Chapter 19: Self-Quiz Our best estimate for the age of Earth, 4.5 billion years, is supported by the assumption of uniformitarianism the Big Bang theory gradualism punctuated equilibrium radioactive dating of the oldest rocks found There was no free oxygen in the early atmosphere because all of it was tied up in water ammonia methane rock radioactive isotopes RNA became a candidate for the first information-carrying molecule when Tom Cech and Sidney Altman discovered that some RNAs can act as enzymes that degrade proteins turn light into chemical energy split water and release oxygen gas synthesize copies of themselves synthesize amino acids The exoskeleton of early, marine-dwelling arthropods can be considered a preadaptation for life on land because it can support an animal's weight against the pull of gravity allows a wide diversity of body types resists drying absorbs light both a and c The evolution of the shelled, amniotic (membrane-enclosed) egg was an important event in vertebrate evolution because it led to the Cambrian explosion was the first example of parents caring for their young allowed the colonization of freshwater environments freed organisms from having to lay their eggs in water allowed internal fertilization of eggs The Big Bang occurred approximately ______ years ago, according to scientists. 100 million 100 thousand 1 billion 15 billion 50 billion The first living organisms were probably autotrophic, aerobic bacteria heterotrophic, anaerobic bacteria autotrophic algae heterotrophic zooplankton autotrophic phytoplankton Eukaryotic cells evolved about _________ years ago. 4.5 billion 3.5 billion 1.4 billion 600 thousand 10 thousand Which of the following are major adaptations that allow birds and mammals to have a more active life style than reptiles? internal fertilization high, constant body temperature insulation over body surface internal fertilization and high, constant body temperature high, constant body temperature and insulation over body surface All of these are potential problems for organisms that dwell on land rather than water, except dessiccation light availability union of sex cells body support movement The first terrestrial animals probably were arthropods amphibians reptiles mycorrhizae mammals These primitive fish, called _________, were probably the ancestors of both modern bony fish and ________. lobefins, reptiles lobefins, amphibians sharks, amphibians trilobites, salmonella trilobites, reptiles Which arthropod characteristic "preadapted" them to life on land? multiple legs compound eyes exoskeleton open circulatory system antennae Which of these set primates apart from other mammals? placental young mammary glands grasping hands parental care of young tree-dwelling Designed in cooperation with Andrew Stull and Steven Brunasso. Last Update - July 25, 1997 © Prentice-Hall, Inc. A Simon & Schuster Company Upper Saddle River, New Jersey 07458 Legal Statement
Designed in cooperation with Andrew Stull and Steven Brunasso. Last Update - July 25, 1997
Last Update - July 25, 1997
