When a student adds a few drops of diluted picric acid to a paramecium slide, he observes that the paramecium releases some transparent spine-like projections to protect its body from the acid. what is the significance of these projections?
a. the projections are trichocysts, released for the self-defense of the paramecium.
b. the projections are pseudopodia, released for the locomotion of the paramecium.
c. the projections are cilia, released for the locomotion of the paramecium.

The model illustrates a process by which a substance is taken up by a cell

The first signs of cellular differentiation occur in the blastocyst. why is cellular differentiation important for the development of a fully formed human infant?

Approximately 90% of all cases of polycystic kidney disease are inherited in an autosomal dominant fashion. the disease is typically related to mutations to genes (pkd1 and pkd2). pkd genes can be found on chromosome 16. the disease occurs in approximately 1: 800 to 1: 1000 people. here is a hypothetical example. the dominant allele d will cause the development of pkd. the recessive allele is known as d. what genotypes would correspond to suffering from pkd? dd, dd what genotypes would correspond to being normal (not suffering from pkd)? dd consider that 1: 1,000 people have pkd in your population of 325million. consider that pkd is inherited in an autosomal dominant fashion. show you math for all of the following questions: what is the genotypic frequency for dd? what is the genotypic frequency for dd? what is the genotypic frequency for dd? what is p? what is q? how many people in your population would have pkd?