13. What happens within the sarcomere to make a muscle contract? Draw and use the following: actin, myosin, crossbridge, calcium, troponin, and tropomyosin. How does that relate to the phrase "sliding
filament theory?"

Give the biological term for: structures that display characteristics of living organisms only within living cells

The influenza virus cause the flu, but not other diseases. why?

Suppose you have monohybrid pea plants in your garden and find that they produce round seed to wrinkled seeds in the ratio of 3: 1. if the allele are designated (r & r) receptively. what is the probable genotypes of the round seeds which produced f 1 ? rr & rr rr only rr & rr rr only rr only