The world use to be just one big super continent until the tectonic plates and earths surface broke it apart into the 7 continents now. Basically the world was all connected so the plant and animal fossils would have been in the same place at the time.
Answer:
The correct answer would be B. fatty acids, DNA.
The other options show the pairing of polymer and their monomer units.
For example, proteins are the polymers of amino acids, starch is polymer made up of several glucose units.
Similarly, DNA or deoxyribonucleic acid is a double stranded molecule made up of nucleotides (not fatty acids) attached via phospho-di-ester bond.
The nucleotide is consisted of deoxyribose sugar, a nitrogenous base, and phosphorus group.
Thus, fatty acids and DNA make the inappropriate pairing as compared to other options.
Answer:
If there is no evolution takes place in her DNA then the evidence will be same genes from her parents.
Explanation:
Answer:
The correct option is D. The nerve and red blood cells will turn on and off different portions of their DNA, using different genes to make different proteins.
Explanation:
A zygote is totipotent which means it has the ability to differentiate into any cell type found in the body along with the placental cells.
The nerve and red blood cells are specialized cells and they cannot differentiate into any other cell type.
All cells in the body are formed from the zygote. All the cells in the body have the same chromosomes and the same genes. However, these cells become specialized because certain part of the DNA is activated in one type of cell which helps it perform its function. Different genes are activated in different specialized cells which are able to transcribe and translate.
Answer:
1.A single band of intermediate density.
Explanation:
According to semiconservative model of DNA replication, the two strands of one DNA molecule separate at the time of replication and each strand acts a template for a new strand. So, the resulting new DNA molecule has one old strand and one new strand.
Here, the E coli cells were grown originally in 14N medium. So all the DNA molecules had 14N strands. When they were transferred to a 15N medium, only 15N was available then for further replications. In the first round of replication in new medium, all the old 14N strands (14N14N) separated and formed a new strand each using 15N. Hence all the resulting DNA molecules had one 14N strand and one 15N strand (14N15N).
Since 14N is of lighter density and 15N is of heavier density, 14N15N strands will give band of intermediate density. Since after one round of replication all DNA molecules will be 14N15N, there will be only one band of intermediate density.
