Biology: Science for Life with Physiology

Colleen Belk, Virginia Borden Maier

Chapter 13

The Greatest Species on Earth? - all with Video Answers

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Chapter Questions

Problem 1

How many different species have been identified by science? How many are estimated to exist?

Marisa A

Marisa A

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Problem 2

Plants experienced an adaptive radiation after the evolution of the flower. Explain what occurred and list the hypotheses that may explain why it occurred.

Marisa A

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Problem 3

How are hypotheses about the evolutionary relationships among living organisms tested?

Marisa A

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Problem 4

Which of the following kingdoms or domains is a hodgepodge of different evolutionary lineages?
A. Bacteria; B. Protista; C. Archaea; D. Plantae; E. Animalia

Jonathan Temple

Jonathan Temple

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Problem 5

How would biologists test evolutionary relationships across a large range of phyla?
A. by comparing the DNA sequence of genes that are highly divergent between different species; B. by comparing the DNA sequence of genes that have adopted different functions in different species; C. by comparing morphological rather than genetic traits; D. by comparing the DNA sequence of conserved genes; E. $A, B,$ and $D$ are correct.

Marisa A

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Problem 6

You discover a new monocellular organism that has a nucleus and contains chlorophyll. This organism must be
A. plant; B. eukaryote; C. protist; D. algae; E. B, C and D

Jonathan Temple

Jonathan Temple

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Problem 7

Chloroplasts are
A. probably derived from a prokaryotic ancestor; B. probably derived from an algae-like protist; $C$. the site of photosynthesis; D. likely to be phylogenetically younger than mitochondria; E. A, C, and D

Jonathan Temple

Jonathan Temple

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Problem 8

Fungi feed by
A. producing their own food with the help of sunlight;
B. chasing and capturing other living organisms; $C$. growing on their food source and secreting chemicals to break it down; D. filtering bacteria out of their surroundings; E. producing spores.

Jonathan Temple

Jonathan Temple

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Problem 9

Which of the following is/are always true?
A. Viruses cannot reproduce outside a host cell; B. Viruses are not surrounded by a membrane; C. Viruses are not made up of cells; D. A and C are correct; E. A, B, and C are COrrect.

Jonathan Temple

Jonathan Temple

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Problem 10

Phylogenies are created based on the principle that all species descending from a recent common ancestor ____
A. should be identical; B. should share characteristics that evolved in that ancestor; $\mathbf{C}$. should be found as fossils;
D. should have identical DNA sequences; E. should be no more similar than species that are less closely related.

Jonathan Temple

Jonathan Temple

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