Question

4
select the correct answer from each drop - down menu.
complete the sentence relating to amino acids.
there ar amino acids in total, with of them being essential, which means that they can only be obtained from food.
(the drop - down menu for the first blank has options 30, 20, 10; there is also a reset button and a next button.)

Explanation:

To complete the sentence about amino acids:

1. For the total number of amino acids: In biological knowledge, there are 20 standard amino acids that are used to build proteins in living organisms.
2. For the number of essential amino acids: Out of these 20, 9 are essential for humans (they cannot be synthesized by the body and must be obtained from food). But looking at the dropdown options (assuming the second dropdown has options like 9, but since the first dropdown's correct total is 20, and common knowledge: total amino acids involved in protein synthesis is 20, and essential amino acids (for humans) are 9, but if the options for the second dropdown (not fully visible here) likely has 9 or similar, but first, the total is 20.

Wait, the first dropdown: the options are 30,20,10. The correct total number of amino acids (protein - forming) is 20. So first blank: 20. Then, the number of essential amino acids (for humans) is 9, but if the second dropdown (not shown here) has options, but based on standard knowledge: total amino acids (proteinogenic) is 20, essential amino acids (for humans) is 9 (but sometimes sources say 8 or 9, depending on age, etc.). But the first part: total amino acids (used in proteins) is 20.

So the first dropdown should be 20, and the second (assuming options) would be 9 (but since the second dropdown is not fully visible, but the first part: total amino acids is 20.

Answer:

First drop - down: 20 (There are 20 amino acids in total, with [number of essential, e.g., 9] of them being essential, which means that they can only be obtained from food. But for the first blank, the correct total is 20.)