<i>Arabidopsis</i> Plant (IMAGE) University of California - Davis Caption Studies on Arabidopsis plants like this six-week-old lab-grown specimen show that the genes of mitochondria and chloroplasts have a disproportionate effect on cellular metabolism compared to the far more numerous nuclear genes. Credit Baohua Li, UC Davis Usage Restrictions May be used with acknowledgement of the source. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.