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Biological processes Questions & Detailed Answers 2024
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Biological processes Questions & Detailed Answers 2024
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2017- Biological processesWhich of the options, A to D, correctly describes how an endotherm would respond to an increase in
temperature?
A. dilation of arterioles near the surface of the skin
B. erector muscles contract, causing hairs to stand up
C. rapid contractions of skeletal muscles
D. sweat glands release less sweat - correct answerA
Which of the images, A to D, correctly summarises photosynthesis? - correct answerC
A student counted stomata on a leaf using a light microscope. The image magnification is ×60.Which of
the options, A to D, is the correct stomatal density of this leaf?
A. 7.50 stomata mm-2
B. 0.13 stomata mm-2
C. 2428 stomata mm-2
D. 0.21 stomata mm-2 - correct answerA
Which of the options, A to D, occurs in the nucleus of a cell?
A. synthesis of enzymes
B. synthesis of RNA
C. modification of polypeptides
D. synthesis of carbohydrates - correct answerB
During cell division, the chromosome number in the cells changes. The following sequences describe the
chromosome number in cells before, during and after different types of cell division.Which of the
options, A to D, correctly describes the stages of mitosis and meiosis in human cells?
A. 1 is mitosis, 2 is meiosis
B. 2 is mitosis, 3 is meiosis
C. 3 is mitosis, 4 is meiosis
, D. 4 is mitosis, 1 is meiosis - correct answerD
Patients with kidney failure can be treated in different ways. Which of the following statements describes
a feature of peritoneal dialysis?
1. Urea and mineral ions pass into the tissue fluid.
2. Blood is passed over an artificial membrane to remove toxins.
3. The patient receives immunosuppressant medication.
A. 1, 2 and 3
B. Only 1 and 2
C. Only 2 and 3
D. Only 1 - correct answerD
Bony fish absorb dissolved oxygen from the water using gills. Water is passed through the buccal cavity
and over the gill lamellae. The oxygen saturation of the blood and water changes as the water passes
over the gills. Which of the statements, A to D, correctly describes the way oxygen is transferred into the
blood at the gills?
A. Blood and water flow in a concurrent system with a constant concentration gradient between them.
B. Blood and water flow in a countercurrent system with a constant concentration gradient between
them.
C. Blood and water flow in a concurrent system with a greater concentration gradient between them at
the start of the gill lamella.
D. Blood and water flow in a countercurrent system with a greater concentration gradient between them
at the start of the gill lamella - correct answerB
RuBisCO is an enzyme that fixes carbon dioxide in photosynthesis. In some conditions, RuBisCO also
carries out oxygen fixation. The graph below shows how the carbon dioxide and oxygen fixing activities
of RuBisCO are affected by temperature. What are the correct percentage changes in RuBisCO carbon
dioxide and oxygen fixing activities between 30°C and 40°C?
A. carbon dioxide fixation -12.7%, oxygen fixation 23.3%
B. carbon dioxide fixation -14.6%, oxygen fixation 18.9%
C. carbon dioxide fixation -2.4%, oxygen fixation 54.2%
D. carbon dioxide fixation -3.6%, oxygen fixation 35.1% - correct answerC
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