Quotes interrupt the flow of your text. Only quote if the precise wording is absolutely critical. If you must quote, incorporate 2-3 lines into the text. Longer quotes should be isolated by single spacing and wider margins. If an entire paragraph comes from a certain author, cite once at the end of that paragraph, not after every thought or sentence.
Scientific writing is formal communication.
Don't use conversational language, colloquialisms or slang. Read your paper out loud, or, better, have a friend read it to you. These words should almost never be used in a biology lab report. Your experiment is very limited in scope and will only provide evidence for or against a hypothesis. Use parallel constructions in a series.