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ruslelena [56]
3 years ago
8

PLEASE HELP BIOLOGY!!!! (15 POINTS!)

Biology
1 answer:
Leokris [45]3 years ago
6 0
1. Some substances passes through small holes in the surface cell membrane. This is called diffusion and does not require cell to expend energy.In this way the passive transport occur if the cell doo not expend any energy. 2.In active transport,the particles move across the cell membrane from slower concentration to higher concentration . Active transport is the energy requiring process of pumping molecules and ions across membranes uphill against a gradient.This process uses the energy of ATP. 3. Endocytosis and Exocytosis are important mechanisms for bringing substances into and out of a cell.The vesicles fuse with the plasma membrane ,causing the contents of the vesicles to spill outside the cell.
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Which is NOT part of cell theory?
nekit [7.7K]

Answer:

cells contain membrane- bound organelles

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3 years ago
In the laboratory, you have a beaker containing 100 milliliters (mL) of NaOH solution at pH = 13. Into this beaker, you carefull
romanna [79]

Answer:

d. The pH of the beaker`s contents will decrease.

Explanation:

Since the new substance is an acid and has a very low pH, that is 1. it will reduce a little bit the pH of the original base (NaOH). Some ions of hydrogen of the acid are going to react with the hydroxyl group of the sodium hydroxide to form water.

Since the differences of the volume is big, only a small part of the base is going to be neutralize, but at the end, the final pH of the solution is still going to be  a base.

Hope this information is useful.

3 0
3 years ago
Please answer as best you can.
Likurg_2 [28]
Of the two?
2.         T      t
         Tl TT  Tt
          tl  Tt    tt

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thats all i can do sorry

5 0
4 years ago
Read 2 more answers
Name the organ systems that come in contact with the external environment
galina1969 [7]
The answer for this question would be Integument, digestive, respiratory and urogenital.
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6 0
4 years ago
The hardy-weinberg principle states that _____ in a population do not change unless outside factors affect the gene pool.
Reika [66]

Answer;

-Allele frequencies

The hardy-weinberg principle states that allele frequencies in a population do not change unless outside factors affect the gene pool.

Explanation;

Hardy-Weinberg principle  is a mathematical model that describes how genotype frequencies are established in sexually reproducing organisms.

The Hardy-Weinberg equilibrium is a principle stating that the genetic variation in a population will remain constant from one generation to the next in the absence of disturbing factors. The Hardy-Weinberg equilibrium can be disturbed by a number of forces, including mutations, natural selection, nonrandom mating, genetic drift, and gene flow.

6 0
3 years ago
Read 2 more answers
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