Photosynthetic organisms were present when Earth was primarily anoxic. Why was the appearance of cyanobacteria critical for the oxidation of the atmosphere?

You want to conduct a series of experiments involving the Hawaiian bobtail squid, so you acquired a number of eggs to incubate them under controlled laboratory conditions. However, two days after the juveniles hatched from the eggs, you find that none of them is producing bioluminescence. Why?

According to the RNA world hypothesis, which of the following was the correct sequence of developments?

Metagenomics is a more sensitive analysis of community diversity than rRNA-based analyses because __________.

During an Escherichia coli-related outbreak of food poisoning on campus, 16S rRNA sequences were obtained from the stools of several infected students. Phylogenetic comparison of the sequences to those on file at the local health department and at the CDC can be used to do the following:

Greenhouse gases

Single-cell genomics may help us

What method would you use to identify nitrogen from biogenic origins in a sample from coastal waters?

When measuring microbial community metabolic activity, __________ is always necessary.

Why would it be an advantage for a primitive eukaryotic cell to form a mutualistic relationship with a prokaryote capable of aerobic cellular respiration?