Your papers are to adhere to the form and style required for the Journal of Biological Chemistry, requirements that are shared by many journals in the life sciences.
However, use complete sentences and do not sacrifice readability for brevity.
You can keep it concise by wording sentences so that they serve more than one purpose.
"Biology lab #1" would not be an informative title, for example. In a minute or less a reader can learn the rationale behind the study, general approach to the problem, pertinent results, and important conclusions or new questions.
Write your summary after the rest of the paper is completed.
Our research papers are not typical "lab reports." In a teaching lab a lab report might be nothing more than answers to a set of questions.
Such an assignment hardly represents the kind of writing you might be doing in your eventual career.
To this end, many journals require the following sections, submitted in the order listed, each section to start on a new page. Some journals call for a combined results and discussion, for example, or include materials and methods after the body of the paper.
The well known journal does away with separate sections altogether, except for the abstract.
It is not to be a step by step description of everything you did, nor is a methods section a set of instructions. By the way, your notebook should contain all of the information that you need for this section.
Materials: The page length of this section is set by the amount and types of data to be reported.