What purpose does the alcohol serve in this lab? Why is this an important step?

Biology

1 answer:

Juli2301 [7.4K]3 years ago

8 0

Explanation:

The role of alcohol in DNA extraction is to precipitate DNA into a visible form. Also, it's used in DNA washing and storing

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Natural selection is based on Darwin's observation that individuals most likely to survive and reproduce are those

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with traits best suited to their current environment

Explanation:

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Anna tries to keep her kilocalorie intake under control. She eats mostly lean meats or fish and a lot of vegetables. Yesterday,

n200080 [17]

Answer:

The calories Anna consumed for dinner is 315 kcal (300kcal). The calories that came from proteins is 108 kcal (100kcal).

Explanation:

Macronutrients are nutrients such as protein, carbohydrates, and fat that provide the energy required for the normal functioning of the body. Usually, the energy obtained from macronutrients is expressed in calories. Each gram of protein provides 4 kilocalories while each gram of fat provides 9 kilocalories. Carbohydrates per gram also provide 4 kilocalories.

Here, Anna consumed 7 grams of fat (in salmon)

, 36 grams of carbohydrates (in sweet potatoes and asparagus) and 27 grams of protein (in salmon, sweet potatoes, and asparagus) for the dinner.

Therefore, total calories in 7 grams of fat is $7*9=63$ kilocalories.