A gene can best be defined as
a segment of DNA that carries the instructions for one protein
a strand of introns only
an RNA messenger that codes for a particular polypeptide
a three-base triplet that specifies a particular amino acid
The Correct Answer is A
A. a segment of DNA that carries the instructions for one protein: A gene is a functional unit of DNA that contains the necessary coding sequence to produce a specific protein. It includes exons, which code for amino acids, and regulatory regions that control expression.
B. a strand of introns only: Introns are non-coding segments within a gene that are removed during RNA processing. A gene is not composed solely of introns, as it also contains exons that determine protein structure.
C. an RNA messenger that codes for a particular polypeptide: Messenger RNA is the transcript produced from a gene. While it carries the code for a protein, the gene itself is the DNA sequence, not the RNA product.
D. a three-base triplet that specifies a particular amino acid: A three-base triplet is a codon in mRNA, which specifies a single amino acid during translation. A gene consists of many codons and encompasses the full sequence necessary for the entire protein.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. the subcutaneous layer, but no deeper:The subcutaneous layer lies beneath the dermis and contains fat and connective tissue. A cut reaching this layer would likely cause significant bleeding and deeper tissue pain, which does not match Anthony’s wound.
B. the papillary layer but not the reticular layer:The papillary layer is the upper portion of the dermis, just below the epidermis. Superficial cuts that are painful but not bleeding typically affect this layer, as it contains nerve endings that produce pain, but it is above the deeper reticular layer where larger blood vessels reside.
C. the stratum basale but not the dermal layers:The stratum basale is the deepest layer of the epidermis. While cuts affecting only this layer may cause mild discomfort, they rarely produce the type of superficial pain described, and they do not reach the dermis where more pain receptors are located.
D. the stratum corneum but not the stratum granulosum:The stratum corneum is the outermost layer of the epidermis and contains dead cells. A cut limited to this layer is usually painless and superficial, without causing noticeable pain.
Correct Answer is A
Explanation
A. ciliated simple columnar epithelium:The uterine (fallopian) tubes are lined with ciliated simple columnar epithelium. The cilia help move the ovum from the ovary toward the uterus, while secretory cells provide nourishment for the ovum and early embryo.
B. smooth MT:Smooth muscle tissue is present in the walls of the uterine tubes to aid peristaltic movement, but it does not line the lumen. The lining is provided by epithelial tissue, not muscle tissue.
C. simple cuboidal epithelium:Simple cuboidal cells are commonly found in glandular tissues and kidney tubules, where they function in secretion and absorption. They do not have the cilia required for egg transport in the uterine tubes.
D. stratified squamous epithelium:Stratified squamous epithelium is specialized for protection in areas exposed to friction, such as the skin and vaginal canal. It is not suitable for the transport and nourishment functions of the uterine tubes.
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