Which tissue type is formed by many cells joining together, making it multinucleated?
cardiac MT
skeletal MT
dense regular CT
smooth MT
The Correct Answer is B
A. cardiac MT: Cardiac muscle tissue cells are uninucleated or occasionally binucleated. They connect via intercalated discs for synchronized contraction, but they do not fuse into multinucleated fibers.
B. skeletal MT: Skeletal muscle tissue is formed when many myoblasts fuse during development, creating long, cylindrical fibers with multiple nuclei. This multinucleated structure supports efficient protein synthesis for muscle contraction.
C. dense regular CT: Dense regular connective tissue consists of parallel bundles of collagen fibers with fibroblasts scattered between them. It is not multinucleated and functions primarily in providing tensile strength.
D. smooth MT: Smooth muscle tissue is composed of spindle-shaped cells, each with a single central nucleus. It does not form multinucleated fibers, and its contractions are involuntary and slower compared to skeletal muscle.
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Related Questions
Correct Answer is D
Explanation
A. basal cell carcinoma:Basal cell carcinoma is the most common type of skin cancer, typically arising from the basal cells in the epidermis. It grows slowly and rarely metastasizes, making it less deadly than other skin cancers.
B. squamous cell carcinoma:Squamous cell carcinoma originates from the keratinocytes of the epidermis. It is more aggressive than basal cell carcinoma but still has a relatively good prognosis with early treatment.
C. skin lymphoma:Skin lymphoma is a rare cancer affecting lymphocytes in the skin. While it can be serious, it is not the most deadly form of skin cancer compared to melanoma.
D. melanoma:Melanoma arises from melanocytes and is the least common type of skin cancer. It is highly aggressive and prone to metastasis, making it the most deadly form if not detected and treated early.
Correct Answer is D
Explanation
A. late prophase:During late prophase, chromosomes condense and the mitotic spindle forms, but cytokinesis has not yet begun as the cell is still preparing for chromosome alignment.
B. early anaphase:Early anaphase involves the separation of sister chromatids toward opposite poles. Cytokinesis does not start at this point because chromosome separation is still in progress.
C. early prophase:Early prophase is the initial stage of mitosis where chromatin condenses into visible chromosomes. Cytokinesis is not initiated at this stage.
D. late anaphase:Cytokinesis begins during late anaphase, when the cell starts forming a cleavage furrow as the chromosomes near the poles. This process continues into telophase, ultimately dividing the cytoplasm into two daughter cells.
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