Taproot

In plants, the main root, which is typically the longest, and generally serves as an anchor for the plant.

Taxonomy

A classification system that lists organisms in an orderly fashion to show their relationship with respect to other organisms.

A sample taxonomic classification for humans would be:

Domain	Eukarya
Kingdom	Animalia
Phylum	Chordata
Subphylum	Vertebrata
Class	Mammalia
Order	Primates
Family	Hominidae
Genus	Homo
Species	Homo sapiens
Subspecies	Homo sapiens sapiens

Tendril

In plants, a slender climbing organ.

In the image to the left, which was found here, the tendril is the portion of the plant that goes up and to the right.

Thalamus

The part of the brain that deals with the perception of sensation.

Thymine

A nitrogenous base that pairs with adenine in DNA, and is replaced by uracil in RNA. When you see a string of letters that are used to describe DNA, such as AGTCCGTTATATTGC, "T" stands for thymine.

Transcription

The first step in protein synthesis where a copy of RNA is made from a portion of DNA.

Transfer RNA

Also known as tRNA. A type of RNA that bonds with amino acids and then takes them to a ribosome, which can then pair with an mRNA codon during the translation phase of protein synthesis.

Translation

The stage during protein synthesis where mRNA base sequences are converted into a sequence of particular amino acids in a new polypeptide chain.

Transovarial

Across or through the ovary. A term that refers to pathogens that are transmitted from a maternal organism to its offspring by the invasion of the ovary and the infection of the eggs.

Transpiration

The loss of water vapor from a plant's surface.

Triploblast

An organism that forms three distinct embryonic tissue layers, namely the mesoderm, the ectoderm, and the endoderm.

Triploid

A cell or organism that has three times the number of chromosomes found in a haploid version.

Tuber

In plants, a structure found at the end of a rhizome which becomes swollen, and acts as food storage. An example of a tuber would be a potato.

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