Mutations of keratins in the ________ that resist tensile forces in the skin cause the blistering disease known as epidermolysis bullosa simplex
A) intermediate filaments
B) microtubules
C) microfilaments
D) actin filaments
E) crescentin filaments
Answer: A
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Which of the phylogenetic trees above best demonstrates cladogenesis?
A. Tree 1
B. Tree 2
C. Tree 3
D. Both Tree 2 and Tree 3
Cytoskeletal elements are assembled from ____
a. proteins b. phospholipids c. glycogen d. nucleotides e. triglycerides
How does the body recognize "self" cells compared to "nonself" cells?
A. "Self" cells contain a triple layer of phospholipids on their plasma membranes. B. "Self" cells contain spikes on their outer surface. C. "Self" cells are marked by glycoproteins called major-histocompatibility complexes (MHCs). D. "Self" cells contain cytokines on their cell surfaces.
Competent cells are cells that
a. can take up DNA from their surrounding environment and integrate it into their own chromosomes by recombination. b. are also considered "rough-strain" based on colony phenotype. c. have the ability to produce capsules. d. are killed by heat.