Select the correct statement from the following regarding cell membrane.
Na+ and K+ ions move across cell membrane by passive transport
Proteins make up 60 to 70% of the cell membrane
Lipids are arranged in a bilayer with polar heads towards the inner part
Lipids are arranged in a bilayer with polar heads towards the inner part
D.
Lipids are arranged in a bilayer with polar heads towards the inner part
In 1972, Singer and Nicolson proposed fluid mosaic model for internal structure of plasma membrane. This is most widely accepted model for plasma membrane. According to this model, a membrane consists of a continuous bilayer of phospholipid molecules in which globular proteins are embedded. The lipids are arranged in a bilayer with polar heads towards outerside.
Which one of the following statements is false in respect of viability of mammalian sperm ?
Sperm is viable for only up to 24 hours
Survival of sperm depends on the pH of the medium and is more active in alkaline medium
Viability of sperm is determined by its motility
Viability of sperm is determined by its motility
Vexillary aestivation is characteristic of the family
Fabaceae
Asteraceae
Solanaceae
Solanaceae
People who have migrated from the planes to an area adjoining Rohtang Pass about six months back
Have more RBCs and their haemoglobin has a lower binding affinity of O2
are not physically fit to play games like football
Suffer from altitude sickness with symptoms like nausea, fatigue, etc
Suffer from altitude sickness with symptoms like nausea, fatigue, etc
Select the correct statement from the ones given below with respect to Periplaneta americana
Nervous system located dorsally, consists of segmentally arranged ganglia joined by a pair of longitudinal connectives
Males bear a pair of short thread like anal styles
There are 16 very long Malpighian tubules present at the junctions of midgut and hindgut
There are 16 very long Malpighian tubules present at the junctions of midgut and hindgut
Select the correct statement regarding the specific disorder of muscular or skeletal system
Muscular dystrophy-age related shortening of muscles
Osteoporosis-decrease in bone mass and higher chances of fractures with advancing age
Myasthenia gravis-Auto immune disorder which inhibits sliding of myosin filaments
Myasthenia gravis-Auto immune disorder which inhibits sliding of myosin filaments
Motile zygote of Plasmodium occurs in
Human RBCs
Human liver
Gut of female Anopheles
Gut of female Anopheles
Gymnosperms are also called soft wood spermatophytes because they lack
cambium
phloem fibres
thick-walled tracheids
thick-walled tracheids
