What is the function of the protein titin?
A. It binds to myosin heads, enabling
shortening of the muscle fiber.
B. It attaches the myosin thick filament to the
Z disk at the end of the sarcomere.
C. It transports calcium into and out of the
cell.
D. It regulates contraction of muscle cells.
B
You might also like to view...
HIV inserts its genome into the host cell's DNA
Indicate whether the statement is true or false.
Linus Pauling demonstrated that:a
the structure of hemoglobin was altered by a mutation of a single gene. b. mutations only caused defects in enzymes. c. mutations alter the structure of RNA, but not proteins. d. mutations were inherited. e. the structure of hemoglobin was altered by mutations in any of a dozen genes.
External fibrous layer
What will be an ideal response?
Which of the following cells would most likely hav the greatest concentration of densely packed rough endoplasmic reticulum?
A. An amoeba engulfing small ciliates B. A bioluminescent bacterial cell C. A pancreatic cell engaged in the production of digestive enzymes D. A functional phloem cell at maturity E. An epithelial cell whose DNA is replicating before mitosis