What molecule is shown here?(The entire model)
DNA
RNA
Protein
Transfer RNA (tRNA)
The Correct Answer is B
A. DNA: DNA contains the bases adenine (A), thymine (T), cytosine (C), and guanine (G). The presence of uracil (U) in the model rules out DNA, since uracil is unique to RNA.
B. RNA: The model shows nucleotides labeled G (guanine), U (uracil), and C (cytosine), which are components of RNA. The entire structure represents a strand of RNA being synthesized or processed.
C. Protein: Proteins are composed of amino acids, not nucleotide bases. The colored blocks labeled with letters (G, U, C) clearly indicate nucleotides, not amino acids.
D. Transfer RNA (tRNA): While tRNA is a type of RNA, the model depicts a linear strand of RNA bases rather than the folded cloverleaf structure characteristic of tRNA.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. Basal Cell Carcinoma: This is the most common and least likely to spread (metastasis). It typically appears as a pearly or waxy bump, unlike the pigmented, irregular lesions shown.
B. Squamous Cell Carcinoma: While more aggressive than basal cell, it is usually less dangerous than melanoma. It often presents as a firm, red nodule or a flat lesion with a scaly surface.
C. Melanoma: This is the most severe and deadly form of skin cancer because it is highly likely to spread to other organs. The image displays the classic warning signs: Asymmetry, irregular Borders, multiple Colors, large Diameter, and Evolving/Changing.
D. Actinic Keratosis: This is a precancerous skin growth caused by sun damage. It is not yet a malignant cancer, though it can develop into squamous cell carcinoma if left untreated.
Correct Answer is B
Explanation
A. Messenger RNA (mRNA): mRNA carries the genetic code from the DNA in the nucleus to the ribosome. It consists of a single linear strand of codons, rather than the "cloverleaf" shape seen here.
B. Transfer RNA (tRNA): This molecule is responsible for bringing the correct amino acid to the ribosome during translation. Its structure features an anticodon at one end to pair with an mRNA codon and an amino acid attachment site at the other.
C. Ribosomal RNA (rRNA): rRNA is a structural component of ribosomes. While it is made of RNA, it does not function as an adapter molecule carrying specific amino acids via an anticodon.
D. DNA Polymerase: This is an enzyme, not a nucleic acid. Its role is to synthesize new DNA strands during replication, not to transport amino acids during protein synthesis.
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