全部 and 全体: all the parts and the whole
Distinguish every item without exception from something considered as a whole.
Referring to every item
全部 is read ぜんぶ and refers to everything within the relevant scope. 「宿題は全部終わりました」 means that all the homework is finished.
「全部で五千円です」 means that the total is five thousand yen. 全部で indicates the combined total, not that each item costs five thousand yen.
Viewing something as a whole
全体 is read ぜんたい and refers to the whole scope or overall form comprising the parts. 「町全体が静かです」 says that the whole town is quiet.
「文章全体の流れを確認します」 means checking the flow of the text as a whole. It considers the relationships and structure formed by the sentences, not just one sentence.
Reading everything and viewing the whole
「資料を全部読みました」 describes reading all the materials. 「資料全体の構成を見ました」 describes looking at their overall structure, without necessarily reading every detailed sentence.
Even when 全部 and 全体 cover a similar scope, their combinations with verbs and nouns differ. Learn expressions such as 全部で for a total and 全体の for overall structure or atmosphere.
Does 「全部は読んでいません」 mean that not a single line has been read?
Show the answer and why
Not necessarily. It means that not everything has been read; some may have been read. Do not conclude that nothing was read.