What evidence supports the theory of an early "RNA world"?
What will be an ideal response?
An RNA world suggests that there was a time when RNA both stored genetic information and functioned like an enzyme in protein synthesis.
Evidence that support this theory include:
1 . The fact that some RNAs have enzymatic activity. They are called ribozymes. This includes rRNA in ribosomes that speeds formation of peptide bonds during protein synthesis and ribozymes that edit RNA in the nucleus by splicing out introns from newly formed RNA.
2 . There is also evidence that RNA can replicate itself and therefore pass on genetic information. Researchers have produced self-replicating ribozymes that copy themselves by assembling free nucleotides.
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The mucous sheet produced by the endostyle traps the microscopic food particles in the water. This sheet is located in the pharynx of what animal?
A. lancelet B. crinoid C. arrow worm D. acorn worm E. tunicate
Since skin is made up of several types of tissues and has a number of different functions, it is best classified as an organ
Indicate whether the statement is true or false
A sponge feeds itself by ________, drawing organisms along with water into itself for nourishment.
Fill in the blank(s) with the appropriate word(s).
All of the following processes can be activated by complement EXCEPT _______.
A. inflammation B. antibody production C. cytolysis D. opsonization E. None of these choices are correct.