Purine and pyrimidine metabolism results in production of____________?
A. Creatinine
B. Trimethyamine oxide
C. Xanthine
D. None of these
Biology Mcqs
Which of the following statement about conifers is correct?
Which of the following statement about conifers is correct?
A. Stored excretory products in vacuoles, at a concentration that leads to crystal formation.
B. Accumulate waste in leaves, which fall in autumn.
C. Production of black wood in the center.
D. Excrete some of the waste materials directly into soil, occasionally using them as a chemical weapon against other competing plants.
Which excretory product in produced in plants during autotrophic mode of life?
Which excretory product in produced in plants during autotrophic mode of life?
A. CO2
B. H2O
C. O2
D. Both A and B
Which of the following marine fishes are considered direct descendents of fresh water ancestors?
Which of the following marine fishes are considered direct descendents of fresh water ancestors?
A. Hagfish
B. Jelly Fish
C. Star Fish
D. Bony fishes
Most of the marine invertebrates are__________?
Most of the marine invertebrates are__________?
A. Osmoconformers
B. Osmoregulators
C. Both depend upon the concentration of sea water
D. None of these
Which of the following represents osmoregulatory steps taken by hydrophytes?
Which of the following represents osmoregulatory steps taken by hydrophytes?
A. Increases transpiration by increasing the surface area of the leave.
B. Small and thick leaves to decrease the surface area proportional to the volume of the leave.
C. Stomata closing in sufficient supply, and opening in restricted supply of water.
D. None of these
The mechanism of regulation, generally between organism and its environment, of solutes and the gain and the loss of water is called________?
The mechanism of regulation, generally between organism and its environment, of solutes and the gain and the loss of water is called________?
A. Homeostasis
B. Hemostasis
C. Osmoregualtion
D. Thermoregulation
Fishes, most of the invertebrates and amphibians are examples of ________ animals?
Fishes, most of the invertebrates and amphibians are examples of ________ animals?
A. Endotherms
B. Ectotherms
C. Heterotherms
D. Homeotherms
Formation of heat shock proteins in plants results in___________?
Formation of heat shock proteins in plants results in___________?
A. Elevation of temperature in cold conditions.
B. Embracing the enzymes and other proteins and prevent their denaturation.
C. Change the chemical nature of other proteins thus making them heat resistant.
D. Help in evaporative cooling.
Panting is a representative of which mechanism?
Panting is a representative of which mechanism?
A. Pigmentation.
B. Respiration.
C. Evaporative cooling.
D. Excretion.