Molecular clocks are usually calibrated based on  

Archaea are resistant to damage by harsh conditions because their membrane lipids, unlike those of bacteria and eukaryotes, have 

The difference between an akinete and endospore is that 

The three phylogenetic trees shown here all contain the same members and all have a common ancestor, but are divided up in three different ways. Which tree has members circled that are of more than one evolutionary line and does not include the most recent common ancestor of the included lineages? What type of group is this?

Microcystis aeruginosa is a species of cyanobacteria.  What is least likely to be true of this species?

Since they differ from other living organisms by lacking a discrete nucleus and many other cell inclusions, bacteria and archaea are more closely related to one another than archaea is to eukaryotes.

Can two different species that are members of the same clade have more than one common ancestor? Choose the MOST correct answer and explanation.  

Which of the following is NOT true of horizontal gene transfer?

Why is it always necessary to check solutions when solving radical equations?

Two online companies sell similar products and are competing for increased market share. One of the companies is less honorable so they hire an attacker who launches an attack to make the other company appear less trustworthy and thus a less favorable option from which to buy. What type of attack did the malicious actor most likely launch?