Download Practice Questions for Second Hour Exam

Dr. Karowe
Biology 151
Organismal Biology
Winter 2002
Practice Questions for Second Hour Exam
NOTE: The actual exam will probably have about 40-45 questions. Approximately 90% of exam
questions will be from material covered in lecture.
Part I: True or False Questions.
1. When we say that two species are closely related, it means that one of them evolved from the
other.
2. Present evidence suggests that life on Earth first arose approximately 545 million years ago.
3. Allopolyploidy can result in the formation of a new species in a single generation.
4. In nature, directional selection is probably more common than diversifying selection.
5. Both Porifera and Platyhelminthes have a gastrovascular cavity.
6. Approximately 250 million years ago, all continents on Earth were together in a single land
mass called Pangea.
7. The most accurate phylogeny will be one in which species are grouped together based on
shared primitive characteristics.
8. A radially symmetrical animal that has two embryonic germ layers probably belongs to the
phylum Cnidaria.
9. Of the phyla covered in lecture, the first phylum to evolve mesoderm is the Nematoda (note:
"phyla" is the plural of "phylum").
10. It is generally accepted that the evolution of more complex internal anatomy was greatly
facilitated by the evolution of mesoderm and a true coelom.
Multiple choice: choose only the single best answer.
11. In a population with two alleles that are at Hardy-Weinberg equilibrium, the frequency of the a
allele is 0.4. The frequency of heterozygote individuals in this population will be:
a. 60%
b. 48%
c. 40%
d. 36%
e. there is too little information to tell
12. Which of the following statements is/are consistent with the punctuated equilibrium theory of
evolution?
a. evolution is a slow, gradual process that occurs at a fairly constant rate over time
b. within most lineages of animals, long periods without substantial evolutionary change
are interrupted by short periods of rapid change
c. an adaptive radiation of mammals occurred in only 5-7 million years following the mass
extinction that ended the reign of the dinosaurs
d. sharks have remained relatively unchanged for over 300 million years
e. both b and c are consistent with the theory of punctuated equilibrium
13. In which of the following sequences are taxonomic categories listed from smallest to largest?
a. phylum, class, order, genus, kingdom
b. species, genus, class, phylum, kingdom
c. species, genus, class, order, family
d. family, class, phylum, order, kingdom
e. kingdom, phylum, class, family, genus
14. Which of the following statements about Platyhelminthes is/are true?
a. they are acoelomate
b. they include flukes and tapeworms
c. they are the most primitive phylum to have true tissues
d. a and b
e. a, b, and c
15. Which of the following statements about protostomes and deuterostomes is/are true?
a. protostomes have spiral and determinate cleavage
b. in deuterostomes, the embryonic blastopore becomes the mouth
c. deuterostomes include molluscs, arthropods, and sea stars
d. a and b
e. a, b, and c
16. Which of the following statements about molluscs is/are true?
a. the basic mollusc body plan includes a foot, mantle, and visceral mass
b. torsion is a shared derived character of the Gastropoda
c. bivalves use their gills for respiration
d. unlike other molluscs, cephalopods have a closed circulatory system
e. all of the above statements are true
17. Which of the following represent evolutionary innovations that distinguish arthropods from
annelids?
a. segments have been combined through the process of tagmosis
b. appendages that are jointed
c. an exoskeleton made of chitin
d. b and c
e. a, b, and c
18. Which of the following statements about insects is/are true?
a. they belong to the subphylum Chelicerata
b. they are arthropods
c. they are the most successful form of animal life on Earth
d. b and c are both true
e. a, b, and c are true