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. bone; adipose:Bone is the most solid connective tissue, providing structural support and protection. Adipose tissue, while soft and pliable, is not the most fluid connective tissue since it primarily stores fat rather than circulating or transporting substances.
B. bone; blood:Bone is the densest and most rigid connective tissue, providing support, protection, and leverage for movement. Blood is the most fluid connective tissue, circulating throughout the body to transport nutrients, gases, hormones, and waste products.
C. hyaline cartilage; areolar:Hyaline cartilage is firm but not as rigid as bone, and areolar connective tissue is loose and supportive but not fluid; it serves as a cushioning and binding tissue rather than a circulating medium.
D. fibrocartilage; areolar:Fibrocartilage is tough and less compressible than hyaline cartilage but is still less solid and rigid than bone. Areolartissue is a viscous, gel-like matrix that is not the most fluid type.
Correct Answer is B
Explanation
A. metaphase plate:The metaphase plate is the imaginary plane in the middle of the cell where chromosomes align during metaphase. It does not involve actin filaments or the separation of daughter cells.
B. cleavage furrow:The cleavage furrow is formed by a contractile ring of actin filaments that tightens to constrict the cell membrane. This process physically separates the cytoplasm, resulting in two distinct daughter cells during cytokinesis.
C. mitotic spindle:The mitotic spindle is composed of microtubules that attach to chromosomes and move them during mitosis. It functions in chromosome segregation, not in the physical pinching of the cytoplasm.
D. centrosome:The centrosome is the microtubule-organizing center that helps form the mitotic spindle. While crucial in mitosis, it does not participate in the contraction needed for cell cleavage.
E. centromere:The centromere is the region where sister chromatids are attached and where spindle fibers connect during chromosome separation. It plays no role in the actin-driven division of the cytoplasm.
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