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A level Biology: Post your doubts here!
need help! (9700/12/M/J/14) Q37) An antiserum to a snake toxin can be obtained by injecting the toxin into a horse. The antiserum is made from blood plasma taken from the horse a few weeks later. The antiserum is injected into a person who has been bitten by the same species of snake. What... -
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A level Biology: Post your doubts here!
yes, plasma has a higher concentration of protein compared to tissue fluid and lymph -
A level Biology: Post your doubts here!
um i think lymph has lipids as opposed to plasma and tissue fluid -
A level Biology: Post your doubts here!
all my values were written to two decimal places. i recall my teacher asking us to do so -
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A level Biology: Post your doubts here!
i just did this question and got pretty confused. thought the answer was D but marking scheme says its C. thought only emphysema damages the alveoli but turns out chronic bronchitis too damages the alveoli -
A level Biology: Post your doubts here!
tar in cigarette smoke damages the gas exchange system. it inhibits the function of the cilia and stimulates goblet cells to secrete more mucus, which means that tar directly affects ciliated epithelial cells (labelled as Y in the diagram) and goblets cells (labelled as X in the diagram). so the... -
A level Biology: Post your doubts here!
hehe, its okay. glad i could help X -
A level Biology: Post your doubts here!
never thought id say this but i think the marking scheme youre referring to is wrong. lipid synthesis only occurs in mitochondria and smooth endoplasmic reticulum and the label doesnt point to either of these organelles -
A level Biology: Post your doubts here!
47 and 33 are definitely correct but im not really sure about 37 -
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A level Biology: Post your doubts here!
yes, X is rough endoplasmic reticulum. the function of the rough endoplasmic reticulum is to manufacture proteins as well as transport them via vesicles so the answer is D -
A level Biology: Post your doubts here!
during telophase, the nucleus divides into two so each chromatid goes into two daughter cells therefore, the dna content of one cell decreases, which is represented on the graph by the sudden drop. this is why the answer is D -
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A level Biology: Post your doubts here!
im sorry but i dont really know the answer to that question. i need to revise transport in plants ☺