81.

The Taq polymerase enzyme is obtained from

• Thiobacillus ferroxidans

• Bacillus subtilis

• Pseudomonas subtilis

• Pseudomonas subtilis

Which of the following most appropriately describes haemophilia?

• X-linked recessive gene disorder

• Chromosomal disorder

• Dominant gene disorder

• Dominant gene disorder

Which part of the tobacco plant is infected by Meloidogyne incognitia?

• Leaf

• Stem

• Root

• Root

Which of the following statements is not true for cancer cells in relation to mutations?

• Mutations destroy telomerase inhibitor

• Mutations inactivate the cell control

• Mutations inhibit production of telomerase

• Mutations inhibit production of telomerase

Fertilisation in humans is practically feasible only if

• the ovum and sperms are transported simultaneously to ampullary -isthmic junction of the fallopian tube

• the ovum and sperms are transported simultaneously to ampullary -isthmic junction of the cervix

• the sperm are transported into cervix within 48 hrs of releases of ovum in uterus

• the sperm are transported into cervix within 48 hrs of releases of ovum in uterus

Which of the following is the starter codon?

• UGA

• UAA

• UAG

• UAG

A river with an inflow of domestic sewage-rich in organic waste may result in

• increased population of aquatic food web organism

• an increased production of fish due to biodegradable nutrients

• death of fish due to lack of oxygen

• death of fish due to lack of oxygen

A system of rotating crops with legume or grass pasture to improve soil structure and fertility is called

• contour farming

• strip farming

• shifting agriculture

• shifting agriculture

Following are the two statements regarding the origin of life

I. The earliest organisms that appeared on the earth were non-green and presumably anaerobes.
II. The first autotrophic organisms were the chemoautotrophs that never released oxygen.

Of the above statement which one of the following options is correct?

• II is correct but I is false

• Both I and II are correct

• Both I and II are false

• Both I and II are false

Gause's principle of competitive exclusion states that

• Competition for the same resources excludes species having different food preferences

• No two species can occupy the same niche indefinitely for the same limiting resources

• Larger organisms exclude smaller ones through competition

• Larger organisms exclude smaller ones through competition