In general, books on Biology and related areas are given call numbers in Q (Life Sciences), R (Medicine), S (Agriculture), or T (Technology).
Q Science (General)
QH Natural History & Biology
QK Botany
QL Zoology
QM Human Anatomy
QP Physiology
QR Microbiology
R-RZ Medicine
S Agriculture (General)
SB Plant Culture
SD Forestry
SF Animal Culture
SH Aquaculture and Fisheries
TP 248.13 — TP 248.65 Biotechnology
For a more detailed breakdown see: https://www.loc.gov/catdir/cpso/lcco/