If there are 2000 nucleotides in a strand of dna and 600 contain the nitrogen base cytosine, how many nucleotides contain adenine?

Well, if there are 600 cytosine, there’s also 600 guanine. 2000-1200=800 800/2=400 There are 400 adenine.

1. true.2. true.3. true.4. false.5. true.the concept of darwin's theory of evolution involves the idea that there are limited resources in a given living environment and that the organisms which live within have variations in their genetic make up due to random mating. the ones with beneficial genetic variations can express certain traits which give them an upper hand in surviving and reproducing in the said environment compared to ones who may have a more disadvantageous variation in traits. over time, the organisms with an upper hand will survive and reproduce more frequently and pass on their beneficial genes while the others die. the result is evolution, where we observe (usually, but not always) eventually, phenotypic distinct changes.