Answer:
The correct answer is b. He determined that DNA contains four nitrogenous bases.
Explanation:
Levene was an American biochemist who studied the structure of DNA in the early 1900s and in 1920 he found that DNA consists of four nitrogenous bases that are Adenine, Guanine, Thymine, Cytosine.
He also found deoxyribose sugar and phosphate group and said that nucleotide is the basic unit of DNA which contains a ribose sugar with attached nitrogenous base and phosphate group.
He also concludes that an equal amount of adenine, guanine, thymine, and cytosine makes the DNA which is now known as tetranucleotide hypothesis. So the correct answer is b. He determined that DNA contains four nitrogenous bases.
The two stages of photosynthesis: Photosynthesis takes place in two stages: light-dependent reactions and the Calvin cycle (light-independent reactions). Light-dependent reactions, which take place in the thylakoid membrane, use light energy to make ATP and NADPH.
Answer:
C. fungus-like protist
Explanation:
The fungus-like protists are organisms that seem like plants, but are much more closely related to the animals. They tend to be parasitic, thus they use a host in order to be able to get the needed nutrition. Unlike the producers, the fungus-like protists are not capable of performing the process of photosynthesis, thus they do not produce their own food. Considering these characteristics, it is no wonder that they can mostly be found on dead plants from which they can feed upon.
1. B blood type that is a multiple allele trait
2. A height from short to tall that is a polygenic trait
