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WorksheetsSTPM Biology 2023 Term 1 MCQ
Total questions: 15
Worksheet time: 8mins
Which are true about amylopectin?
I Has osmotic influence in the cell
II Has more branches than amylose
Ill Turns to dark blue when iodine is added
IV Possesses 1,4-glycosidic and 1,6-glycosidic bonds
I and III
I and IV
II and III
II and IV
Lipid contains more energy than carbohydrate. Which is the reason for the difference?
The process of phosphorylation occurs
The presence of carboxyl group
The presence of glycerol group
The process of oxidation occurs more often
Which is not true about nucleotides?
Thymine is found only in DNA.
Adenine, guanine and cytosine are found in DNA and RNA.
Uracil is found only in RNA and can be replaced with thymine.
Adenine pairs with thymine or uracil, and guanine pairs with cytosine.
The chromatogram for the separation of three pigments, P, Q and R, is shown in the diagram. Which is true about the pigments?
P is bigger than Q.
P has the highest charge.
Q has a higher solubility in the solvent compared to R
P has higher adsorption towards the chromatograph~ paper.
Which is the unique characteristic of prokaryotes?
The presence of nucleoid
The presence of linear DNA
The presence of 80S ribosome
The presence of 9+2 flagella
Which is not the function of endoplasmic reticulum?
Involves in lipid synthesis
Involves in protein synthesis
Forms compartments in the cell
Packages proteins to be exported out of the cell
The fluid mosaic model of membrane structure is shown in the diagram. Which are true about X?
I Involves in cell-cell recognition
II Involves in sticking cells in tissues
ill Contributes to the amphipathic properties of the membrane lipid
IV Provides selective transport for the molecules across the membrane
I and II
I and IV
II and III
III and IV
Which process involves the formation of cytoplasmic extension for bulk transport across the plasma membrane?
Pinocytosis
Phagocytosis
Exocytosis
Receptor-mediated endocytosis
Which statement is not true about an induced fit model?
The active site of the enzyme is specific for one substrate only.
The mechanism causes stressing and distortion of the chemical bonds on the substrates.
The enzyme molecule moulds around the substrate after the enzyme binds to the active site.
The structure of the enzyme returns to its original conformation after the product is released.
The Lineweaver-Burk plot for the rate of reactions using two enzymes, X and Y, that involved the same substrate is shown in the graph.
Which statements are true about the Lineweaver-Burk plot?
I KM value of X is higher.
II X has a higher Vmax value.
III Y has a higher affinity towards the substrate.
IV The reaction that is catalysed by X produces more products when the concentration of substrate is limited.
I and II
I and III
II and IV
III and IV
The information about a class of enzyme according to the International Union of Biochemistry (IUB) classification are given below.
• The reaction requires ATP
• The enzyme catalyses the formation of bond between two substrates
• An example of the enzyme is aminoacyl tRNA synthetases
Which class of enzyme has the above information?
Hydrolase
Ligase
Lyase
Transferase
The number of ATP produced via substrate level phosphorylation in Krebs cycle from one
molecule of pyruvate is ______.
1
2
4
6
Which is the process that occurs in an aerobic respiration when lipids are used as the energy source?
The long fatty acid molecules are shortened to three carbon atoms at each cycle.
The fatty acids are converted to acetyl CoA before entering the Krebs cycle.
The glycerol is converted to glucose for glycolysis.
The process does not produce water molecules.
Which organisms are photoautotroph?
I Nitrosomonas
II Rhizobium
III Anabaena
IV Spirulina
I and II
I and III
II and IV
III and IV
Which are true about light reaction in photosynthesis?
I and II
I and IV
II and III
III and IV
