Aastha Chokshi
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Hydrophobic

Hydrophobic is water “hating.” Lipids are hydrophobic and they turn away from water. When oil is placed in water, it forms a bubble, where the hydrophilic glycerol heads face the outside of the bubble and the hydrophobic fatty acid tails form the inside of the bubble.

Posted by Guest  On Aug 23, 2011 at 1:25 PM
  
Pollen 
Pollen

Pollen is found on the stamen of flowers. Pollen produces the male gametes of the plant. Pollen is carried by pollinators to a pistil, the female part of the flower. The sperm and the egg fertilize and produce a seed.

Posted by Guest  On Aug 23, 2011 at 1:23 PM
  
Dominant vs. Recessive Trait

This photograph shows a person with a dimple. Having dimples is a dominant trait. A person who has a dimple can either by homogenous (DD) or a hybrid (Dd). A person who doesn’t have a dimple must have two of the recessive alleles (dd). Some traits, such as hair type, show incomplete dominance in which the hybrid version shows a blend of the dominant and recessive phenotypes. Codominance is when both alleles are equally dominant and thus the phenotype shows a mixture where both traits are equally visible. An example of codominance is blood type AB.

Posted by Guest  On Aug 23, 2011 at 1:21 PM
  
Detritivores

Detritivores are heterotrophs that obtain energy by feeding on detritus. Detritus is decomposing organic matter. They are major contributors to the ecosystem in which they belong, whether it is marine or terrestrial. Examples of detritivores include millipedes, woodlice, dung flies, slugs, and many terrestrial worms (as shown in this photograph).

Posted by Guest  On Aug 23, 2011 at 1:16 PM
  
Lipid 
Lipid

Lipids are organic compounds that are greatly diverse in their structure and properties. Lipids constitute of fatty acids (triglycerides), waxes, sterols as well as phospholipids. The photograph shows a picture of olive oil, an unsaturated triglyceride. Fatty acids are hydrophobic in nature. For example, the phospholipids, with a hydrophilic head and two hydrophobic tails, form a lipid bilayer in the cell membrane. 

Posted by Guest  On Aug 23, 2011 at 1:11 PM
  
Homeostasis

Water is a necessary element needed to maintain homeostasis. Water aids in chemical reactions as well as in maintaining the conditions necessary for chemical reactions to occur. For example, it controls the temperature and pH in a cell. The animal in the photograph is drinking water, a necessary action to maintain homeostasis.

Posted by Guest  On Aug 23, 2011 at 1:09 PM
  
Commensalism

Commensalism is a type of interaction between two organisms in which one organism benefits while the other is not affected. The cow in the photograph has insects on its body. Birds, such as cattle egrets, which feed on insects, can easily find their meal by following cows as well as other cattle. 

Posted by Guest  On Aug 23, 2011 at 1:06 PM
  
Archaebacteria

Archaebacteria are a group of prokaryotic organisms that live in extremely harsh conditions. They are different from Eubacteria because of the following reasons:

  • They are mostly anaerobic
  • The RNA of their ribosomes is different to that of Eubacteria.
  • They have no peptidoglycan in their cell walls
  • Their fats are linked together in a different way

They can be found in marshes, such as one shown in the photograph.

Posted by Guest  On Aug 23, 2011 at 1:03 PM
  
Biological Magnification

Biological magnification is when certain toxins accumulate as they move up the food chain. The amount of toxins increases as they move up the food chain, from producers to tertiary consumers. The photograph shows a bird catching a fish. In this particular food chain, if a toxin has been accumulated in the fish, the amount of toxins found in the bird would be higher than the amount found in the fish. 

One incident was when DDT, a pesticide, was found in high levels among bald eagles due to biological magnification. This had led to extreme population declines among bald eagles.
Posted by Guest  On Aug 23, 2011 at 1:00 PM
  
Exoskeleton

An exoskeleton is hard encasement deposited on the surface of an animal. The cuticle is a jointed exoskeleton of the arthropods. The cuticle can be flexible or hard depending on the function of the cuticle at that location. As the animal grows, it enlarges the shell by adding to its outer edge. During growth spurts, however, the arthropod must shed its exoskeleton and make a larger one.

Posted by Guest  On Aug 23, 2011 at 12:03 PM
  
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