Rna and proteins combine in cells to form structures called ribosomes. ribosomes contain the enzyme active site for peptide bond formation. based on their chemical structures, do you think protein or rna molecules actually form the active site within the ribosome?
a) it could be either, because both molecules have catalytic properties.
b) protein, because only proteins can catalyze a reaction that involves another protein
c) rna, because proteins cannot catalyze a reaction that involves another protein
d) protein, because rna cannot catalyze reactions

a) It could be either, because both molecules have catalytic properties.

Explanation:

Despite the majority of the existing enzymes (catalytic molecules) are from protein nature, there are some RNA molecules that possesses catalytic activities, they are called Ribozymes.

the right answer is a. skin cells forming from sunlight.

the liver is an organ endowed with a fantastic ability to regenerate

. thus, if a hepatectomy (ablation) of 70% of the hepatic mass is performed in the rat, there is complete recovery in 7 to 10 days.

prokaryotes are beings that have existed since the existence of life on earth, and do not come from another realm.

ribosomes are organelles that exist naturally in eukaryotes, either in free form or attached to the endoplasmic reticulum.

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the correct answer is option b

behavioral response need communication and thus co-ordination at several levels such as interaction among cells, organ system and the entire organism.

behavioral response produces both internal and environmental stimulus.