Movement of molecular oxygen (O2) and carbon dioxide (CO2) across the cell membrane Choose one: A. occurs only unidirectionally, such that oxygen is allowed to enter and carbon dioxide (waste) is able to leave. B. only occurs when the O and C atoms are part of some other molecule (e. g., a sugar or amino acid). C. requires energy in the form of ATP or the proton motive force. D. occurs passively, but membrane transporters are required to facilitate their movement. E. occurs by passive diffusion.

1. variations in a population of moths allow for some of its members to be able to adapt to environmental changes. the better adapted of the moths will be able to survive the change and thus prevail as the “fittest” of the species. (a) describe three mechanisms in which variation can occur within a species population. (b) explain which mechanism or mechanisms would be responsible for the survival of a population of peppered moths better than white moths in an environment affected by industrial soot. justify your answer.

In tomato plants, mendel found that the allele for smooth seeds (s) is dominant, while the allele for wrinkled seeds (s) is recessive. which of these punnett squares shows crosses between two plants heterozygous for smooth seeds? i need this to be answered as soon as ! sry the picture is bad quality

What processes would you expect to be key in the production of yogurt ?