Read the following statements regarding ribosomes: (A) They were first observed under the electron microscope as dense particles by George Palade. (B) They are composed of structural RNAs and about 80 different proteins. (C) They are bounded by a single membrane in eukaryotic cells. (D) The smaller subunit of a eukaryotic ribosome is 30S. How many of the above statements are correct?

Step-by-step solution

Statement (A) is correct as ribosomes were first observed by George Palade (1953). Statement (B) is correct as a ribosome consists of structural RNAs and approximately 80 different proteins. Statement (C) is incorrect because ribosomes are non-membrane bound organelles found in both prokaryotic and eukaryotic cells. Statement (D) is incorrect because eukaryotic ribosomes are 80S, which consist of a larger 60S subunit and a smaller 40S subunit. The 30S subunit is the smaller subunit of prokaryotic (70S) ribosomes. T