Lecture 1 Unit 1

Question 1

what is a hypothesis

Answer 1

a testable question developed by a scientist based on a series of observations

Question 2

what is a theory

Answer 2

an explanatory idea that is broad in scope and supported by the results from many experiments designed to test hypotheses

Question 3

what is a scientific law

Answer 3

a theory that has withstood repeated testing and is accepted as being true in all cases

Question 4

what is the 1st law of thermodynamics

Answer 4

energy cannot be created or destroyed, in can only be transformed from one form to another

Question 5

what is the 2nd law of thermodynaics

Answer 5

the degree of disorder in the universe tends to increase

Question 6

what is the function of the plasma membrane

Answer 6

surrounds the cell and controls the exchange of material with the nonliving environment

Question 7

what cells have a nucleus? which don’t?

Answer 7

eukaryotes have a nucleus. prokaryotes dont

Question 8

what do branches represent in a tree of life

Answer 8

evolutionary distance

Question 9

what do nodes represent

Answer 9

living ancestors of species at the tips