ZIMSEC A Level Biology Paper 1 Past Papers

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Transport and Gas Exchange DNA and Molecular Genetics Inheritance and VariationclassificationecologyreproductionCell Structure and MembranesphotosynthesisEnzymes Biological Molecules

Explained questions

The diagram shows the fluid mosaic model of a membrane.
Where in an animal cell is alcohol detoxified?
The following diagrams show the main steps involved in measuring the width of a leaf at the midrib region using a light microscope.
Which of the following properties of water allows homoiotherms to adapt to a range of environments?
The diagram represents a disaccharide.
What is the theoretical number of different dipeptides that can be made using 20 different amino acids?
What is the temperature co-efficient of most enzyme-controlled reactions?
The diagram illustrates enzyme action.
In what ways do polyribosomes make protein synthesis efficient?
Which of the following enzymes protect bacteria from foreign DNA?
The diagram illustrates complementary base pairing in a segment of DNA, where the small rectangles represent pyrimidines and large rectangles represent purines.
Which of the following groups of structures would be clearly seen in a well stained onion epidermal cell under the light microscope at ×400 magnification?
What property of phospholipids makes them ideal in membrane architecture?
On an electron micrograph whose magnification is ×9600, a nucleus measures 58 mm. What is the actual size of the nucleus in μm?
A triglyceride has
Which orientation is likely to favour hydrogen bond formation between water molecules?
The diagram illustrates the buffering effect of an amino acid at pH 5.6.
The following diagram shows a single DNA strand.
Bacteria were grown for several generations in a medium containing ¹⁵N. Some of the resulting bacteria were then grown in ¹⁴N for one generation. Which test tube shows the position of first generation DNA in the density gradient?
A fresh leaf was homogenised and the suspension subjected to differential centrifugation. The procedure is shown in the flow chart below.
The diagrams show cells obtained from different organs.
Which feature in microscopy enables specimens to be viewed in detail?
Which properties explain the role of water in synovial fluid and amnion of a mammal?
Which property of lipids correctly matches its biological function?
What is the function of glycoproteins in cell membranes?
Which statement, about resolution, is not true?
In a calibrated eyepiece graticule, a single division measures 2.5μm.
The diagram shows the structure of a biological molecule.
The table gives a comparison of the light microscope and the electron microscope.
A secretory cell was supplied with radioactively labelled amino acids.

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