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 A
Explanation
True:Vellus hair is soft, fine, and lightly pigmented, covering much of the body surface. It is most noticeable in children and adult females, where it serves a protective function without providing significant insulation.
Correct Answer is A
Explanation
A. glycogenesis:Glycogenesis is the process of converting glucose into glycogen for storage in the liver and muscles. When an endurance runner “carbo-loads,” she increases glycogen stores to provide a readily available energy source during prolonged exercise.
B. glycolysis:Glycolysis is the breakdown of glucose into pyruvate to produce ATP for immediate energy needs. It does not refer to storing glucose for future use, as occurs during carbo-loading.
C. gluconeogenesis:Gluconeogenesis is the formation of glucose from noncarbohydrate sources such as amino acids and glycerol, typically occurring during fasting or low-carbohydrate intake, not during carbohydrate loading.
D. glycogenolysis:Glycogenolysis is the breakdown of glycogen into glucose to supply energy during fasting or exercise, which is the opposite of the storage process during carbo-loading.
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