In systematics, a group of organisms consisting of a common ancestor and some, but not all, of its descendents is defined as a
A. None of the answer choices is correct.
B. clade.
C. polyphyletic group.
D. cladogram.
E. paraphyletic group.
E. paraphyletic group.
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Regulation of cellular processes via chromatin remodeling or compaction are used by eukaryotic cells but not archaeal cells.
Answer the following statement true (T) or false (F)
Cystic fibrosis is a genetic disease that leads to the production of excessive, thick mucus in the respiratory tract, causing frequent and serious respiratory infections
The defect is due to the production of a faulty membrane protein for the transport of the chloride ion. The protein exists in membranes, but it doesn't function normally. Based on this scenario, what is occurring at the molecular level in a person with cystic fibrosis? A) A receptor protein is being adversely affected. B) A carrier protein is being adversely affected. C) Protein filaments in the cytoplasm are being adversely affected. D) A recognition protein is being adversely affected. E) A channel protein is being adversely affected.
Denaturation of protein X yields two subunits, A (MW 8,000) and B (MW 20,000). In order to understand the quaternary structure, a crosslinking experiment was performed with cell extracts
Analysis of the crosslinking products by SDS-PAGE showed four bands of the following molecular weights: 7,800, 19,500, 39,000, and 48,000 . This data suggests that protein X functions in vivo as: A. a dimer. B. a trimer. C. a tetramer. D The results are inconclusive.
In sponges, spicules are secreted by ____
a. amoeboid cells b. choanocytes c. sperm cells d. porocytes e. pinacoderm