AS Level Biology A H020/01 Breadth in
biology Thursday 25 May 2017 - Afternoon
QUESTIONS AND ANSWERS
1. 3 Which of the options, A to D, is a reason why vegetation require specialised shipping
tissue?
A to allow osmosis to take vicinity
B because all of them have a large surface place to volume ratio
C to hold sucrose to their leaves
D to overcome the constraints of diffusion over large distances - ANSWER-D
2. A group of college students changed into given a 1% solution of an unknown digestive
enzyme. They were also given three tubes containing an equal combination of foods.
The college students executed a different biochemical take a look at on every tube
earlier than and after including the unknown enzyme. Their outcomes are shown within
the desk beneath
(shade earlier than and colour after)
Biuret check pink crimson
Iodine take a look at blue / black yellow / orange
Benedict's take a look at brick purple brick purple
Name the type of enzyme the students used.
A protease
B carbohydrase
C lipase
D cellulase - ANSWER-B carbohydrase
3. A widespread approach may be used to extract DNA from the nuclei of cells in kiwi fruit.
The statements beneath listing some of the stairs concerned in this approach.
Which statement isn't always accurate?
A chop the kiwi fruit to break open cell membranes
B upload detergent to dissolve nuclear membranes
C upload protease to digest histone proteins
D pour ice bloodless ethanol onto filtrate to precipitate DNA - ANSWER-A
4. A scholar studied the structure of a blood vessel and determined: • an outer layer of
collagen fibers,
• a thick middle layer of clean muscle and elastic tissue,
• an innermost layer of endothelial cells.
Which of the alternatives, A to D, identifies the form of blood vessel the student studied?
A artery
B capillary
, C venule
D vein - ANSWER-A- Artery
5. Air movements inside and outside of human lungs through the trachea, which is coated
with cells. The diagram below suggests a segment containing these cells
Which of the following statements about tracheal cells is correct?
A Cells X, Y and Z are all columnar epithelial cells.
B Cells X and Y flow mucus and trapped micro organism out of the trachea. C Cell X
releases mucus into the trachea.
D Cell Z is a goblet mobile. - ANSWER-C
6. Describe and provide an explanation for the pattern of data proven on the graph as
temperature boom (on the beetroot membrane permeability) - ANSWER--as temp will
increase, absorbance additionally will increase
At better temp
-There is a STEEP will increase in absorbance
-membrane is broken/more permeable
7. Describe how the price of reaction become calculated - ANSWER-1/time
8. DNA ligase is one enzyme worried inside the replication of DNA. State two different
enzymes involved and describe their capabilities. - ANSWER-Dna helicase- unzips the
DNA molecule
Dna polymerase- bureaucracy phosphodiester bonds
9. During DNA replication, DNA polymerase can handiest paintings in a single path - from
the three' give up to the five' quit. This approach that the lagging strand has small gaps
left within the backbone. DNA ligase works to seal those gaps. Which of the alternatives,
A to D, identifies the bond formed? A hydrogen bond
B phosphodiester bond
C glycosidic bond
D peptide bond - ANSWER-B- Phosphodiester bond
10.Explain what the same old deviation suggests in Table 26. - ANSWER-As the
awareness will increase, trendy deviation also will increase (for the first four
concentrations)
All concentrations have small SD
11.Explain why onion root pointers have been used to view cells undergoing mitosis -
ANSWER-Site of cellular division
is meristem
Fig. 26 shows the results plotted on a graph with the same old deviations as
blunders bars
12.Explain the sample shown inside the facts the usage of Table 26 and Fig. 26 -
ANSWER-As the enzyme concentration increases,
the fee of digestion increases
due to the fact more escs formed
because the enzyme awareness increases the ,
attention / availability ,
of substrate stays the equal
three fee , plateaus / ranges off , due to the fact ,
biology Thursday 25 May 2017 - Afternoon
QUESTIONS AND ANSWERS
1. 3 Which of the options, A to D, is a reason why vegetation require specialised shipping
tissue?
A to allow osmosis to take vicinity
B because all of them have a large surface place to volume ratio
C to hold sucrose to their leaves
D to overcome the constraints of diffusion over large distances - ANSWER-D
2. A group of college students changed into given a 1% solution of an unknown digestive
enzyme. They were also given three tubes containing an equal combination of foods.
The college students executed a different biochemical take a look at on every tube
earlier than and after including the unknown enzyme. Their outcomes are shown within
the desk beneath
(shade earlier than and colour after)
Biuret check pink crimson
Iodine take a look at blue / black yellow / orange
Benedict's take a look at brick purple brick purple
Name the type of enzyme the students used.
A protease
B carbohydrase
C lipase
D cellulase - ANSWER-B carbohydrase
3. A widespread approach may be used to extract DNA from the nuclei of cells in kiwi fruit.
The statements beneath listing some of the stairs concerned in this approach.
Which statement isn't always accurate?
A chop the kiwi fruit to break open cell membranes
B upload detergent to dissolve nuclear membranes
C upload protease to digest histone proteins
D pour ice bloodless ethanol onto filtrate to precipitate DNA - ANSWER-A
4. A scholar studied the structure of a blood vessel and determined: • an outer layer of
collagen fibers,
• a thick middle layer of clean muscle and elastic tissue,
• an innermost layer of endothelial cells.
Which of the alternatives, A to D, identifies the form of blood vessel the student studied?
A artery
B capillary
, C venule
D vein - ANSWER-A- Artery
5. Air movements inside and outside of human lungs through the trachea, which is coated
with cells. The diagram below suggests a segment containing these cells
Which of the following statements about tracheal cells is correct?
A Cells X, Y and Z are all columnar epithelial cells.
B Cells X and Y flow mucus and trapped micro organism out of the trachea. C Cell X
releases mucus into the trachea.
D Cell Z is a goblet mobile. - ANSWER-C
6. Describe and provide an explanation for the pattern of data proven on the graph as
temperature boom (on the beetroot membrane permeability) - ANSWER--as temp will
increase, absorbance additionally will increase
At better temp
-There is a STEEP will increase in absorbance
-membrane is broken/more permeable
7. Describe how the price of reaction become calculated - ANSWER-1/time
8. DNA ligase is one enzyme worried inside the replication of DNA. State two different
enzymes involved and describe their capabilities. - ANSWER-Dna helicase- unzips the
DNA molecule
Dna polymerase- bureaucracy phosphodiester bonds
9. During DNA replication, DNA polymerase can handiest paintings in a single path - from
the three' give up to the five' quit. This approach that the lagging strand has small gaps
left within the backbone. DNA ligase works to seal those gaps. Which of the alternatives,
A to D, identifies the bond formed? A hydrogen bond
B phosphodiester bond
C glycosidic bond
D peptide bond - ANSWER-B- Phosphodiester bond
10.Explain what the same old deviation suggests in Table 26. - ANSWER-As the
awareness will increase, trendy deviation also will increase (for the first four
concentrations)
All concentrations have small SD
11.Explain why onion root pointers have been used to view cells undergoing mitosis -
ANSWER-Site of cellular division
is meristem
Fig. 26 shows the results plotted on a graph with the same old deviations as
blunders bars
12.Explain the sample shown inside the facts the usage of Table 26 and Fig. 26 -
ANSWER-As the enzyme concentration increases,
the fee of digestion increases
due to the fact more escs formed
because the enzyme awareness increases the ,
attention / availability ,
of substrate stays the equal
three fee , plateaus / ranges off , due to the fact ,
