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| Which is the smallest unit of life that can survive and reproduce on its own? |
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| The instructions in DNA are used to make |
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| The chemical processes in the living cell are collectively called |
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| Organisms designated producers usually obtain their energy from |
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| About 12 to 24 hours after the last meal, a person's blood sugar level normally varies from 60 to 90 milligrams per 100 milliliters of blood, although it may rise to 130 mg/100 ml after meals high in carbohydrates. That the blood sugar level is maintained within a fairly narrow range despite uneven intake of sugar is due to the body's ability to carry out |
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| Which domain(s) is(are) made up of organisms without nuclei? |
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| Members of which kingdom are multicellular producers? |
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| Of the following, which is the first explanation of a problem? It is sometimes called an "educated guess." |
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| To eliminate the influence of uncontrolled variables during experimentation, one should |
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| establish a control group identical to the experimental group except for the variable being tested. |
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| Four of the five answers listed below are characteristics of life. Select the exception. |
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| Which is the smallest portion of a substance that retains the properties of an element? |
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| The atomic weight (or mass) of an atom is determined by the weight of |
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| Which term includes the other four? |
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| molecules (atoms electrons protons elements) |
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| Which substance is NOT an element? |
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| The shape (or tertiary form) of large molecules is often controlled by what kind of bonds? |
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| The nucleotide most closely associated with energy is |
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| Four of the five answers listed below are carbohydrates. Select the exception. |
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| Archaea, Eukarya, and Prokarya |
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| These are the primary cellular sites for the production of ATP. |
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| chloroplasts and mitochondria |
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| These are the primary structures for the packaging of cellular secretions for export from the cell. |
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| Another word for biosynthetic is |
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| Although it is too simple an explanation, the concept of a key fitting into a lock is descriptive of the |
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| matching of enzyme with substrate. |
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Which affects the rate of diffusion through a semipermeable membrane?
I. steeper concentration gradients
II. higher temperatures
III. size of the molecule diffusing |
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| Movement of a molecule against a concentration gradient is |
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| . Plants need which of the following to carry on photosynthesis? |
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| Most carbon enters the web of life through |
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| Aerobes use ____ as the final electron acceptor in electron transport phosphorylation. |
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The correct operational sequence of the three processes listed below is:
I. glycolysis
II. electron transfer
III. Krebs |
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| results in the production of pyruvate and occurs in the cytoplasm. |
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| The chromosomes detach from one another and become visibly separated during |
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| Which of the following is the proper sequence for mitosis? |
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| Asexually produced daughter cells are |
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| identical to each other and identical to the mother cell. |
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| If a parent cell has 16 chromosomes and undergoes meiosis, the resulting cells will have how many chromosomes? |
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| . Crossing over usually occurs in which of the following stages of meiosis? |
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| In the pairing of two nucleotides within the double helix, |
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Definition
hydrogen bonds are used.
adenine and thymine bind together.
purines bind with pyrimidines.
double-ring nitrogenous bases connect to single-ring bases.
ALL OF THESE |
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| The DNA molecule could be compared to a |
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| The DNA molecule is usually made up of how many strands? |
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| The RNA molecule is made up of how many strands? |
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| How many different types of RNA molecules are needed to make protein? |
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| What is the form of RNA that carries the code from the DNA to the site where the protein is assembled? |
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| The nitrogenous base found in DNA but not in RNA is |
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| The synthesis of an RNA molecule from a DNA template strand is |
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| There are how many different kinds of amino acids in proteins? |
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| Which of the following needs an anticodon to bind to the protein synthesizing machinery? |
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| Amino acids are joined together in proteins by |
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| Fossils found in the lowest geological strata are generally the most |
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| The place Darwin visited on his trip around the world that had the greatest impact on his thinking was |
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| According to Darwin, natural selection is based on the ____ found in populations. |
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| Which of the following evolve? |
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| The maintenance of Hardy-Weinberg equilibrium is encouraged |
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| when there is no gene flow between different populations |
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| The introduction of a small population onto an island that results in a limited gene pool for a population best describes |
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| The sharp reduction of the gene pool and the numbers of a population through a severe epidemic is an example of |
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| The fossil record is incomplete because |
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Definition
very few organisms were preserved as fossils.
organisms tend to decay before becoming a fossil.
animals with hard parts are preserved more easily.
geological processes may destroy fossils.
ALL OF THESE |
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| Which of the following habitats is most likely to be rich in fossils? |
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| bed of former shallow sea |
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| Which of the following groups represents the most closely related organisms? |
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| The maintenance of Hardy-Weinberg equilibrium is encouraged |
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| Four of the five answers listed below have a common relationship. Select the exception. |
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| The primitive earth's atmosphere did NOT contain |
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is replicated independently from nuclear DNA.
transcribes some RNA and protein used by the mitochondrion.
has some codons that have a different meaning from those of nuclear DNA.
may have been the genetic instructions for an organism that lived symbiotically within a predatory form.
ALL OF THESE |
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| All prokaryotic cells have |
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Definition
is a normal inhabitant of the human intestinal tract.
produces conditions that prevent invasion by other bacteria.
enhances digestion, particularly the digestion of fats.
produces vitamin K.
all of these |
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| Which of the following statements concerning the bacterium E. coli is NOT true? |
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Definition
| it is capable of photosynthesis |
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| Viroids differ from viruses in that the former lack |
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| Mad cow disease is caused by a |
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| Despite their tolerance for harsh climates, lichens are particularly intolerant of |
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| The first group with flowers were |
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| All but which of the following would be associated with vascular plants? |
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| Which of the following is true of xylem? |
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| transports water and minerals |
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| Stomata are responsible for |
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Definition
| water escape from the leaves, carbon dioxide entry, and mineral absorption. |
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| The mosses and liverworts are members of which division? |
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| Ferns are more advanced than mosses because mosses lack which structure found in ferns? |
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| The conifers, such as pines and junipers, are examples of the |
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