Which of the following statements is true with respect to myosin?
A)Plants,fungi,and animals share the same myosin families.
B)Myosin is found in all prokaryotes and eukaryotes.
C)Different classes of myosins are distinguished by differences in structural organization and amino acid sequence.
D)Cardiac α-myosin allows for greater contractile efficiency.

Question

Quizplus · Accepted Answer

Different classes of myosins are distinguished by differences in structural organization and amino acid sequence. While myosin is found in most eukaryotes, including plants and animals, it is not found in prokaryotes. Additionally, different myosin families have evolved in different lineages, so not all organisms share the same myosin families. The statement about cardiac α-myosin is not true because while it may be important for cardiac muscle function, it does not necessarily allow for greater contractile efficiency compared to other myosin isoforms.

Which of the Following Statements Is True with Respect to Myosin