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1) D?
13)D
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A level Biology: Post your doubts here!
- Thread starter XPFMember
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13)D
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1)D?
13)C
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neither do i...even our teacher has difficulty in explaining it..
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neither do i...even our teacher has difficulty in explaining it..
qs 13 is C
bcuz if an inhibitor was present no enzyme reaction would ve taken place so it cant be A
it cant be D or B bcuz as u see the concentration of sucrose is still increasing which mean its nt limiting and it cant be substrate being used up
So its C bcuz thts the Vmax point where most enzymes have been used up
hope u get it :/
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I'm sorry if this is a silly question but what does soil condition mean?? What has this got to do with rhizobium requiring anaerobic conditions...
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Q1:
I don't know if you've used microscopes before (you must actually it's really important for practical) but eyepiece graticule is just something you put in front of the lens. It overlaps a ruler in front of your image. Imagine taking a picture and placing a ruler on top of it. Like this:
Does it mean anything? Not at all! It has no units, you can't tell what exactly one line width represents... Is it 1m? 1km? 10km?? (Yes, the ruler line width is 1 cm, but what that represents on the picture, which has been taken at a distance or enlarged, is impossible to tell)
Now imagine zooming into this picture, and placing the same ruler:
Did this change the size of this ruler? No! The ruler remains fixed. The scale has changed now, each centimetre of this ruler represents a shorter length (say, instead of representing 1km before, now it does 100m only), because the magnification has changed.
So to the questions:
1. Does this ruler allow you to measure actual distances depicted in this picture? Definitely NOT! You don't know what exactly each centimeter on the ruler means.
2. Does it help you in judging relative proportions in a picture. Yeah!! By moving the picture (specimen), you can measure different parts of the mountain in centimeters and get an idea of what is big and small, etc. It will help you draw this mountain!
3. Did zooming into the pic make our ruler somehow bigger as well? Certainly NOT
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Answer should be C. Number of bubbles should be rounded off to a whole number, how can you have 9.2 bubbles? Our measuring device (ie our eyes) cannot measure fractions of bubbles. Furthermore, there is no justification for having two, or three significant figures in our calculated result when our raw data did not have as many.
So only student 2 did it correct.
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is it C???
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I gtg now if it's correct plz confirm once i come back I'll explain insha Allah
no its A...alryt thnk u
arterial blood indicates the oxygenated blood, and the venous blood is the deoxygenated blood
difference in volume of oxygen carried is 19 - 12.5 = 6.5 cm^3 of oxygen. <----- this oxygen is gained from the lungs
so 6.5 cm^3 of oxygen is gained every 100 cm^3 of blood solution.
adult human has a total of 5dm^3 of blood solution = 5000 cm^3 blood
so 6.5 x (5000/100) = 325
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Studydayandnight ...HERES YOUR ANSWERRRRRR
arterial blood indicates the oxygenated blood, and the venous blood is the deoxygenated blood
difference in volume of oxygen carried is 19 - 12.5 = 6.5 cm^3 of oxygen. <----- this oxygen is gained from the lungs
so 6.5 cm^3 of oxygen is gained every 100 cm^3 of blood solution.
adult human has a total of 5dm^3 of blood solution = 5000 cm^3 blood
so 6.5 x (5000/100) = 325
Which statement concerning events occurring in the nitrogen cycle is not correct?
A Free-living nitrogen-fixing bacteria release organic nitrogen compounds into the soil where bacteria convert these to nitrites and nitrates.
B Nitrifying bacteria cause an increase in nitrate ions which are used by plants to make proteins.
C Nitrogen-fixing bacteria use atmospheric nitrogen which is replaced by the action of denitrifying bacteria in waterlogged soil.
D Saprophytic bacteria and fungi decompose organic nitrogen compounds excreted and egested by producers and consumers.
................hows the correct ans D?
Q2How does sucrose move from chloroplasts to the phloem?
1 mass flow
2 apoplast pathway
3 symplast pathway
A 1, 2 and 3
B 1 and 2 only
C 1 and 3 only
D 2 and 3 only
...............hows the ans D?
A Free-living nitrogen-fixing bacteria release organic nitrogen compounds into the soil where bacteria convert these to nitrites and nitrates.
B Nitrifying bacteria cause an increase in nitrate ions which are used by plants to make proteins.
C Nitrogen-fixing bacteria use atmospheric nitrogen which is replaced by the action of denitrifying bacteria in waterlogged soil.
D Saprophytic bacteria and fungi decompose organic nitrogen compounds excreted and egested by producers and consumers.
................hows the correct ans D?
Q2How does sucrose move from chloroplasts to the phloem?
1 mass flow
2 apoplast pathway
3 symplast pathway
A 1, 2 and 3
B 1 and 2 only
C 1 and 3 only
D 2 and 3 only
...............hows the ans D?
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