Many diseases caused by bacteria can be treated and cured by using

A. antiseptics

B. antibiotics

C. antigens

D. antibodies

To avoid over fishing in a lake, the following measures may be helpful except

A. limiting fishing periods

B. regulating the size of nets

C. fishing throughout the year

D. fish breeding exercise

Conservation may be promote by

A. encouraging tree planting

B. systematic deforestation

C. overgrazing of pastures

D. unabated bush timing

Which of the following substances is not recycled in an ecosystem?

A. Carbon

B. Energy

C. Water

D. Nitrogen

Which of the following statements about phenylthiocarbamide (PTC) is not correct?

A. Some people BHG the taste of PTC to be bitter

B. Others find this substance to be tasteless

C. Ability to taste this chemical is inheritable

D. Ability to taste the chemical is hot inheritable

Which of the following characters is not an example of discontinuous variation?

A. Skin color

B. Fingerprint

C. Ability to roll tongue

D. Sex type

Which of the following human traits in a class of school children may give an approximate normal distribution curve when the variation is plotted?

A. Blood groups

B. Ear shapes

C. Sex distribution

D. Heights

The observable characteristics of an individual usually resulting from the interaction between the gene composition and the environment is referred to as

A. allele

B. genotype

C. phenotype

D. chromosome

The sudden change in a gene structure or chromosome number in an organism likely to cause an inheritable change in the phenotype is known as

A. migration

B. mutation

C. mitosis

D. meiosis

The effective cells involved in sickle-cell anaemia disease are

A. phagocytes

B. lymphocytes

C. erythrocytes

D. thrombocytes