Viroids differ from viruses in having;

1.	DNA molecules without protein coat
2.	RNA molecules with protein coat
3.	RNA molecules without protein coat
4.	DNA molecules with protein coat

MALT constitutes about _______ percent of the lymphoid tissue in the human body.

Which of the following is correctly matched for the product produced by them?

1. Methanobacterium: Lactic acid

2. Penicillium notatum: Acetic acid

3. Saccharomyces cerevisiae: Ethanol

4. Acetobacter aceti: Antibiotics

Which, among the following, are the smallest living cells, known without a definite cell wall, pathogenic to plants as well as animals and can survive without oxygen?

Which of the following represents order of Horse’?

1. Perissodactyla

2. Caballus

3. Ferus

4. Equidae

Frog’s heart when taken out of the body continues to beat for some time. 
Select the best option from the following statements. 
(a) Frog is a poikilotherm. 
(b) Frog does not have any coronary circulation. 
(c) Heart is "myogenic" in nature 
(d) Heart is autoexcitable

1. Only (d)

2. (a) and (b)

3. (c) and (d)

4. Only (c)

Homozygous pure lines in cattle can be obtained by:

1. Mating of unrelated individuals of same breed.

2. Mating of individuals of different breed.

3. Mating of individuals of different species.

4. Mating of related individuals of same breed.

Identify the wrong statement in the context of heartwood:

1. It is highly durable

2. It conducts water and minerals efficiently

3. It comprises dead elements with highly lignified walls

4. Organic compounds are deposited in it

Anaphase Promoting Complex (APC) is protein degradation machinery necessary for proper mitosis of animal cells. If APC is defective in a human cell, which of the following is expected to occur?

1. Chromosomes will be fragmented

2. Chromosomes will not segregate

3. Recombination of chromosome arms will occur

4. Chromosomes will not condense

Which of the following cell organelles is responsible for extracting energy from carbohydrates to form ATP?
1. Ribosome
2. Chloroplast
3. Mitochondrion
4. Lysosome