No endoplasmic reticulum (ER) would result in the cell's death.
There are two types of ER, rough and smooth.
Rough ER (RER) is studded with ribosomes and this is the site of protein synthesis. The RER is very important for proteins that are to be secreted - these proteins have a signal peptide (the first 5-10 amino acids) that gets processed inside the ER lumen - a signal peptidase removes the signal peptide and then this goes to the Golgi to be delivered. No RER - no proteins get secreted to the cell wall - so no transporters, etc. Not a happy cell.
The smooth ER functions in lipid biosynthesis and metabolism. It is also the site of steroid hormone production and detoxification. It is also the site of the initial glycosylation of proteins. If this doesn't happen, the protein doesn't function properly.
No ER = bad news for a eukaryotic cell!
The correct answer is c. Heterotrophs compete for the same food source.
As it can be seen from the image of the food web, the tree or plants which are autotrophs are consumed by various heterotrophs. Autotrophs provide as a source of food for several heterotrophs but several heterotrophs depend on other heterotrophs such as smaller insects or animals for their food. As shown in the food web, both frog and lizard are consumers of insects so both being heterotrophs are competing for the same source of food which is insect here.
Answer:
false....they are complex
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D!!
after the geological even the farthest layer down is the oldest
