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Science final 2019
| Question | Answer |
|---|---|
| The amount of guanine in an organism always equals the amount of | Cytosine |
| The scientists credited with establishing the structure of DNA are | Watson and Crick |
| Purines and pyrimidines are | Classification groups of nitrogen bases |
| A nucleotide consists of | a sugar, a phosphate group, and a nitrogen base |
| Which of the following is not found in RNA? | Thymine |
| During transcription, | RNA is produced |
| The enzymes that unwind DNA during replication are called | DNA helicases |
| Which of the following is not part of a molecule of DNA? | Ribose |
| Trisomy is a mutation that results in a cell having an extra | Chromosome |
| Adenine: thymine:: | Guanine : cytosine |
| In RNA molecules, adenine is complementary to | Uracil |
| If nondisjunction occurs, | A gamete will receive too many or too few copies of a chromosomes |
| The part of the molecule for which DNA is named is the | Sugar |
| RNA differs from DNA in that RNA | Contains the nitrogen base uracil |
| Transcription, which is a stage of gene expression, is the process by which genetic information encoded in DNA is transferred to a | RNA molecule |
| Molecules of DNA are composed of long chains of | Nucleotides |
| An organism that has an usually large effect on an ecosystem is called a | Keystone species |
| What do all the biotic and abiotic factors in a given area make up? | An ecosystem |
| Almost all autographs get their energy from | Sunlight |
| A group of organisms of the same species that live in the same area is called a | Population |
| Which process is part of the hydrologic cycle? | Evaporation |
| An ecologist counts weeds to monitor their populations. Which of the following best describes the ecologistâs methods? | Observation |
| Which organisms help convert gaseous nitrogen into ammonia in the nitrogen cycle? | Bacteria |
| Which phrase best describes biodiversity? | The number of species in an ecosystem |
| Herbivores are which of the following? | Primary consumers |
| Organisms that feed on dead or decaying matter are called | Detritivores |
| Which of the following provide most of the energy in ecosystems? | Producers |
| A major regional or global community of organisms is called | A biome |
| Which model shows the number of organisms at each trophic level in an ecosystem? | Pyramid of numbers |
| Which of the following does not represent a population? | All the birds in Chicago, Illinois |
| The world human population is presently | More than 6 billion |
| Which of the following is not an example of a predator-prey relationship? | A flea biting a dog |
| Vaccines have contributed to human population growth by | Lowering the death rate |
| One of a few species that has no predator in nature is the | Killer whale |
| Which is a biotic factor that affects population size? | Food |
| As the density of a population increases, the effects of starvation and disease also often increase. These are which kind of factors? | Density-dependent |
| Which of the following is not an abiotic factor that affects population size? | Human impact |
| A species that is critical to an ecosystem because the species affects the survival and number of many other species is known as a | Keystone species |
| As a population reaches its carrying capacity, resources become more scarce. Which of the following would increase within the population? | Competition |
| Most animals are both | Predators and prey |
| Which of the following usually results when members of the same species require the same food and space? | Competition |
| If the niches of two organisms overlap, | The organisms may have to complete directly |
| High biodiversity often helps make an ecosystem more | Resilient |
| Better sanitation, hygiene, and disease control have had which effect on the human population? | Decreased the death rate |
| Which does a functioning aquarium not display? | A niche |
| A group of organisms of different species living together in a particular place is called a | Community |
| Physical location : habitat :: | Function : niche |
| In which of the following could one not reasonably measure biodiversity? | Population |
| Succession occurs | As a previously existing community is replaced |
| The kinds of species that live in certain areas are determined largely by | Climate |
| In biomes where precipitation is low, most organisms have adaptions to | Conserve water |
| At least half of the worldâs species of land organisms live in a | Tropical rain forest |
| Which biome receives the most precipitation on average? | Taiga |
| A bayou is an example of a | Wetland |
| Which type of organisms would you expect to inhabit a wetland? | Water-loving plants |
| The diverse regions in the worldâs bodies of water are called | Aquatic ecosystems |
| Which of the following is a decomposer? | Worm |
| Taxonomy is | The science of naming and classifying organisms |
| An advantage of our scientific naming system is that | Biologists can communicate regardless of their native languages |
| All scientific names of organisms must be | Unique and have two latin words |
| Linnaeusâs two- word system for naming organisms is called | Genus species |
| In the Linnaean system of classification, the level that identifies one unique organism is the | Species |
| Under the Linnaean system of classification, plants and animals are sorted into groups based on | Form and structure |
| The largest division that a group of organisms can belong to is a | Domain |
| Placement in each level of classification is based on | Shared characteristics |
| Similar genera are grouped into a | Family |
| Analogous structures | Perform the same function in organisms |
| Traditional systematics emphasizes the importance of | Similar characteristics |
| Similar features that evolve through convergent evolution are called | Analogous characters |
| Convergent evolution produces analogous characters in different species as the result of | Similar environments |
| A phylogenetic tree differs from a cladogram in that a phylogenetic tree | Only illustrate hypothesized relationships among groups of organisms |
| Studies of fossils of dinosaurs and birds show that | Feathers may not be an important difference between dinosaurs and birds |
| A model used by biologists to represent evolutionary history among species is called a | Cladogram |
| Derived characters are traits | Found in closely related species |
| During Linnaeusâ time, scientists divided all living organisms into | Two kingdoms |
| Which of the following terms is no longer used to describe a group of organisms in the modern classification | Monera |
Created by:
Zoietaylor