The RNA responsible for bringing the amino acids to the ribosome for protein formation is
RNA
mRNA
SRNA
tRNA
The Correct Answer is D
A. RNA: RNA is a general term for ribonucleic acid and includes several types with different functions. It does not specifically refer to the RNA that delivers amino acids to the ribosome.
B. mRNA: Messenger RNA carries the genetic code from DNA to the ribosome, directing the sequence of amino acids in a protein, but it does not transport the amino acids themselves.
C. sRNA: Small RNA molecules (sRNA) are involved in regulatory processes within the cell, such as gene silencing, and are not responsible for delivering amino acids for protein synthesis.
D. tRNA: Transfer RNA is responsible for bringing specific amino acids to the ribosome during translation. Each tRNA recognizes codons on the mRNA and ensures that the correct amino acids are added to the growing polypeptide chain.
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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