Answer:
The DNA (deoxyribonucleic acid) is a double stranded molecule function as a genetic material in many organisms. It is comparatively stable molecule than RNA because of hydrogen bonds found in it and also due to lack of an oxygen atom. It's basic unit is nucleotide which comprises of a nitrogenous base, ribose sugar and a phosphate group. There are four type of nitrogenous bases found in DNA known as Purines (guanine +adenine) and pyrimidines (cytosine + thymines). As the name indicates the purines are double ringed while pyrimidines are single ringed.
This question is based on the concepts of watson and crick model of DNA. According to which base form bonds with their complementary bases like adenine form double hydrogen bond with thymine and cytosine form triple hydrogen bond with thymine.
Hydrogen bonding is function of hydrogen in which it form bond with atoms of higher electronegativity (ability to attract the bonding pair) like oxygen.
Not regally sure about this question I’m stuck on this one to
<span>Lentic is slow moving water,including pools,ponds and lakes.
Lotic is fast moving water,for example streams and rivers.
<span>Wetlands are areas where the soil is saturated or inundated for at least part of the time.
Hope this helps :D</span></span>
Hello!
An initial observation is the first thing a scientist notices about a topic before conducting the experiment. We can see that it is the first thing in the paragraph in this case, that dandelions grow as unwanted weeds in many lawns.
The hypothesis is the guess about the result of an experiment made before the experiment is conducted. In this case, it is that a weed killer (Killimal) would kill all the dandelions while leaving the grass healthy. This is not specifically a guess made by the scientist, but more like a prediction he wanted to verify.
An independent variable is the variable being changed in the experiment by the scientist. Here, it is whether Killimal was sprayed or not.
The dependent variable is the variable being measured, and the one being affected by the independent variable. His observation would be whether the grass and dandelions would be killed. This is because the weed killer would be directly affecting whether or not these would be killed.
The control variables are ones which are kept the same in the experiment as to not interfere with the final results. In this case, it would be the density of dandelions, the amount of sunlight, and the amount the plants were watered. These were kept exactly the same, as they could've affected the dependent variable if changed.
The control group was the one that is not impacted by the independent variable. The control group makes sure that it actually is the independent variable affecting the dependent, and it isn't some outside unknown variable. This would be the plot without the Killimal.
The experimental group is the one being experimented on from the independent variable. This would be the plot with the Killimal.
Hope this helps!
