The skin includes all of the following, EXCEPT the
reticular layer
hypodermis
dermis
epidermis
The Correct Answer is B
A. reticular layer: The reticular layer is the deeper part of the dermis, composed mainly of dense irregular connective tissue. It provides strength, elasticity, and houses structures such as glands, nerves, and blood vessels, making it part of the skin.
B. hypodermis: The hypodermis, also known as the subcutaneous layer, lies beneath the dermis and is made up of adipose and connective tissue. It anchors the skin to underlying structures but is not technically considered part of the skin itself.
C. dermis: The dermis is one of the two main layers of the skin, lying beneath the epidermis. It contains connective tissue, blood vessels, and sensory receptors that support and nourish the epidermis.
D. epidermis: The epidermis is the outermost layer of the skin made of keratinized stratified squamous epithelium. It provides a protective barrier against environmental damage, pathogens, and water loss.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. centromere:The centromere is the region of a chromosome where sister chromatids are tightly joined after DNA replication. It plays a critical role in ensuring proper alignment and separation of chromatids during cell division.
B. centrosome:The centrosome is an organelle that organizes microtubules and helps form the mitotic spindle during cell division. It is not responsible for holding sister chromatids together.
C. centriole:Centrioles are cylindrical structures within the centrosome that aid in spindle fiber formation. They assist in chromosome movement but do not act as the attachment site between sister chromatids.
D. kinetochore:The kinetochore is a protein complex assembled on the centromere that attaches to spindle fibers. It facilitates chromatid movement but is not the structure that holds sister chromatids together.
Correct Answer is A
Explanation
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.
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