All 15 questions from the Post-UTME Screening (Post-UTME) Biology 2009 Objective paper, with the correct answer and a full explanation for each. Free, no signup needed.
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Which of the following best describes viruses?
Viruses are obligate intracellular parasites - they can only replicate inside a living host cell.
Loss of nitrogen in the soil is caused by a process known as
Denitrification converts soil nitrates back into atmospheric nitrogen gas, depleting soil nitrogen.
Which of the following represents the Watson-Crick DNA base pair model?
In the Watson-Crick model, Adenine pairs with Thymine (T-A), and Guanine pairs with Cytosine.
The liver performs all the following functions EXCEPT
The liver stores vitamins (e.g. vitamin A) rather than synthesizing them from scratch; it does regulate heat, form cholesterol, and (along with the spleen) remove old red blood cells.
On what part of the tongue do we perceive salty taste?
The traditional (though since revised) 'tongue map' places salty taste perception at the front and sides of the tongue.
Maintenance of homeostasis in mammals is a function of all the following EXCEPT
The ovaries are reproductive organs and are not directly involved in maintaining homeostasis, unlike the skin, lungs, and kidneys.
Biotechnology has helped to produce plants and animals of these desirable features, EXCEPT
Higher susceptibility to infection is an undesirable trait; biotechnology aims for the opposite (greater resistance).
Insects which undergo complete metamorphosis are those that
Complete metamorphosis involves four distinct stages: egg, larva, pupa, and adult.
The type of storage organ found in ginger is called
Ginger's underground storage organ is a rhizome.
The geotropic response of a seedling is detected with
A clinostat is used to study/eliminate the effect of gravity (geotropism) on plant growth.
The substrate in cellular respiration is
Glucose is the primary substrate broken down during cellular respiration.
A good example of roughage-containing food material is
Carrots (and other fibrous vegetables) are a good source of dietary roughage/fibre.
The World Health Organisation defines good health as
The WHO's classic definition of health includes physical, mental AND social well-being, not merely the absence of disease.
The stage at which chromosomes move towards opposite poles during mitosis is
Anaphase is the mitotic stage where sister chromatids separate and move to opposite poles.
Each month the uterus lining thickens up in readiness to receive the fertilized egg. If the egg is not fertilized, the lining and some blood is lost through the vagina. This is
This describes the process of menstruation.
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