5 Written questions
3 Matching questions
- sl millers classic experiment demonstrated that a discharge of sparks through a mixture of gases could result in the formation of a large variety of organic compounds. all of the following gases were used in this experiment EXCEPT:
E. water vapor
- which of the following best supports the statement that mitochondria are descendants of endosymbiotic bacteria-like cells?
A. mitochondria and bacteria possess similar ribosomes and DNA
B. mitochondria and bacteria possess similar nuclei
C. glycolysis occurs in both mitochondria and bacteria
D. both mitochondria and bacteria have microtubules
E. neither mitochondria nor bacteria possess chloroplasts
- a species is defined as
A. a population of organisms similar in size shape and color
B. a group of organisms that live in the same habitat
C. a population of organisms that are able to interbreed
D. a population of organisms that have the same # of chromosomes
E. a population of organismss with a common ancestor
- a C
- b D
- c A
5 Multiple choice questions
5 True/False questions
how does artificial selection produce rapid changes in the phenotype of organisms?
A. by changing the frequency of alleles and selecting for new combinations of traits
B. by stimulating the species to increase the production of new mutations
C. by changing the number of chromosomes
D. by selecting only dominant genotypes
E. by allowing individuals with all genetic combinations to survive and reproduce equally → B
A LARGE POPULATION OF LAB AANIMALS HAS BEEN ALLOWED TO BREED RANDOMLY FOR A NUMBER OF GENERATIONS. AFTER SEVERAL GENERATIONS, 49% OF THE ANIMALS DISPLAY A RECESSIVE TRAIT aa THE SAME PERCENTAGE AS AT THE BEGGINING OF THE BREEDING PROGRAM. THE REST OF THE ANIMALS SHOW THE DOMINANT PHENOTYPE, WITH HETEROZYGOTES INDISTINGUISHABLE FROM THE HOMOZYGOUS DOMINANTS.
what proportion of the population is probably heterozygous Aa for this trait?
E. 0.21 → D
permafrost; temperatures range from approximately -50c to 25c. growing season of 60 days or less
A. tropical rain forest
C. arctic tundra
D. temperate grassland
E. desert → D
How does natural selection affect the frequency of mutations?
A. under conditions of high selection pressure, beneficial mutations occur more frequently.
B. natural selection doesnt affect the frequency of mutations
C. all mutations increase when selection pressure is high
D. when there is no selection pressure, mutations do not occur
E. mutations occur less frequently when selection pressure is high → B
fossils of some intermediate forms have not been found because
A. new types of organisms can appear suddenly without progressive changes determined by natural selection
B. fossils are very rare; fossils of only a small fraction of species have been found
C. all fossils are the same age
D. species produced by punctuated equilibrium do not leave fossils
E. the ages of many fossils are not calculated correctly → B