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WorksheetsBiology Masterclass
Total questions: 13
Worksheet time: 9mins
Consider an enzyme- facilitated reaction in which the concentration of the enzyme is constant. Which one of the following graphs shoes the effect of increasing substrate concentration on the rate of product formation
Which one of the following is a correct summary of the main events in photosynthesis?
Light is required to join carbon dioxide to hydrogen ( which was split from water using ATP) in carbohydrate production
Oxygen reacts with a carbohydrate to produce water and carbon dioxide in the presence of light
Light splits Carbon dioxide producing oxygen gas, and the resulting carbon then combines with oxygen and hydrogen obtained from water to produce carbohydrate
Carbon dioxide combines with hydrogen split from water by light to produce carbohydrate using ATP
Tryptophan is an amino acid that is used by many bacteria. Genes that code for the production of tryptophan are found on bacterial DNA together ( trp operon). In the process of gene regulation, a repressor protein binds to the trp operon. When binding occurs, the process of tryptophan production stops. This is seen in the diagram below. When this binds, which of the following would be blocked from functioning normally
DNA polymerase
RNA polymerase
Endonuclease
DNA ligase
s. anatum is not a common cause of food poisoning. The graph blow displays the average monthly notification rate per 100,000 of the population for the illness over a 5 year period. it can be concluded from the data that
there are four periods in which the notification rate is greater than six per 100,000
the notification rate is always lowers during September of each year
the notification rate is fairly steady over the 5 year period
the notification rate in 2001 was highest in may
In the production of isoleucine from threonine in bacteria ( Biochemical Pathway 1 = BP1) the end product acts as an inhibitor of the first enzyme in the pathway. In the production of arginine (BP2) the end product has no influence on other enzymes. It is reasonable to conclude that
BP 1, if the production of enzyme 3 stops there would be continuous production of isoleucine
BP2, providing all enzymes are present, the production of arginine would be continuous if there was a continuous supply of substrate
BP2, if the production of enzyme 3 stops there would be continuous production of arginine
BP1, providing all enzymes are present, the production of isoleucine would be continuous if there was a continuous supply of threonine
The diagram shows a summary of steps in the insulin signalling pathway that results in increased glucose. A scientist studied this pathway in Eleni and Shani. Elenis pathway is the same as the diagram above. The scientist discovered the gene that encodes for the insulin receptor in Shani has a mutation and insulin cannot bind. From this information it is correct to conclude
Insulin acts as a hydrophobic signalling molecule in Eleni and Shani
Insulin will bind to a different receptor and activate different secondary messengers in Shani
Shani is unable to produce the secondary messengers required for transduction
The presence of insulin in Eleni would cause an increase in the concentration of secondary messenger molecules
Hybridoma cells are used to produce monoclonal antibodies because:
They do not replicate
They act on multiple antigens
Their antibodies replicate
Plasma cells are short-lived
In India, scientists was studying fossils from a coal deposit formed during the Permian period (290–245 million years ago). They found three fossil species from the same genus in different levels (strata) of the coal. When radiocarbon dating on these fossils was performed, it showed exactly the same levels of carbon-14 in all three fossil species. The data is summarised in the table. Which of the following is the correct conclusion to draw from these findings
There is no evolutionary relationship between these three fossil species.
G. clarkeana is the common evolutionary ancestor of G. major and G. obliqua
As carbon dating is a more reliable dating technique than analysis of strata in coal deposits, the fossils of G. major, G. obliqua and G. clarkeana are all of the same age.
An analysis of strata in coal deposits is a more reliable dating technique than carbon dating for Permian fossils; the fossil of G. major is younger than the fossil of G. obliqua.
Cells break down hydrogen peroxide into water & oxygen gas with the help of the enzyme catalase. The optimum pH is 7. Student used potato mixed with distilled water and hydrogen peroxide added
Test 1 used 5 mL of 3% hydrogen peroxide solution and 0.5 mL of catalase suspension at 20 °C in a buffer solution (pH 7) Test 2 was carried out under identical conditions to Test 1, except for one factor that the student changed. An explanation for the results of test 2 would be:
Increased the concentration of catalase by adding less water to the ground potato
increased the temperature by placing the test tube in a water bath set at 30 °C.
used a hydrogen peroxide solution with a higher concentration
added a catalase suspension made from a cooked potato chip.
A class of Biology students were investigating antibiotic resistance in the bacteria Escherichia coli. Each of the students carried out identical tests at the same time and in the same environment. The results were consistent across the class except for the results of one student. What type of error caused this one different result?
Random Error
Systematic Error
Selection Bias
Repeatability
The letters A, B and C represent the effect if increasing sybstrate concentration on the rate of an enzyme catalysed reaction in the presence of...
A = No Inhibitor
B= Non-competitive inhibitor
C= Competitive Inhibitor
A = No Inhibitor
B= Competitive inhibitor
C= Non- competitive Inhibitor
A = Non- competitive Inhibitor
B= No Inhibitor
C= Competitive Inhibitor
A = Competitive Inhibitor
B= Non competitive Inhibitor
C= No Inhibitor
A bacterial plasmid was cut using the restriction enzyme
Alu I. This resulted in the production of three DNA fragments of 760 kbp, 280 kbp and 160 kbp length respectively. This indicates that the original plasmid was a double stranded length of DNA
1200 kbp long with three Alu I restriction sites
1200 kbp long with four Alu I restriction sites
600 kbp long with three Alu I restriction sites
600 kbp long with four Alu I restriction sites
Which of the following statements would be true of the coenzyme involved in metabolism
NAD is loaded into NADH as a result of the light independent reaction of photosynthesis
NADPH is formed during glycolysis
ATP is unloaded into ADP after the electron transport chain
ADP is loaded into ATP during the Krebs cycle
