Ccr5 is a cell surface receptor protein of white blood cells that attracts them to specific tissue and organs to elicit an immune response. it is also the receptor to which r5 strains of hiv bind to and enter t cells. between 5-14% of people from northern european descent possess an allele known as ccr5-δ32. in this allele, a 32 base pair section of the gene has been deleted. what phenotype would you predict for people carrying the ccr5-δ32 allele?

The construction of phylogenetic trees is a mapping out the proposed divisions and common ancestors of all living species. traditionally, these trees have been built using morphological data, such as appearance and embryology. recently, it has been possible to construct these trees using molecular data. phylogenetic trees based on different types of information agree with each: that there is strong evidence of a real underlying common descent. this phylogenic tree is composed based on molecular data (rrna). what statements can we infer are true about the organisms throughout the tree? because the tree is rooted, all branches share a common ancestor. all organisms have some sort of cellular structure/organization. all eukaryotes evolved from bacteria. since the organisms contain rna, they share the same dna. if the organisms contain rna, the share the same four nitrogen bases.

What does it mean for a cell membrane to be selectively permable

What household products contain algae?