Brittle stars are members of the class ____ of the phylum Echinodermata
a. Asteroidea
b. Ophiuroidea
c. Echinoidea
d. Holothuroidea
e. Crinoidea.
B
Biology & Microbiology
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In muscle function at the sarcomere level, the binding of ___ ions to ____ regulates the formation of cross-bridges.
A. calcium, troponin B. calcium, tropomyosin C. calcium, myosin D. sodium, troponin E. sodium, tropomyosin
Biology & Microbiology
DNA replication occurs during the __________ of the cell cycle
a. S phase b. G1 phase c. G2 phase d. interphase
Biology & Microbiology
The layered membranes that jacket the central nervous system are the
A. gray matter. B. meninges. C. white matter. D. epidermis. E. myelin sheaths.
Biology & Microbiology
Explain why the use of iPS cells for stem cell therapies may be a desirable alternative to the use of either embryonic
stem cells or adult stem cells. What will be an ideal response?
Biology & Microbiology