- A hypothetical bacterium swims among human intestinal contents until it finds a suitable location on the intestinal lining. It adheres to the intestinal lining using a feature that also protects it from phagocytes, bacteriophages, and dehydration. Fecal matter from a human in whose intestine this bacterium lives can spread the bacterium, even after being mixed with water and boiled. The bacterium is not susceptible to the penicillin family of antibiotics. It contains no plasmids and relatively little peptidoglycan.In which feature should one be able to locate a complete chromosome of this bacterium?
- If all prokaryotes on Earth suddenly vanished, which of the following would be the most likely and most direct result?
- Some beetles and flies have antler-like structures on their heads, much like male deer. The existence of antlers in beetle, fly, and deer species with strong male-male competition is an example of ________.
- Which of the following involves metabolic cooperation among prokaryotic cells?
- Biologists sometimes divide living organisms into two groups: autotrophs and heterotrophs. These two groups differ in ________.
- You have found a new prokaryote. What line of evidence would support your hypothesis that the organism is a cyanobacterium?
- The most important feature that permits a gene to act as a molecular clock is ________.
- A key observation of ________ was that species of organisms on different islands were clearly similar, yet had distinct differences.DarwinLinnaeusMendel
- What is the most accurate method used to measure the age of a fossil?
- The Permian period ended and then rapid speciation occurred as new animal and plant forms evolved. The most likely explanation for this is ________.I)adaptive radiationII)ecological opportunityIII)lack of competitionIV)morphological innovation
- when do vertebrates make transition to land?
- What major innovations of the three radiations was associated with defying gravity to facilitate life on land?
- Which period had the greatest increase in the number of extant species?
- An early consequence of the release of oxygen gas by plant and bacterial photosynthesis was to ________.
- in protostomes, the blastopore becomes the
- Identify the factors necessary for evolution by natural selection.genetic based variation among individualsunlimited resourceschemicals in the environment
- in deuterostomes, the blastopore becomes the
- Scientists use shared biological components such as ________ to determine relationships among the three domains of life.
- Which of the following is (are) problematic when the goal is to construct phylogenies that accurately reflect evolutionary history?
- In order for ________ to occur, there must already be genetic based variation among individuals