BioRender might be a good option (https://biorender.io/)
It's an online app that contains a library of pre-made cells, proteins, membrane shapes, organs, lab equipment, etc. that you can drag-and-drop so you don't have to spend time drawing each element of the figure yourself.
Saves a lot of time for creating schematic figures, and the icons are all created by trained scientific illustrators so they're both beautiful and accurate. It's also free for educational use.
You can also get some nice images (bacteria, cell membrane, proteins, DNA) to use them as templates from here: http://www.somersault1824.com/library-of-science-illustrations/
I would recommend any software, which is vector-based (meaning you can scale your drawings up and down without loosing quality) and can export into standard image file formats. For that I would recommend Inkscape.
If you need your biological diagrams of bacterial invasion pathway for a paper or a thesis, you have plenty of good suggestions here. However, if you are going to prepare a talk, perhaps you could consider to hand-draw your own diagrams, take a picture, and include it in the presentation!
I have seen some very good presentations with nicely done hand-drawings. This brings the idea of lab-book draws, study draws or work-in-progress draws.
Try "BioDraw Ultra" software... That software was a big help when demonstrating signaling pathways and cell organelles in presentations.... They even provide a two week-free trial.
I would like to add my support to that above by Gustavo Acevedo-Hernandez
http://www.somersault1824.com
It is free to join and they have a great library of images ready for downloading. If there is something that you wish to have drawn you can suggest the image and it will be generated for free if it is chosen.
Why do all the hard work when somebody extremely skilled has the ability to do this for you! I have used images from the website very recently and it really does make your slides look great compared to the basic tools offered in standard programs such as powerpoint etc.
Thanks for your time and excellent suggestions! I need to do a d relatively simple scheme in paper quality, involving early stages of bacterial invasion and signaling cascades involved on it. I will use some of your suggestions. Once again, thanks a lot
hello Mr. Quintero. i suggest you use from the software like Cinema4D or Bioblender that help to Biology animation making, if you install it's plug-ins!
BioRender might be a good option (https://biorender.io/)
It's an online app that contains a library of pre-made cells, proteins, membrane shapes, organs, lab equipment, etc. that you can drag-and-drop so you don't have to spend time drawing each element of the figure yourself.
Saves a lot of time for creating schematic figures, and the icons are all created by trained scientific illustrators so they're both beautiful and accurate. It's also free for educational use.