Which of the following properties of DNA was discovered by James Watson and Francis Crick?

DNA is composed of four bases.

DNA looks like a long, twisted ladder.

DNA nucleotides always combine in the same pairs.

DNA has a doughnut shape when viewed using x-ray diffraction.

Emily works at a perfumery. she extracts 3 liters of essential oil for perfumes in 2 days. 1: assuming emily extracts essential oil at a constant rate, we can graph this relationship with time in days along the x-axis and quantity of oil in liters along the y-axis. the slope of the line representing this relationship is __ 2: a point on this line that corresponds to the amount of oil emily extracts after 5 days is (5,

Select the correct answer. how did agricultural advances affect chinese society during the middle ages? a. it led to population growth. b. it decreased life expectancy. c. it lowered industrial operations. d. it resulted in more people moving to rural areas.

Germany italy and japan formed the tripartite pact in part because they: a. hoped to convince the united states to stay out of world war ii b. share the ruling philosophies based on communist economics c. resented the agreements they were forced to sign at the munich conference d. believed their territories were threatened by aggressive foreign states