#Question id: 11147
#XL - T Zoology
The concentrations of ions are very different inside and outside a nerve cell due to ________.
#Question id: 4765
#XL - R Botany
The recessive mutant allele that causes cystic fibrosis is much more frequent in Caucasians population than in other world populations. Some scientists believe heterozygotes must have had a survival advantage during plagues such as cholera that occasionally swept through this population. What concept does this illustrate?
#Question id: 4601
#XL - T Zoology
DDT was once considered a "silver bullet" that would permanently eradicate insect pests. Instead, DDT is largely useless against many insects. Which of these would have prevented this evolution of DDT resistance in insect pests?
#Question id: 5566
#XL - T Zoology
In some rare salamander species, all individuals are females. Reproduction relies on those females having access to sperm from males of another species. However, the resulting embryos receive no genetic contribution from the males. Why do you think sperm are necessary for reproduction?
#Question id: 18549
#XL - R Botany
Sugar yielding part of sugarcane is