Consider these statements about the structural features of nucleic acids. Some are true only for DNA or RNA, some are true for both, and some do not fit either. Which of the following statements is true for DNA only?

a. It contains the pyrimidine uracil.
b. It contains a 2 hydroxy group.
c. It contains the sugar 2-deoxyribose.
d. Bases are attached to sugars in an α-N-glycosidic linkage.

Which of the following statements is true for both DNA and RNA?

a. In base composition, %A = %C always.
b. Sugars are connected with a 3-5' phosphodiester link.
c. In base composition, %G = %C.
d. Both can be hydrolyzed in alkaline solution

Describe the difference between a. a hypothesis and a theory and b. an observation and an experiment.

What is the most common reason for matter changing its state?

Many bird species build nests in which they raise their offspring. one of these species is known as the magnolia warbler. breeding pairs of magnolia warblers build nests out of pieces of grass and twigs. the female warbler will then lay her eggs in the nest and sit on the eggs for a few weeks until they hatch. after the offspring have hatched, the female will continue to sit on the newborn chicks to keep them warm. both the male and the female bring food for the offspring to eat until the young are mature enough to find food on their own. which of these most likely describes why birds such as the magnolia warbler build nests in which to raise their offspring? a. nest building decreases the amount of energy used by the parent birds to raise their offspring to adulthood. b. nest building increases the probability that the offspring will survive and eventually produce offspring of their own. c. nest building decreases the amount of food that the offspring require the adult birds to provide. d. nest building increases the probability of the offspring being located by airborne predators.