Levene made which contribution to our understanding of DNA structure? a. He determined that the nucleus contains DNA. b. He determined that DNA contains four nitrogenous bases  c. He determined that DNA consists of nucleotides. d. He determined that the nitrogenous bases of DNA are present in regular ratios

Refer to the relative proportions diagram in the first picture. 1. To help reveal patterns in the data, graph the data from the table on the grid provided (the second picture). 2. Write two inferences based on your observations and analysis of the patterns that emerge from the data. Your inferences should give insight into the structure of DNA. 3. Formulate two or three claims about the data in Part 1. Be sure each claim is supported by the data. 4. Using the claims you developed, complete the data table that is provided in the picture (Relative Proportions Chart that is labeled "For question 4".

Why do DNA and RNA move toward the positive electrode in electrophoresis?   A. The phosphate groups in DNA and RNA are positively charged.    B. The phosphate groups in DNA and RNA are negatively charged.      C. The nucleotide bases in DNA and RNA are positively charged.      D. The nucleotide bases in DNA and RNA are negatively charged.

Which pattern does the structures of dna follow in that its replication results in one parent molecule and one daughter molecule.

Explain why scientists preferred proteins as the source of genetic material over DNA.   A. DNA seemed too simple of a molecule compared to proteins   B. Proteins are made up of combinations of 20 different amino acids compared to DNA's 4 bases. The larger number seemed more likely to account for all the variety and diversity in organisms.   C. Scientists knew more about proteins than they did DNA.   D. All of the answers are correct explanations.

Which statement accurately describes the differences between RNA and DNA? RNA always folds into a single helix while DNA always folds into a double helix. RNA contains the nitrogenous base thymine, while DNA contains the nitrogenous base uracil. RNA contains pyrimidine bases, while DNA contains purine bases. The nucleotides in DNA contain one phosphate group while those in RNA contain two phosphate groups. The sugar in DNA contains one less hydroxyl group than the sugar in RNA.

Which of the following is true about DNA? a. DNA consists of two strands of nucleotides held together by weak hydrogen bonds. b. DNA has a globular shape. c. DNA contains the sugar, ribose. d. DNA contains the encoded information for building phospholipids.