Imagine that you travelled back in time to the early 1940s. you meet a group of scientists, and tell them that dna is the hereditary material. why might the scientists refute your statement?

choose the correct answer from the following choices, and then select the submit answer button.

dna is linear and appears relatively "simple."

dna does not appear to (directly) carry out many cellular functions.

proteins can have intricate three-dimensional structures.

proteins are integral parts of many cellular processes.

all of these choices are correct.

All of these choices are correct.

Explanation:

Before the discovery of DNA as genetic material, proteins were considered to be the biomolecules that store genetic information. Proteins are present in all the cells. They are present in the form of complex secondary and tertiary structures. Proteins are involved in almost all cellular processes in the form of enzymes. Proteins present in the cell determine the phenotype of organisms. Therefore, the complex structures of proteins were supposed to be the carrier of the genetic information.

On the other hand, the linear structure of DNA was considered to be too simple to serve as a carrier of genetic information. Also, DNA molecules do not directly determine the phenotype and are not directly involved in a number of cellular processes. So, DNA was not considered to be a molecule to serve as genetic material in the early 1940s.

preservation because he preserves part of the land and preserves means save

explanation:

step 1 ammonium can be absorbed by plants, but some is converted into nitrates which are better for plants to absorb. this is called nitrification. 2. step 2 the deer eats the plants and uses the nitrogen-containing proteins for cell growth. 3. step 3 bacteria in the soil conduct nitrogen fixation to convert nitrogen gas from the atmosphere into ammonium. 4. step 4 some of the nitrates are absorbed back into plants, but denitrification breaks down the nitrates into nitrogen gas released back into the atmosphere. 5. step 5 nitrogen is found in the urine, which gets broken down into ammonium through the process of ammonification. 6. step 6 plants absorb the ammonium and begin assimilation, the process to add the nitrogen to protein.