Multicellular organisms need a transport system to efficiently move substances across greater distances, which is not possible by diffusion alone in larger organisms. These systems also help in maintaining balance within the body conditions.
Multicellular organisms need a transport system to efficiently move nutrients, gases, waste products, and signaling molecules between their interior and exterior environment. In simple organisms, diffusion across cell membranes is sufficient for this purpose. However, in larger multicellular organisms, diffusion is not efficient enough due to the greater distances. Therefore, they have evolved specialized systems for internal transport, like the circulatory system in humans or the xylem and phloem in plants. Additionally, a transport system helps maintain homeostasis by balancing different internal conditions such as pH, temperature, and concentration of various substances.
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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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B. Solar activity
C. Earth's tilt
D. Volcanic activity
Since prokaryotes do not have many specialized structures, they do not have many specialized functions. Therefore, the correct option is D.
Simpler organisms known as prokaryotes lack a true nucleus and membrane-bound organelles. Compared to eukaryotic cells, they do not have as many specialized structures. Prokaryotes are highly successful and diverse organisms that, despite their simplicity, can be found in a wide variety of habitats. They have developed a variety of adaptations and processes that enable them to thrive and live in a variety of settings.
Prokaryotes are important to nutrient cycling, food chains, and many ecological processes. Despite having a relatively simple cellular structure, they can perform various essential living activities such as metabolism, reproduction, and response to environmental stimuli.
Therefore, the correct option is D.
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Answer:
D
Explanation:
Quizlet
. Because prokaryotes do not have many specific structures, they _____.
do not have many specific functions
The given question is incomplete as the options are missing. The options of the given question are as follows-
(A) The solar radiation from the Sun is equally distributed across the Earth at all times.
(B) The gravitational energy from the Sun varies greatly in different regions of the Earth.
(C) The Earth spins at different rates so the rotational energy of the Earth varies.
(D) The Earth receives different amounts of solar energy in different regions.
Answer:
Option (D)
Explanation:
The earth receives uneven incoming solar radiation at different places, as a result of which some places are heated more extensively and some places are comparatively less cold. Due to this difference in temperature, along with the changing pressure conditions, and Coriolis effect, there occurs different climatic and weather patterns at different places.
The equatorial region receives the maximum amount of sunlight so, the temperature in this region remains comparatively higher throughout the year, and the polar regions are much colder. It is because the sun is directly incident on this layer.
So, there occurs a contrasting climate pattern globally that causes various changes on the surface of the earth.
Thus, the correct answer is option (D).
Answer:
The Earth receives different amounts of solar energy in different regions.
Explanation:
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