Question

One of the _________in the final exam was tough.

problems

problem​

Answer 1

Answer:

Which of the following is not present in the cell of a bacteria

a. cell membrane

b. nuclear membrane

c. cytoplasm

d. none of these

Answer 2

$\sf\blue{One\:of\:the\:problems\:in\:the\:final\:exam\:was\:tough}$

Therefore your answer is problems