객관식
Which set lists the four nitrogenous bases found in RNA?
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7. DNA and Chromosome Structure
RNA
객관식
Which of the following cellular structures contains RNA but not DNA under typical eukaryotic cell conditions?
A
Nucleus
B
Chromosomes
C
Ribosomes
D
Mitochondria
검증된 단계별 안내1
Step 1: Understand the typical nucleic acid content of each cellular structure listed. The nucleus and chromosomes primarily contain DNA, as chromosomes are DNA-protein complexes located inside the nucleus.
Step 2: Recall that mitochondria contain their own DNA and RNA, as they have their own genome and machinery for protein synthesis.
Step 3: Recognize that ribosomes are cellular structures responsible for protein synthesis and are composed mainly of ribosomal RNA (rRNA) and proteins, but they do not contain DNA.
Step 4: Compare the options and identify which structure contains RNA but lacks DNA under normal eukaryotic cell conditions. Ribosomes fit this description because they have RNA but no DNA.
Step 5: Conclude that the correct answer is ribosomes, as they contain RNA but not DNA, unlike the nucleus, chromosomes, and mitochondria.
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