Advertisement Upgrade to remove ads

Sexual Reproduction

reproduction involving the union or fusion of a male and a female gamete

Asexual Reproduction

process by which a single parent reproduces by itself


cell division in which the nucleus divides into nuclei containing the same number of chromosomes


(genetics) cell division that produces reproductive cells in sexually reproducing organisms


(biology) the structural adaptation of some body part for a particular function


(biochemistry) a long linear polymer found in the nucleus of a cell and formed from nucleotides and shaped like a double helix


(biochemistry) a long linear polymer of nucleotides found in the nucleus but mainly in the cytoplasm of a cell where it is associated with microsomes


(genetics) the organic process whereby the DNA sequence in a gene is copied into mRNA


(genetics) the process whereby genetic information coded in messenger RNA directs the formation of a specific protein at a ribosome in the cytoplasm


(genetics) the process whereby DNA makes a copy of itself before cell division

Amino Acid

organic compounds containing an amino group and a carboxylic acid group

Base Pairing Rules

The rules stating that cytosine pairs with guanine and adenine pairs with thymine in DNA, and that adenine pairs with uracil in RNA.


The building block of a nucleic acid, consisting of a five-carbon sugar covalently bonded to a nitrogenous base and a phosphate group.


makes up the sides of the DNA ladder with deoxyribose


an essential structural component of living cells and source of energy for animals

Nitrogen Base

a DNA nucleotide containing nitrogen, a sugar molecule, and a phosphate group

Please allow access to your computer’s microphone to use Voice Recording.

Having trouble? Click here for help.

We can’t access your microphone!

Click the icon above to update your browser permissions above and try again


Reload the page to try again!


Press Cmd-0 to reset your zoom

Press Ctrl-0 to reset your zoom

It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.

Please upgrade Flash or install Chrome
to use Voice Recording.

For more help, see our troubleshooting page.

Your microphone is muted

For help fixing this issue, see this FAQ.

Star this term

You can study starred terms together

NEW! Voice Recording