Which of the following is the correct order of structures that the sperm must penetrate to fertilize the secondary oocyte?
A) Corona radiata, oocyte plasma membrane and zona pellucida B) Zona pellucida, corona radiata and oocyte plasma membrane C) Corona radiata, zona pellucida and oocyte plasma membrane D) Oocyte plasma membrane, zona radiata and corona pellucida
Which of the following would NOT provide evidence for a genetic basis for aging?
A) Children of short-lived parents live shorter lives than children of long-lived parents. B) Cells only divide for a set number of divisions. C) Cell lines become nonfunctional before their maximum number of divisions is reached. D) Smoking and excessive alcohol intake are linked to shorter life spans. E) Certain genes that code for antioxidant enzymes to detoxify free radicals are present in animals that live longer. Since smoking and alcohol consumption are not genetic factors they would not provide a genetic basis for aging. They can, however, act to increase the affects of aging.