Normal cell division in the body depends on a precisely regulated set of events that determine when a cell will divide. two specific genes, proto-oncogenes and tumor-suppressor genes, are responsible for cell cycle regulation. when mutated, proto-oncogenes can become what scientists call stimulating excessive cell division. a. cytogenes b. oncogenes c. tumor genes d. anti-suppressor genes

Identify the type of energy used in each action. the flexing of an arm muscle: a signal transduction process by a neuron: a ball at the top of a hill: 1. electrical energy 2. mechanical energy 3. gravitational potential energy

Based on the observation that only male crickets produce a song, you hypothesize that a male's song is a form of communication to potential mates. you set up a simple experiment to test this hypothesis. in the laboratory, you place a male snowy tree cricket in enclosure a, which is adjacent to enclosureb. in enclosure b, you place other insects, one at a time, and observe their responses to the male's song. the enclosures are designed so that the two insects being tested cannot see or smell each other, but sound is transmitted from enclosure a to enclosureb.

The human body needs energy in order to carry out life processes such as breathing. where does the body get this energy? a. from eating food b. from learning about new things c. from lying in the sun d. from sleeping