<span>The correct answer is b. Option a is incorrect because these models can demonstrate scientific theories, but they don't prove scientific theories (you would need experiments for that). Option c is incorrect because the models aren't always representing something abstract (i.e. DNA is very real, just very small). Option d is incorrect because they don't precisely mimic something in nature, but instead help us visualize something in nature that is difficult to see or comprehend.</span>
Not including the variety generated by crossing over, 16
They have the same nuclear number (p.s. this is a chemistry question!) :)
<span>Sequence complete RNA strands directly and in real-time. Or, cDNA ‘strand-switching’ protocol also allows full-length sequencing of cDNA, either with or without PCR amplification.</span>
