Question

question 5
0.5 pts
the four elements that make up the bulk of all living things are:
carbon, helium, radon, and calcium
hydrogen, nitrogen, sodium, and mercury
carbon, hydrogen, oxygen, and nitrogen
oxygen, chromium, cadmium, and sulfur
question 6
0.5 pts
how many kcalories are supplied by a slice of pizza containing 30 grams of carbohydrate, 10 grams of protein, and 15 grams of fat?
155
295
350
470

Explanation:

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Question 5

These four elements are the primary building blocks of biological molecules like carbohydrates, proteins, lipids, and nucleic acids, which form the structure and carry out the functions of all living organisms. The other options include elements that are either rare, toxic, or not foundational to life.

Step1: Calories from carbohydrates

Carbohydrates provide 4 kcal per gram:
$30 \text{ g} \times 4 \frac{\text{kcal}}{\text{g}} = 120 \text{ kcal}$

Step2: Calories from protein

Protein provides 4 kcal per gram:
$10 \text{ g} \times 4 \frac{\text{kcal}}{\text{g}} = 40 \text{ kcal}$

Step3: Calories from fat

Fat provides 9 kcal per gram:
$15 \text{ g} \times 9 \frac{\text{kcal}}{\text{g}} = 135 \text{ kcal}$

Step4: Sum all calories

Add the calories from each macronutrient:
$120 + 40 + 135 = 295 \text{ kcal}$

Answer:

Carbon, hydrogen, oxygen, and nitrogen

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Question 6