Muscles can carry out their unique motor function because they are the only cells that contain actin and myosin.
Answer the following statement true (T) or false (F)
False
Other cell types do contain actin and myosin as well, which they use for intracellular transport, but not in the large quantities and layered organization seen in muscle cells.
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Upon finding a carcass, a raven will only call and attract other ravens to the food source if the ____
a. nearby ravens are relatives b. food source is large and plentiful c. food is found in a resident pair's territory d. food is found in his own territory e. food is being consumed by an animal of another species
Gibbons are able to swing through the trees by
their arms thanks to ___ joints.
a. fibrous b. cartilaginous c. synovial d. hinged joints e. gliding joints
In vertebrates, the family of myogenic regulatory factors (MRFs) plays a major role in muscle development. This family consists of four related genes that have distinct but overlapping functions. This gene family is represented by only a single gene in Drosophila, called nautilus. You want to know whether nautilus plays a role like all of the MRFs put together, or more like one in particular. What is a quick and easy way to begin to address this question?
A. Use a DNA microarray to compare gene activation patterns between nautilus and the MRFs. B. Compare the proteome of a cell expressing nautilus to the those of cells expressing each of the MRFs in turn. C. Generate four transgenic Drosophila strains that express the MRFs in a mutant nautilus background. D. Compare the DNA and protein sequences of all the genes to determine if nautilus is more similar to one MRF than another.
The most abundant molecule in the cell is:
A) carbohydrate. B) lipid. C) nucleic acid. D) water. E) protein.