The endosymbiotic theory to explain the origin of which structures?

a- mitochondria
b- ribosomes
c- nuclei
d- cell membranes

Which of the following describes a difference when gram-positive bacteria are compared to gram-negative bacteria?

In the ocean why are the greatest amount of primary producers found in the epipelagic zone and how does that affect biodiversity

Suppose a particular species of tulip plant has three alleles for the gene that codes for flower color. the cr allele produces red tulips, the cp allele produces purple tulips, and the cw allele produces white tulips. cr is dominant over cp and cw, and cp is dominant over cw. for each of the following crosses, determine the expected ratio of offspring for each flower color. cr cp x cp cw cr cw x cp cw 1 red: 1 purple : 0 white, 1 red: 2 purple: 1 white, 2 red: 1 purple 1 white, 1 red: 3 purple : 0 white, 2 red: 0 purple : 2 white, 2 red: 2 purple : 0 white