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Andreyy89
4 years ago
6

Why is the grass green? Why is the sky blue? How does a bird fly? We know the answers to these questions because scientists use

scientific methods to understand the natural world. What methods do scientists use to investigate these natural world questions?
A) research
B) observation
C) experimentation
D) research, observation, and experimentation
This is in Usatestprep.
science
Biology
2 answers:
ollegr [7]4 years ago
7 0

Answer:

bruh imagine- period 8 lolllll

Explanation:

tehe

Anna71 [15]4 years ago
3 0

Answer:

b

Explanation:

they see/observe the sky and the grass

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Red blood cells will swell and burst.

The reason behind this is that red blood cells are okay when they are in the plasma (the watery part of the blood) because the solutes in plasma are so  well balanced that plasma is rendered isotonic. An isotonic solution is a type of solution that has the same salt concentration as its surrounding environment and thus the substances around it e.g. cells neither gain nor lose water. In the blood plasma, the red blood cells neither lose nor gain water  and so they remain intact.

However distilled water is hypotonic (has less or no solutes) and therefore osmosis will take place when red blood cell which have a higher solute concentration are placed in it. Water molecules will leave the distilled water and pass into the red blood cells through the semi-permeable membrane of the cells in an attempt to equalize the difference in osmotic pressure on either side of the membrane. In so doing, water will accumulate in the cell which will then swell to capacity and ultimately burst.

 

7 0
4 years ago
Read 2 more answers
Atoms can’t ever be __________ or<br> __________ in a chemical reaction.
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Answer:

seperated or joined

Explanation:

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3 years ago
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5. DNA replication of the circular chromosome in E. coli begins when a protein called DnaA binds to the replication origin on th
dem82 [27]

Answer:

Adenine; Thymine

Explanation:

  • The origin of replication in E.coli is called the oriC
  • This region is rich in Adenine and Thymine bases because their base stacking interactions are weaker than those of Cytosine and Guanine.
  • Between A and T bases there are only 2 hydrogen bonds (not a very strong interaction so requires less energy to separate) while between C and G bases there are 3 hydrogen bonds (strong interaction thus requires more energy to separate)
  • The oriC is a region which needs to be separated when replication occurs. It is thus a region which requires easy separation with as little energy as possible so that proteins like DnaA can bind.
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3 years ago
Changing the number of<br> _would change an atom into an atom of a different element.
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Changing the number of protons would change it into an atom of a different element.

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The precursor of a mitochondrial matrix protein is found in a mutation in the tom22 signal receptor.

Tom22 and Tom20 function as N-terminal matrix targeting sequences' outer mitochondrial membrane receptor proteins. The buildup of mitochondrial matrix-targeted proteins in the cytosol due to a malfunctioning Tom22 receptor protein may be followed by cytosolic turnover of these proteins.

The N-terminal sequence, which directs the protein to mitochondria and is proteolytically processed upon import3, is produced in approximately 70% of mitochondrial precursor proteins3. To get to the matrix, they must pass via the TIM23 and TOM complexes on the inner and outer membranes, respectively.

To learn more about Mitochondrial visit: brainly.com/question/28536784

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