Exam 2 Flashcards
Which of the following is NOT a major source of genetic diversity in organisms?
A-Mutation; B-Non-random mating; C-Genetic drift; D-All of the above; E-None of the above
E
Which best describes a change to the DNA sequence of an organism?
A-Bottleneck; B-founder effect; C-Recombination; D-Mutation; E-Natural Selection
D
Assortative mating produces more homozygotes, and inbreeding is an extreme example.
True
Large populations are more susceptible to genetic drift altering their genotype frequencies.
False
What is the best term for describing advantages in survival and reproduction?
Fitness
Which type of natural selection would produce a trait over time with less variation?
Stabilizing
Which of the following is FALSE about prokaryotes?
A-Includes archaea & bacteria; B-No nucleus; C-circular DNA; metabolically diverse; D-None
E
Bacteria are a type of prokaryote with peptidoglycan cell walls and only 1 RNA polymerase.
True
Which of the following would you not find in protistans?
A-Unicellular photoheterotroph; B-Unicellular chemoheterotroph; C-colonial photoautotroph; D-multicellular photoautotroph; E-colonial chemoautotroph
E
What molecule is fixed by photosynthesis to produce sugars?
Carbon Dioxide
What molecule provides the electrons to replace those lost from chlorophyll during light reactions?
Water
A chemoautotroph gets its carbon from carbon dioxide and its energy from inorganic molecules.
True
Which two groups of organisms are entirely chemoheterotrophs?
Fungi & Animals
Which two groups of organisms have cells surrounded by cell walls?
plants and fungi
Which two types of metabolism involve acquiring energy from sunlight?
photoautotroph & photoheterotroph
Describe external and internal fertilization
fertilization occurs outside of an organism (external); fertilization occurs within an organism (internal)
Characteristics of animals
diploid, gonochoristic or hermaphroditic; external or internal fertilization; symmetry; chemoheterotrophs, muscles and nerves, short lived gametes, long embryonic development
What are the 3 embryonic tissue layers of a triploblastic animal?
endoderm, ectoderm, mesoderm
Jellyfish Characteristic
Cnidocyte
Flatworms
Acoelomate
S-shaped movement
nematodes
Eucoelomate; segmented; bilateral symmetry
Annelida
Triploblastic; acoelomate, bilateral symmetry
Platyhelminthes
No tissues; vaselike; feeding layer internally
Porifera
