Chromosomes are thread-like structures located inside the nucleus of animal and plant cells. Each chromosome is made of protein and a single molecule of deoxyribonucleic acid (DNA). Passed from parents to offspring, DNA contains the specific instructions that make each type of living creature unique.
X-Men Origins: Wolverine. Hugh Jackman unsheathes the claws once again as he plays the fan-favorite mutant Wolverine in X-Men Origins: Wolverine, opening May 1, 2009.
Mark Ruffalo as the Hulk, left, Chris Evans as Captain America, Robert Downey Jr. as Iron Man, Jeremy Renner as Hawkeye, Scarlett Johansson as Black Widow and Chris Hemsworth as Thor in Avengers: Age of Ultron. (Marvel).