1. Why does a change in the structure of a protein matter? 2. Which would most likely have a more lasting effect?
A. a significant mutation to the DNA of a gene
B. a mutation to the mRNA transcribed from it

Which best explains why viruses do not have special structures or enzymes that allow them to make their own food? viruses can use energy in living cells that they infect. viruses can replicate inside a host that they infect. viruses can cause contagious illnesses in host cells. viruses integrate their rna or dna into infected cells.

Sampling lake water for microscopic organisms is not as easy as it sounds when you want to both count and identify species. in a given water sample, your bacteria of choice can be rare or difficult to culture, particularly given the mixture of bacteria in a biofilm. which of the following culture media would be best for growing fecal coliforms when they are relatively less abundant than other bacteria in the lake? anaerobic culture medium enrichment culture medium complex culture medium basic culture medium

What is the answer for the complicated molecules that make up living things usually contain carbon. why is carbon so important in these molecules?