Life extension: a has been achieved in the laboratory. b is not possible because natural selection cannot weed out disease-causing alleles that have an effect only after reproductive age. c can be achieved in species by selectively breeding individuals with the earliest age of maturity. d both the first and third choices are true. e all of the above.

answer: glucoamylase presented optimum activity at temperature of 55â°c, and, in the glycosidic bonds from the non-reducing ends of starch, resulting in the production of glucose. source and type of fermentation can affect the enzyme's properties

credit to kalahira

both male and female gametes are produced by meiosis of the germ cells. therefore, both male and female gametes are haploid. one male and one female gamete unite during the fertilization to form the diploid zygote. in seed bearing plants, pollen grain is the male gametophyte, which produces sperm cells.