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Contact [7]
3 years ago
13

The double helix structure of DNA

Biology
1 answer:
dangina [55]3 years ago
6 0

Answer:

The double-helix structure of DNA: <u><em> Watson, Crick, Franklin </em></u>

The chemical composition of proteins: <u><em>Mulder   </em></u>

The monomer of nucleic acids:<u><em> Levene</em></u>  

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In salt water fish, chloride cells in the gills: a. actively transport Cl- from the plasma to the ECF. b. actively transport Cl-
lord [1]

Answer:

b. actively transport Cl- from the ECF to the external environment.

Explanation:

Chloride cells are cells that are found in the gills of teleost fishes which pump large amount of sodium and chloride ions out from the extracellular fluid (ECF) into the sea or environment against a concentration gradient in marine fish.

The opposite of this process occurs in freshwater fishes where the gills of freshwater teleost fish, cause an influx of sodium and chloride ions into the fish from the environment, also against a concentration gradient.

Mechanism of action

Salt water teleost fishes take in large amounts of seawater to decrease osmotic dehydration. The excess of ions derived from seawater is thrown out of the teleost fishes through the chloride cells. These cells employs active transport on the basolateral (internal) surface to diffuse in chloride, which then is pumped out of the apical (external) surface, straight into the surrounding environment. Such mitochondria-rich cells are located in the region of the gill lamellae and filaments of teleost fish.

3 0
3 years ago
·four valence electrons
Helen [10]
The answer is carbon, hoped this helps you!
7 0
3 years ago
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BRAINLIESTTTT ASAP!!!
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The moon has a higher maximum surface temperature compared to Earth (253 degrees of moon to 136 degrees of Earth), but this also depends on night (which is colder) or day (which is hotter).

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Which subatomic particle is positively charged?
EastWind [94]

Answer:

Proton

Explanation:

Neutron are neutral, ion I am not sure but are not positive, and electron are -.

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3 years ago
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What is selective dreeding?
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I believe you meant 'selective breeding'.
Selecitve Breeding is when say a dog breeder, chooses two prospective parents in hopes of achieveing a superior offspring or offspring with desired traits.
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