What nitrogen base is present in dna but absent in rna?

The spongy mesophyll of leaves is found on the top of leaves, where most photosynthesis occurs.

Why does the aquarium trade contribute to the introduction of nonnative species? a. Exotic species can escape or be released into local ecosystems. b. Aquarium owners do not always understand how ecosystems interact. c.

How did earth end up with so much oxygen

If blockages of this type occur, the most likely result would be that

Explain what causes oxyhemoglobin to dissociate readily in actively respiring tissues?

When astronauts brought back rock samples from the Moon, the minerals present were mostly the same as those found on Earth.

The lightest wight rocks are found in the

Carbon is an element that is essential for the make up of a) no molecules b) all molecules c) organic molecules b) inorganic molecules

Charlene just said hi what do you think she is thinking

C ^H! @O ^ + O @S 6 CO @ + 6 H @O DG = - 686 kcal/mol This reaction represents cellular respiration. What happens to the energy released from glucose during this reaction?