AS Biology P1 MCQs Preparation Thread

[sarasousou1996]

hey can someone help me with this questions from novmeber 2011 variant 1
Which does not increase the efficiency of gaseous exchange in the alveoli?
A The blood capillaries and alveoli have a large total surface area.
B The blood flow is slowed as it passes through the pulmonary capillaries.
C The walls of the alveoli and capillaries are moist.
D The walls of the alveoli and capillaries are very thin.

why is the answer C ?? i always studies that moist surfaces help rapid diffusion of the gases?

 

[Soldier313]

hey can someone help me with this questions from novmeber 2011 variant 1
Which does not increase the efficiency of gaseous exchange in the alveoli?
A The blood capillaries and alveoli have a large total surface area.
B The blood flow is slowed as it passes through the pulmonary capillaries.
C The walls of the alveoli and capillaries are moist.
D The walls of the alveoli and capillaries are very thin.

why is the answer C ?? i always studies that moist surfaces help rapid diffusion of the gases?

it does help gaseous exchange coz gases dissolve in the moist air, however it does not increase the ''EFFICIENCY'', which is what the examiner is asking abt here...
hope that helped

 

[Soldier313]

what is the size of centriole?

 

[XPFMember]

Aoa!
why cant male bees be genetically identical?

 

[Soldier313]

Aoa!
why cant male bees be genetically identical?
View attachment 12913

they can't be genetically identical cause they are not formed by mitosis.....only organisms formed by mitosis are genetically identical

 

[Zari]

Aoa can anyone explain the difference between the composition of tissue fluid and lymph ?plz

 

[Soldier313]

Aoa can anyone explain the difference between the composition of tissue fluid and lymph ?plz

tissue fluid has a higher water potential than lymph, this is what i know

 

[The King XII]

tissue fluid has a higher water potential than lymph, this is what i know

Not only that Proteins and and more phagocytes are present in lymph

 

[Soldier313]

this is the trend for hydrolytic enzyme activity, can someone please explain the reason for this trend?

 

[Soldier313]

Not only that Proteins and and more phagocytes are present in lymph

so basically there are no proteins in tissue fluid?

 

[The King XII]

so basically there are no proteins in tissue fluid?

Yep

 

[Soldier313]

this is the trend for hydrolytic enzyme activity, can someone please explain the reason for this trend?View attachment 12914

The King XII can u please help with this

 

[sarasousou1996]

it does help gaseous exchange coz gases dissolve in the moist air, however it does not increase the ''EFFICIENCY'', which is what the examiner is asking abt here...
hope that helped

how come? i read alot of websites and all said it increases efficiency because without moisture the gases cannot diffuse rapidly so decreasing efficiency and moisture was always one of the points for efficiency of gaseous exchange surfaces

 

[Zari]

Not only that Proteins and and more phagocytes are present in lymph

Thanks for telling this and what about the conc. of sodium ions ??

 

[The King XII]

The King XII can u please help with this

OKay sure ummm lysosomes obviously have high enzyme activity because they are just vesicles packed with hydrolytic enzymes 2. mitichondria is semi-autonomous organelle that has ribosomeS so obviously enzymes are proteins right so the more the ribosomes the more the hydrolytic activity 3. nuclei manufacture ribosomes (nucleolus) but as you can see they get out of the nucleus so is there isn't much so low activity 4. a single ribosome won't do much damage

 

[XPFMember]

Yep

u sure? i remember i did a question in which they said...it does have protein...not sure...lemme search..

 

[The King XII]

u sure? i remember i did a question in which they said...it does have protein...not sure...lemme search..

lol yeah Im VERY SURE.

 

[Irfan1995]

Aoa!
why cant male bees be genetically identical?
View attachment 12913

The second sentence says it all: "They develop from unfertilized eggs"
That means that they have gone through meiosis which means that chromosomes have crossed-over and have gone through independent assortment (mixing up of genes from the original gametes)

 

[Soldier313]

how come? i read alot of websites and all said it increases efficiency because without moisture the gases cannot diffuse rapidly so decreasing efficiency and moisture was always one of the points for efficiency of gaseous exchange surfaces

hmm i dunno this is what i understood when i did the qn......can anybody please assist sarasousou1996 with this

 

[The King XII]

u sure? i remember i did a question in which they said...it does have protein...not sure...lemme search..

oh yeah and BTW they don't have platelets either.