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Super Cooling - Temperature Relations in Animals
Super cooling is a phenomenon where body water is allowed to cool far below 0°C without formation of ice. Glycerol is effective in lowering both the freezing point and also the super cooling point. In addition, glycerol improves the tolerance to freezing in animals that tolerate ice formation. In some animals antifreeze compounds are found. For example in the Antarctic fish Trematomous borchgrevinki the blood contains a glycoprotein that acts as an antifreeze substance.
Parthenogenesis The diploid egg produced in the embryo sacs during diplospory and apospory develops into an embryo without fertilization, thus maintaining the sporophytic lev
Complement system is a chemical defense system which kills the microorganisms directly, it supplements inflammatory response, and works with, or complements, the immune system.
What are the functions of insulin and glucagon for the blood glucose control? Glucagon enhances glycemia and insulin reduces it. They are antagonistic pancreatic hormones. Gluc
Modalities Available for Sterilization The most accepted methods of sterilization can be classified as follows: Physical Agents: These comprise of: Sunlight Drying
Bilateral Cleavage In some animals (for example tunicates and nematodes, although in different way), the arrangement of 4 blastomeres after second cleavage is almost radially
Simple diffusion Only comparatively small uncharged or hydrophobic molecules (H2O, O2, and CO2, other gases, urea and ethanol) cross the lipid bilayer through simple
1. Many bacterial genes show adaptive regulation of their transcription. a) How is the lac operon regulated by the sigma factor? b) How is the lac operon regulated by lactose
Gregor Mendel's Law of Independent Segregation referred to which of the following genetic elements? A. Alleles of two genes that reside on the similar chromosome B. Alleles
Question 1 Describe any two possible mechanisms of mutagenesis 2 Explain any five functions of Endoplasmic reticulum 3 Write short note on Ames test 4 Describe the structure an
A diploid cell contains three pairs of homologous chromosomes designated C1 and C2, M1 and M2, and S1 and S2; no crossing over occurs. What possible combinations of chromosomes
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