Which best describes a "myofibril"?
A. It is a single skeletal-muscle cell.
B. It is a cylindrical cellular organelle composed of myofilaments.
C. It is a hollow membranous structure that stores calcium.
D. It is composed of a single type of protein and forms cross-bridges.
E. It is a fibrous junction between a muscle cell and a tendon.
B
You might also like to view...
________ can be caused by alterations in receptors or by problems with G protein or second messenger pathways.
Fill in the blank(s) with the appropriate word(s).
During transcription, a sequence of three nitrogenous bases along the new mRNA strand represents a(n) ________ that is complementary to the corresponding triplet along the gene.
A) triplet B) tRNA C) anticodon D) antitriplet E) codon
Days 15-28 of the uterine (menstrual) cycle are known as ________
A) the menstrual phase B) the secretory phase C) menses D) the proliferative phase E) implantation
Olfactory axons pass through the bony __________ plate on their way to the olfactory bulb.
Fill in the blank(s) with the appropriate word(s).