Organisms called Methanogens are most abundant in a 

• cattle yard

• polluted stream

• hot spring

• hot spring

Which of the following enzymes carries out initial step in the digestion of milk in humans?

• Rennin

• Lipase

• Trypsin

• Trypsin

The purplish red pigment rhodopsin contained in the rods type of photoreceptor cells of the human eyes is a derivative of 

• Vitamin -C 

• Vitamin -D 

• Vitamin - A 

• Vitamin - A 

14.

Continuous addition of sugars in 'fed-batch' fermentation is done to

• obtain antibiotics 

• purify enzymes

• degrade sewage

• degrade sewage

What would be the number of chromosomes of the aleurone cells of a plant with 42 chromosomes in its root tip cells? 

• 63

• 84

• 21

• 21

Which one of the following plasma proteins is involved in the coagulation of blood? 

• Serum amylase

• A globulin

• Fibrinogen 

• Fibrinogen 

Important  site for formation of glycoproteins and glycolipids is

• Golgi apparatus 

• plastid

• lysosome

• lysosome

Which of the following are correct states as it happens in the common cockroach?

• Oxygen is transported by haemoglobin in blood 

• Nitrogenous excretory products is urea

• The food is ground by mandibles and gizzard

• The food is ground by mandibles and gizzard

Which one of the following correctly explains the function of a specific part of a human nephron?

• Henle's loop - most reabsorption of the major substances from the glomerular filtrate

• Distal convoluted - reabsorption of ion into the surrounding blood capillaries

• Afferent arteriole - carries the blood away from the glomerulus towards renal vein

• Afferent arteriole - carries the blood away from the glomerulus towards renal vein

Select the correct option with respect to mitosis

• Chromatids start endoplasmic 

• Golgi complex and endoplasmic reticulum are still visible at the end of prophase

• chromosomes move to the spindle equator and get aligned along equatorial plate in metaphase

• chromosomes move to the spindle equator and get aligned along equatorial plate in metaphase