Which best describes a pilus?

A. A tube that extends from a bacterium

B. A piece of DNA transferred by a virus

C. A virus that causes a common cold

D. A protective shell around a bacterium

What provides instructions to cells in forming an organ?

What force is mostly responsible for tides? Select one: a. the gravity of the Sun b. the gravity of Earth c. the gravity of the Moon d. wind

Which statement best describes why a machine is useful? A machine does a greater amount of work than the amount of work that is done on it. Amachine does a smaller amount of work than the amount of work that is done on it.

If you have the frequency of the recessive allele for a gene, how do you get the frequency of the dominant allele?

How would being able to bring water into the gills when the mouth is closed benefit a bottom-dwelling shark or ray?

Where is a proton located in the atom?

List the ways in which tadpoles turn to frogs

How do oxbow lakes form

When alzheimer disease appears in middle age rather than old age, it: a. progresses more slowly. b. progresses more rapidly. c. causes death within a year. d. is benign?

What is the sequence of nursing actions to assess 4th degree perineal laceration?