B. Metaphase II
C. Mitosis
D. Prophase I
The correct answer is option D. Prophase I
The crossing over is a phenomena, which occur in the cells undergoing meiosis. In the process of crossing over, the exchange of the genetic material takes place between the sister chromatids. This process takes place in the prophase 1 stage of meiosis 1 in the gametes. The exchange of genetic material between chromatids cause recombination, and hence, genetic variation.
Answer:
Thymine= 60 ng
Guanine= 20 ng
The complementary base pairing occurs between adenine and thymine and guanine and cytosine bases.
Explanation:
According to the Chargaff rule, a double-helical DNA molecule has an equal number or equal amount of adenine and thymine bases since adenine always pairs with thymine. Similarly, the amount of guanine base is equal to that of the cytosine base.
Chargaff rule is based on the complementary base pairing between purine and pyrimidine bases. According to the given information, the amount of adenine is 60 ng. Therefore, the cell would have 60 ng thymine. Similarly, the amount of the cytosine base in the cell is 20 ng which means that the cell would have 20 ng of guanine base.
According to Chargaff's rules, the amount of adenine is equal to the amount of thymine, and the amount of cytosine is equal to the amount of guanine in a DNA molecule. Thus, the cell should have 60 ng of thymine and 20 ng of guanine.
The question refers to the base pairing rules in DNA, which were discovered by Erwin Chargaff and are now known as Chargaff's rules. According to these rules, the amount of adenine (A) in DNA is always equal to the amount of thymine (T), and the amount of cytosine (C) is always equal to the amount of guanine (G).
In this case, if the DNA analysis reveals that the cell has 60 ng of adenine, the cell should also contain 60 ng of thymine according to Chargaff's rules, since A = T. Similarly, if the cell contains 20 ng of cytosine, there should be 20 ng of guanine as well, because C = G.
So, based on the base pairing rules in DNA, the cell should have 60 ng of thymine and 20 ng of guanine.
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Answer:
The correct answer will be option-D
Explanation:
The cell cycle is the cyclically ordered sequence of events taking place in the cells associated with the division of the cell.
The cell cycle takes place in two phases: the interphase proceeded by M-Phase. The interphase of the cell cycle proceeds in G₁, S and G₂ phase. During the G₁ phase, the cell prepares itself to prepare for the next important phase marked by the synthesis or replication of the genetic component of the cell.
The changes that take place during the G₁ phase thus includes the increase in size and the production of ATP as DNA replication is an energy-dependent process.
Thus, Option-D is the correct answer.
Answer:
Explanation: just got it right on my USATESTPREP its LETTER D.
B. primary consumer
C. secondary consumer
D. tertiary consumer
Answer;
C. secondary consumer
Explanation;
-Secondary consumers are largely comprised of carnivores that feed on the primary consumers or herbivores
-A ladybug is a secondary consumer. It eats plants and small insects that destroy plants. The small insects that it eats include aphids, which makes ladybugs good for the garden. Ladybugs, in turn, are eaten by other animals such as frogs.
B. 68% of the molecules have speeds between 450 meters/second and 550 meters/second.
C. 50% of the molecules have speeds between 450 meters/second and 550 meters/second.
D. 34% of the molecules have speeds greater than 550 meters/second.
68% of the molecules have speeds between 450 meters/second and 550 meters/second is correct option.
Nitrogen's rms speed will be (4 / 28) = 0.378 of helium's rms speed, yielding a speed of 0.378 1370 m s–1 = 517 m s–1. Now the factor is (4 / 44) = 0.301, resulting in a speed of 0.301 1370 m s–1 = 413 m s–1.
This data best supports the hypothesis that 68 percent of the molecules travel at speeds of 450 to 550 meters per second. B is the solution to your query.
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