3. Which of the following is NOT an example of the principles of natural selection?

kotegsom [21]

1)Chargaff's rules state that DNA from any cell of any organisms should have a 1:1 ratio of pyrimidine and purine bases and, more specifically, that the amount of guanine should be equal to cytosine and the amount of adenine should be equal to thymine. This pattern is found in both strands of the DNA.

2)DNA structure

DNA is made up of molecules called nucleotides. Each nucleotide contains a phosphate group, a sugar group and a nitrogen base. The four types of nitrogen bases are adenine (A), thymine (T), guanine (G) and cytosine (C). The order of these bases is what determines DNA's instructions, or genetic code.

3)A nucleotide consists of three things: A nitrogenous base, which can be either adenine, guanine, cytosine, or thymine (in the case of RNA, thymine is replaced by uracil). A five-carbon sugar, called deoxyribose because it is lacking an oxygen group on one of its carbons. One or more phosphate groups.

4)DNA replication is said to be semi-conservative because of this process of replication, where the resulting double helix is composed of both an old strand and a new strand. ... Semiconservative replication would produce two copies that each contained one of the original strands and one new strand.

5)The diagram has show in above.

6)complementary base pairing is necessary because the double helix shape would not be the same if not. Doubles would only pair with doubles and the singles to singles.

HOPE THIS HELPS YOU.

7 0

3 years ago

Don't know how to do it

OLEGan [10]

Same but like I got to answer questions before I can ask so sry

7 0

2 years ago

Scientist often referred to mushrooms as the dark matter of biology because we don't know much about them. Mushrooms are not pla

stiks02 [169]

Answer:

Mushrooms and plants all need energy to grow. But the sources of their energy differs.

Explanation:

Sun is the ultimate source of energy for any living organisms to grow and make their food. While plants takes energy from the sun directly and make their food, while the mushrooms which is not a plant does not take energy from the sun directly.

Mushrooms utilizes the energies which is collected by the different organism which collects their energy from the sun such as organisms like the bacteria and plants. Mushrooms grow well in darkness as darkness helps to retain moisture. Mushrooms does not have chlorophyll to make food.

Plants have chlorophyll. And they direct absorb energy from the sun light to make their own food.

5 0

2 years ago

Name 4 body systems that are involved in getting oxygen to your cells

storchak [24]

The respiratory system, circulatory system, muscular system, and nervous system.
Hope this helps!:)

4 0

2 years ago

The basis for differentiation between gray matter and white matter in the cns is the presence of __________ in white matter.

Evgesh-ka [11]

Answer:

myelinated fibers

Explanation:

The basis for differentiation between gray matter and white matter in the cns is the presence of myelinated fibers in white matter

6 0

3 years ago