Which of the following statements is correct regarding RNA?
rRNA is always attached to the rough ER.
If the base sequence of DNA is ATTGCA, the messenger RNA template will be UCCAGU.
Messenger RNA, transfer RNA, and ribosomal RNA play a role in protein synthesis.
There is exactly one specific type of mRNA for each amino acid.
The Correct Answer is C
A. rRNA is always attached to the rough ER: Ribosomal RNA is a structural component of ribosomes, which may be free in the cytoplasm or attached to the rough ER. It is not always bound to the rough ER, making this statement inaccurate.
B. If the base sequence of DNA is ATTGCA, the messenger RNA template will be UCCAGU: The correct complementary mRNA sequence would be UAACGU, where adenine pairs with uracil, thymine with adenine, and cytosine with guanine. The sequence given in the option does not follow base-pairing rules.
C. Messenger RNA, transfer RNA, and ribosomal RNA play a role in protein synthesis: All three RNA types are essential for protein synthesis. mRNA carries genetic information from DNA, tRNA delivers amino acids to the ribosome, and rRNA provides structural support and enzymatic activity within ribosomes.
D. There is exactly one specific type of mRNA for each amino acid: mRNA molecules carry codons that specify amino acids, but there is no one-to-one relationship between mRNA and amino acids. Multiple codons may code for the same amino acid due to the redundancy of the genetic code.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. TGCUU:RNA does not contain thymine (T); it contains uracil (U) instead. The presence of thymine makes this option incompatible with proper mRNA synthesis.
B. UGCAA:Complementary base pairing rules state that adenine (A) pairs with uracil (U) in RNA, cytosine (C) with guanine (G), guanine (G) with cytosine (C), thymine (T) with adenine (A), and thymine (T) with adenine (A).
C. ACGTT:This is identical to the DNA template strand and not complementary. The mRNA strand must be complementary to the DNA template strand, not a direct copy of it.
D. GUACC:This sequence does not match the base-pairing rules for the given DNA template. It represents a mismatch in complementary pairing, making it inaccurate for mRNA transcription.
Correct Answer is A
Explanation
A. Holocrine:Holocrine glands release their secretions by the disintegration of entire cells, which become part of the secretion. Sebaceous glands in the skin are an example, producing oily secretions that include cell fragments.
B. Merocrine:Merocrine glands secrete their products via exocytosis without the loss of cellular material. Sweat glands are an example, and their secretion does not contain disintegrated cells.
C. Mucous:Mucous glands primarily secrete mucus, a viscous fluid rich in glycoproteins, but this secretion is not composed of disintegrated cells.
D. Exocrine:Exocrine glands are a broad category of glands that secrete products onto epithelial surfaces through ducts. They include holocrine, merocrine, and apocrine types, so this term does not specifically indicate secretion by cell disintegration.
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