Exam 1: Introduction

It is hypothesized that mitochondria in eukaryotic cells evolved by endosymbiosis,when a larger cell ingested a smaller cell.If you were examining eukaryotic cells using a high-powered microscope,what evidence would you look for that would best support this hypothesis?

A biologist hypothesizes that the sounds made by lions at night in the Serengeti are territoriality calls and predicts that two lions inhabiting the same territory will roar even louder.She selects an area inhabited by one lion,records its calls,and plays them back in the same area.She records her observations,and notes that the lion does indeed roar more often as a result of this experiment.What would be the next step in the hypothesis-prediction method?

Use the following to answer questions : Refer to the figure below showing a tree of life. -If the estimates on the figure are accurate,then you can conclude that

Which of the following is classified as a living organism by biologists?

The initial accumulation of oxygen in the atmosphere was the result of photosynthesis from an organism most like modern

Genes are

One reason biologists consider viruses to be a part of life is that viruses

By studying yeasts,we can discover facts about human cells because yeasts and humans

The cells in your body

Which statement about the experiments of Tyrone Hayes on abnormalities of male frog sex organs is correct?

A phylogenetic tree

The sequencing of the human genome

A scientific hypothesis

Which question can be directly answered through controlled experiments?

A systems analysis approach to understanding how biological systems function is used to

Evolution is the change in the genetic makeup of

Which of the following is one of the key points in Darwin's explanation of evolution?

Which process would be most effective at preventing evolutionary change in a population of bacteria?

Darwin referred to the differential reproductive success of individuals with particular variations as

Despite numerous studies showing the negative effects of atrazine on frog development,the Environmental Protection Agency continues to allow restricted use of atrazine as long as environmental levels do not exceed 30 to 40 ppb.What will be the likely result of this policy?