Which of the following is TRUE? A. Skeletal muscle fibers contain sarcomeres; smooth muscle fibers do not. B. Skeletal muscle cells have one nucleus, but smooth muscle cells are multinucleated. C. Skeletal muscle lacks the coarse connective tissue sheaths that are found in smooth muscle. D. Skeletal muscle fibers tend to be shorter than smooth muscle fibers.

Which of these is not a function of some membrane proteins ? a. allowing polar molecules to enter the cell b. recognizing other types of cells c. receiving messeges from other cells b. carrying messages to oher cells

The diagram shows a fossil of an ancient whale skull and a skull of a present-day whale. the ancient whale is extinct and is believed to be an ancestor of the present-day whale. what do these skulls most likely show that supports darwin’s theory of evolution? all populations can adapt and survive. only some organisms have a common ancestor. populations change slowly over time. populations rapidly become extinct.

Yeast cells reproduce quickly by budding. this is a form of reproduction so all the yeast cells a) sexual; vary b) asexual; vary c) asexual; are identical d) sexual; differ from the parents submit hint structures and functions of cells cellular reproduction