Atlas of plant and animal histology

Choose true or false. Each right answer scores 1, and each wrong answer scores -1. Not answered questions score 0.

1) Fixation is intended to preserve the morphological and molecular features of tissues.

2) There is a universal fixative for any type of tissue and technique.

3) The penetration power of a fixative is a main feature for a fixative to be chosen.

4) The mordant effects of a fixative allow a better preservation of the lipidic compounds of tissues.

5) An artifact during the fixation process allows a better observation of some tissular structures.

6) There are fixatives that are not chemical compounds.

7) Fixation by perfusion consists of the immersion of the sample in fixative solutions.

8) The fixation time of the perfusion method is longer than the time of the immersion one.

9) Fixation by immersion allows fixing larger samples than fixation by perfusion.

10) Fixatives can be combined to make more versatile fixative solutions.

11) The best fixative for nucleic acids is acetic acid.

12) One of the most widely used fixatives is paraformaldehyde.

13) Tissues to be observed with the electron microscope need to be processed with alcohols.

14) The Bouin fixative solution contains picric acid.