9700_w24_qp_11
A paper of Biology, 9700
Questions:
40
Year:
2024
Paper:
1
Variant:
1
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5
The statements describe processes that take place in a secretory cell. Modification of the protein occurs in the Golgi body. mRNA leaves the nucleus. Ribosomes bind to mRNA during translation. Transcription of a specific DNA sequence occurs. Vesicles fuse with the cell surface membrane. Vesicles transport the protein to the Golgi body. Statement 4 is the first process, and statement 5 is the last process. What is the correct sequence of the middle four processes?
6. Nucleic acids and protein synthesis  →  6.2. Protein synthesis
4. Cell membranes and transport  →  4.2. Movement into and out of cells
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9
The diagram shows how the alternating nature of -glucose monomers along a chain allows hydrogen bonds to form between consecutive monomers. C3 O O C2 C5 O C4 HO C6 C1 HO HO OH C5 C6 O C2 C3 O C4 HO OH C1 key = hydrogen bond Hydrogen bonds in cellulose affect the tensile strength (the ability to withstand pulling forces without breaking). How do the hydrogen bonds shown...
2. Biological molecules  →  2.2. Carbohydrates and lipids
7. Transport in plants  →  7.2. Transport mechanisms
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12
A student carried out investigations at pH 1–8 to look at the effect of pH on an enzyme-catalysed reaction. The optimum condition for this enzyme is the acidic environment of the stomach at pH 1–2. The remaining substrate concentration was measured after five minutes at each different pH. Which graph shows the effect of increasing pH on substrate concentration remaining after five minutes?
3. Enzymes  →  3.2. Factors that affect enzyme action
3. Enzymes  →  3.1. Mode of action of enzymes
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14
Pyrophosphatase enzymes catalyse a hydrolysis reaction. pyrophosphate ions substrate phosphate ions product pyrophosphatase In experiment 1, a scientist studied the rate of this reaction, using a colorimeter. The absorbance of the solution was measured at regular intervals until all of the pyrophosphate ions had been converted into phosphate ions. In experiment 2, the scientist repeated the procedure with a higher concentration of pyrophosphatase. All other variables were standardised. Which graph shows the effect of increasing the concentration of pyrophosphatase?
3. Enzymes  →  3.2. Factors that affect enzyme action
13. Photosynthesis  →  13.2. Investigation of limiting factors
3. Enzymes  →  3.1. Mode of action of enzymes
Open
19
An investigation was carried out into the effect of four different treatments on the permeability of the cell surface membranes and tonoplasts of beetroot cells. Beetroot cell vacuoles contain a red pigment. This pigment cannot diffuse through the tonoplasts or cell surface membranes. 1 cm3 cubes were cut from beetroot tissue and washed in running water for 20 minutes to remove any pigment released from damaged cells. Two cubes were then placed in each of the four test-tubes containing different contents and observed for five minutes. Which row shows a correct explanation for the observation recorded for one of the treatments?
4. Cell membranes and transport  →  4.2. Movement into and out of cells
4. Cell membranes and transport  →  4.1. Fluid mosaic membranes
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