Exam 19: Life's Origin and Early Evolution

What is the strongest evidence for the idea that present-day eukaryotic aerobes are the descendants of the successful symbiotic association of anaerobes and aerobes?  

Laboratory simulations provide indirect evidence that organic compounds such as __________ and __________ self-assemble spontaneously under conditions like those thought to have prevailed on the early Earth.

A hypothesis currently getting a lot of attention concerning the origin of biological molecules is that they originated ____.  

What do the genetic comparisons among modern organisms indicate?  

Choose the proper item below for the following statements. -He/she provided experimental evidence for endosymbiosis.

-The area labeled "spark discharge" in the accompanying figure contained all of the following gases found in the ancient Earth atmosphere except:  

Choose the most appropriate statement that matches each term. -composite heritage

Which of the following is a rocky,layered structure that forms over time as a mat of aquatic prokaryotic cells traps sediments?  

A membranous sac that contains interacting organic molecules,hypothesized to have formed prior to the earliest life-forms:  

Four of the following were likely in Earth's earliest atmosphere.Which one was not?  

-The apparatus in the accompanying figure was used in the primitive Earth atmosphere simulation experiments performed by  

Choose the most appropriate statement that matches each term. -cyanobacteria

Which of the following is an underwater opening from which mineral-rich water heated by geothermal energy streams out?  

According to the endosymbiont hypothesis,eukaryotic cells evolved as a consequence of ____.  

The ozone layer is valuable because it blocks  

The accumulation of free oxygen in the atmosphere ____.  

Choose the proper item below for the following statements. -He/she created a laboratory-produced protocell consisting of a fatty acid membrane enclosing a clay particle that has RNA bound to its surface.

To learn more about the last common ancestor of all living things,scientists studied the genes that bacteria and ________ share.  

Life probably would never have emerged on Earth if the ancient atmosphere had been the same as the present one in regard to the content of ____.  

Analysis of genomes of modern species indicates that the first cells were similar to existing ____.