Vet track

How many unique DNA and RNA nucleotides are found in Nature - My initial thought was 5; Cytosine, Thymine, Adenine, Uracil, and Guanine. But the key says I'm wrong, I'm hoping this is a typo?

SO, just in general, I'm having difficulty telling the difference between chromosomes, chromatids, sister chromatids, Homologous pairs, n and 2n. But I would really appreciate it if someone could explain how to get the answer for the question below. My initial thought was that there would still be 20... but the back of the book said that was wrong. It was a MC with none of the above as the answer so I was thoroughly confused. If a diploid cell with 20 homologous pairs completed meiosis and cytokinesis, each cell formed would contain _____ homologous pairs. Oh I was thinking of mitosis, whoops, would the answer be 0? I got that from looking at an example problem, so I'm not completely sure why there would be 0 I feel like I'm talking my self through this at this point, but please correct me if I'm wrong. So during meiosis, the division nd replication results in 1 of each origional "type" of chromosome in each new cell so there are no Homologous pairs because no chromosomes "match" each other.

I'm actually using a laser diffraction method, but, if I understand correctly, since I'm calculating for the first distance I should plug in 1 for n? Thanks

I need to use the equation wsinθ=nƛ to find w or width. I know θ = 0.6, and ƛ (wavelength?)=655nm. But I have no idea what the n variable means. I looked it up on wiki (well wiki was one of the only site that recognized the equation) and it said "n is any integer". I'm fairly certain plugging in any integer will not produce the correct width. In an earlier equation (tanθ=yn/L) n appears as a subscript. in this case the value I was plugging in was y1 so should I plug 1 into wsinθ=nƛ ?

Oh! I hadn't thought of that, It would kill any organisms working to break down waste at a landfill which would halt that process, and result in faster accumulation of waste. Thanks for the help StringJunky and studiot.

Yes? they are soluble in water. So if they were in a landfill, or going down a drain, does this mean the water would carry them too far?

HI all, I'm studying safety procedures with chemical substances as preparation for a lab, and my question is why copper salts can't end up in a landfill. I know they are highly toxic to living things and landfills have an effect on the environment around them, and that they are dangerous if untrained perssonnel are handling them, but is there more? Thanks!