In mammals, which blood vessel would normally carry the largest amount of urea?

Pick out the correct statements:
(a) Haemophilia is a sex-linked recessive disease
(b) Down’s syndrome is due to aneuploidy.
(c) Phenylketonuria is an autosomal recessive gene disorder.
(d) Sickle cell anaemia is an X – linked recessive gene disorder.

Which of the following guards the opening of the hepatopancreatic duct into the duodenum?

Microtubules are the constituents of:

The coconut water from tender coconut represents:

Tricarpellary, syncarpous gynoecium is found in flowers of:

Which of the following is not a stem modification?

The taq polymerase enzyme is obtained from:

Stems modified into flat green organs performing the functions of leaves are known as:

In higher vertebrates, the immune system can distinguish self cells and non-self. If this property is lost due to genetic abnormality and it attacks self-cells, then it leads to: