive skeletal category and one pair is not matched. Identify the non -matching pair.
Pairs of skeletal parts |
Category |
Sternum and ribs |
Axial skeleton |
Pairs of skeletal parts |
Category |
Clavicle and glenoid cavity |
Pelvic girdle |
Pairs of skeletal parts |
Category |
Humerus and ulna |
Appendicular skeleton |
Pairs of skeletal parts |
Category |
Humerus and ulna |
Appendicular skeleton |
Which one of the following aspects is an exclusive characteristic of living things?
Isolated metabolic reactions occur in vitro
Increase in mass from inside only
Perception of events happening in the environment and their memory.
Perception of events happening in the environment and their memory.
Given below is the ECG of a normal human. Which one of its components is human, which one of its components is correctly interpreted below?
complex QRS - One complete pulse
Peak T - Initiation of total cardiac contraction
peak P and peak R together - systolic and diastolic blood pressures
peak P and peak R together - systolic and diastolic blood pressures
The figure below shows the structure of a mitochondrion with its four parts labelled (A), (B), (C) and (D). Select the part correctly matched with its function
D - outer membrane -gives - rise to inner membrane by splitting
B - Inner membrane - forms infolding called cristae
C - Cristae - possess single circular DNA molecule and ribosomes
C - Cristae - possess single circular DNA molecule and ribosomes
The figure shows four animals (A),(B) (C) and (D). Select the correct answer with respect to common characteristics of two animals.
(A) and (D) respire mainly through the body wall
(B) and (C) shows radial symmetry
(A) and (B) have cnidoblasts for self -defence
(A) and (B) have cnidoblasts for self -defence