Practice MCQ Questions and answers on Biology-GK

The liver and pancreas are both exocrine and endocrine glands; they are exocrine glands because they secrete products—bile and pancreatic juice—into the gastrointestinal tract through a series of ducts, and endocrine because they secrete other substances directly into the bloodstream.

Oxytocin causes emotional disturbance.

Haemophilia is a hereditary disease carried by females and expressed by males.

The sex of a baby is determined by two sex chromosomes inherited from both the genetic parents. A baby will normally inherit one sex chromosome from the mother and one from the father. A woman has two X chromosomes and thus gives either of her X chromosomes. The father has one X chromosome and one Y chromosome, can give either his X or Y chromosome. The egg (from the mother) already contains an X chromosome. Therefore the sex of a baby is determined by the X or Y chromosome of the sperm cell from the father.

In sexually reproducing organisms, the number of chromosomes in the body (somatic) cells typically is diploid (2n; a pair of each chromosome), twice the haploid (1n) number found in the sex cells, or gametes.

In 1910, T.H.Morgan proved the idea of W.S.Sutton that genes are located on chromosomes.

An allele is a variant form of a gene. Some genes have a variety of different forms, which are located at the same position, or genetic locus, on a chromosome.

Fruitfly has 8 chromosomes.

Uracil is present in RNA and binds to adenine whereas thymine is present in DNA and binds to adenine.

Gregor Johann Mendel worked on Garden pea.