1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
xxTIMURxx [149]
3 years ago
9

Which of the following did Watson and Crick already know when they were trying to determine the structure of DNA? The number of

_____. Which of the following did Watson and Crick already know when they were trying to determine the structure of DNA? The number of _____. guanines is always the same as thymines pyrimidines is always larger than purines cytosines is always the same as adenines purines is always larger than the number of pyrimidines purines is always the same as pyrimidines
Biology
1 answer:
Andre45 [30]3 years ago
7 0

Watson and Crick already knew that the number of purines is always the same as pyrimidines.

The scientists that contribute to discovery of DNA and its complete structure:

•  Friedrich Miescher-was the first who found DNA inside the nucleus (first it was called nuclein) while he was trying to discover the protein components of leukocytes (1869)

• Phoebus Levene- was the first who discovered three major components of a nucleotide (1919)

• Erwin Chargaff –discovered that the total amount of purines (A + G) and the total amount of pyrimidines (C + T) are nearly equal (Chargaff’s rule) (1950)

• Rosalind Franklin and Maurice Wilkins, did an important X-ray crystallography work that contributed to Watson and Crick's discovery of double-helical model for the structure of DNA.

You might be interested in
Please answer my question correctly​
Art [367]

Answer:

6. B. Altitude

7. B. Intertropical Convergence Zone

8. A. Hundreds

Explanation:

The following factors affect monsoon, except altitude.

ITCZ stands for Intertropical Convergence Zone.

It takes hundreds of years for soil to be replaced.

8 0
2 years ago
An organisms phenotype is
katen-ka-za [31]

Answer:

C) Its physical appearance

Explanation:

The way I remember what phenotype is, is that both physical and phenotype begin with a p.

Hope this helped :)

5 0
3 years ago
Read 2 more answers
An animal can wound a tree by scratching away the bark.. The tree can respond to the wounded many ways. Usually sapped quickly c
Naya [18.7K]

Answer:

the answer is A, cellular reproduction.

Explanation:

because cellular reproduction is a process by which cells duplicate their contents and then divide to yield multiple cells with similar, if not duplicate, contents, basically reforming itself again.

3 0
2 years ago
*What is the chemical equation for photosynthesis? What is the reverse of this chemical process called?
mestny [16]

Answer:

The process of photosynthesis is commonly written as: 6CO2 + 6H2O → C6H12O6 + 6O2. This means that the reactants, six carbon dioxide molecules and six water molecules, are converted by light energy captured by chlorophyll (implied by the arrow) into a sugar molecule and six oxygen molecules, the products.

There is one chemical process in biochemistry that has a reversible process. If you remember glycolysis, it actually has a reversible process. This reversible process is called gluconeogenesis. These two processes are reversible in response to glucose concentration in our bodies. When our bodies need energy, glucose breaks down into pyruvate through glycolysis. When our bodies need glucose for storage, pyruvate turns back into glucose through gluconeogenesis. Here are the processes:

6 0
2 years ago
Unlike the cell wall, the cell membrane _____.
Maksim231197 [3]

Answer:

Is found in all cells

Explanation:

  • The cell membrane is not made up of chromatin. Chromatin is found in DNA.
  • The cell membrane obviously does not produce energy for the cell. It acts as a barrier that lets things in and keeps things out.
  • Lastly, the cell membrane is not a rigid layer of cellulose. Cellulose is a component of a <em>cell wall. </em>

To conclude, the cell membrane is found in all cells.

4 0
3 years ago
Other questions:
  • Summarize why the fish heart and circulatory system are considered important evolutionary changes
    7·1 answer
  • Animals inhale air containing oxygen and exhale air with less oxygen and more carbon dioxide. after inhalation, the oxygen missi
    5·1 answer
  • Provide an explanation as to why bacteria from each location displayed its pattern of growth
    8·1 answer
  • What element is found in the nuclear reactor core?
    10·2 answers
  • Why don’t all water droplets fall to Earth?
    9·1 answer
  • Why are there one vacuole in a plant cell and multiple in a animal cell?
    11·1 answer
  • Which of the following statement is true of a semi-conservative model of replication?
    10·2 answers
  • Your father is heterozygous for brown hair. Your mother is also heterozygous. Brown hair is dominant and blond hair is recessive
    15·2 answers
  • Need help please don’t send any links.
    11·2 answers
  • Human cells have 46 chromosomes. Each chromosome consists of a pair of identical chromatids attached together by a structure cal
    15·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!