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it depends on the temperature...it keeps the membrane from becoming too solid in cold and keeps it from becoming too fluid in high temps.
16) As far as I know, cholesterol keeps a balance of fluidity. At low temperatures, the phospholipids should crystallize (become like a solid). Cholesterol has an irregular shape, so it doesn't fit perfectly in the membrane. This prevents phospholipids from going too close to each other, so the presence of cholesterol prevents membrane crystallization.
24) If you just read option 3, you can immediately point out that it's wrong. When water travels through the plasmodesmata (junction between two cells), that is considered as the symplast pathway (not the apoplast). When you eliminate option 3, choice A is the only option available.
Option 1 is true, as water passes by the root through osmosis (down a concentration gradient). It can travel either through the apoplast pathway or the symplast pathway.
Option 2 is wrong because water passes up the xylem through capillary pull.
33) Option 1: high blood pressure could damage artery walls leading to atheromae (which leads to blood clots)
Option 2: deposits of fatty materials in arteries definitely results in heart failure. But fatty deposits in VEINS do not. The option implies that fatty deposits in both arteries AND veins contribute to heart failure, which is wrong.
Option 3: The cardiac muscle is simply the heart. If it can't receive enough oxygen, it can't receive any energy necessary for contraction.
Option 4: If a blood clot occurs near the coronary artery, it will cut off blood supply to the heart. The heart can't receive any glucose nor oxygen (this results to the same situation as that in option 3)
Good luck
Thank youu ! Yes it did.But don't we subtract the 1200 too?
semi conservative replication kaisay hogi? there is just one mother DNA which will be copied into two DNA as it is... isnt that ryt?
in that case semi-conservation does not apply here at all ryt??
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