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mafiozo [28]
3 years ago
14

Some maerials can move across the cell membrane against a concentration gradient by

Biology
1 answer:
KATRIN_1 [288]3 years ago
7 0
Facilitated diffusion goes against a concentration gradient
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Which of these sentences is true about the virus?
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The sentence which is true or a fact about the virus is the sentence in letter B. Viruses can reproduce only within other cells. <span>Viruses are intracellular obligate parasites they can not replicate or express the genes with out living host. </span>
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3 years ago
PLEASE HELP!!!! MULTIPLE CHOICE
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Which is happening when humans control the breeding of living things to favor certain desired features?
matrenka [14]
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3 years ago
PLEASE I NEED THIS ASAP If you had a cell that was cube-shaped with a side length of 20µm, calculate the surface to volume ratio
weeeeeb [17]

Answer:

Ratio = 3\times 10^5

Explanation:

Side of a cube, a = 20 µm

a=20\times 10^{-6}\ m

The surface area of a cube, A = 6a² (a is side of the cube)

The volume of a cube, V = a³

The ratio of the surface to volume ratio of the cell will be given by :

R=\dfrac{6a^2}{a^3}\\\\R=\dfrac{6}{a}\\\\R=\dfrac{6}{20\times 10^{-6}}\\\\R=3\times 10^5

So, the ratio of the surface to volume ratio of the cell 3\times 10^5.

6 0
3 years ago
1) Sucessão ecológica é o nome dado a uma série de mudanças que ocorrem nas comunidades de um determinado ecossistema. Sobre a s
dimaraw [331]

Answer:

A sucessão primária ocorre em ambientes estéreis, onde não havia vestígios de organismos vivos que a ocupassem antes. Esse ambiente pode ser um local vulcânico em que a lava derretida destruiu o meio ambiente ou foi causada por dunas. A comunidade inicial de organismos para habitar esses ambientes é conhecida como sucessores primários ou colonizadores primáriosrimários

Explanation:

Primary colonisers initiate primary succession as such they are important to the future of such environments. They are though breeds of organisms that make use of scarce resources to survive in harsh environments. Without their ability to survive, there will be little or no way other forms of succession can take place. Reasons, why they may not persist, maybe too much stress imposed on them by the environment and above all their inability to compete when other successors come on board.

6 0
3 years ago
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