Questions and answers by

sam. Williams

Questions (151)

The International Panel on Climate Change is a group of scientists from many countries who study and monitor the temperature of
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The food web below represents the interactions between organisms in a salt marsh ecosystem and organisms in an old field
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The graph below shows the percentage of seeds that germinate after being in cold storage for a varying number of days. Some
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Genetic engineering involves both ethical and scientific issues. Which of the following is not an ethical factor in pursuing
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A trait for flower color shows incomplete dominance, where heterozygous individuals have pink flowers. If a homozygous dominant
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Examine the illustrations of the two bird feet shown below. In what types of environments would such feet have a selective
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A group of well-separated islands in the Pacific Ocean has a population of hibiscus plants that produce either orange or white
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Modern scientists have observed that genetic changes happen over time in all natural populations. Therefore, by comparing amino
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The cell membrane helps control solute flow into and out of the cell. How does a substance that moves by passive transport tend
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Water is often called the “universal solvent” because it can dissolve many different kinds of substances. What kinds of
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A biochemical reaction occurs with the course of action being the reactants on the left and the products on the right of a
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A student made the drawing of ATP shown below. How is this molecule most often involved with the production of energy in a cell?
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In the carbon cycle, cellular respiration is the process responsible for the conversion of carbon-containing sugars into carbon
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Which of the following pairings shows a substance released during cellular respiration and the cellular structure that is
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What is the correct equation for cellular respiration? (SC.912.L18.9) *1 point 6O₂ + C₆H₁₂O₆ --> 6CO₂ + 6H₂O + ATP
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What are the subunits that make up complex carbohydrates? (SC.912.L.18.1) *1 point amino acids fatty acids monosaccharides
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In 1985, a researcher in Antarctica noticed that ozone levels in the atmosphere seemed to be as much as 35 percent lower than
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There is a general pattern in how environmental workers and activists overcome environmental problems. Which lists five steps of
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A renewable resource is a natural resource that can be replaced at the same rate at which the resource is used. Which of the
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The diagram below is an energy pyramid. In what level is there the least energy available? (SC.912.L.17.9) *1 point Captionless
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Noxious weeds are weeds that invade ecosystems and grow very quickly and aggressively. In Colorado, more than 1 million acres
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The United States experienced a rapid growth of its population of in the early 1900s. Which of the following factors did not
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Tropical rain forests receive as much as 450 cm of rain per year. They are the richest biome in terms of number of species.
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Rivers and the aquatic life that live within them can change over time due to human activity and natural forces. Which of these
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The following chart shows the number of 2n chromosomes in various organisms. Which series lists the number of chromosomes in
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The diagram below shows the process of cell division. Which of the following statements about the process is correct?
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Which of the following correctly describes the stages of early human development in the correct order? (SC.912.L.16.13) *1 point
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A consumer asked a genetic scientist whether genes from a genetically modified food plant could possibly cause harm by
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According to the genetic code, the mRNA codons UGU and UGC code for the amino acid cysteine, the mRNA codon UGA is a stop codon,
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Cancer is one of the leading causes of death in the United States. Which of the following best describes cancer?
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The diagram below shows the processes that occur during gene expression. At which step would transfer RNA (tRNA) be necessary?
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The base sequences below show two different sequences of the same gene. What type of mutation is illustrated? (SC.912.L.16.3) *1
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During replication, a double-stranded DNA molecule opens up exposing the bases on each strand. Complementary bases line up with
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The Punnett square below shows a cross between two rabbits. Black fur (B) is dominant to brown fur (b). What would be the
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A parent that is heterozygous for two different traits (AaBb) can pass any combination of two alleles (AB, Ab, aB, or ab) to its
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Crossing over is an important step in meiosis. Which best explains how crossing over increases genetic variation?
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Immigration to the United States in the 1800s from Eastern Europe is an example of which type of force for genetic change?
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In a population of clover flowers, there are both white and purple varieties. The cows that graze the field where the clovers
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Which hominid trait allows individual's to have hands free for tool use? (SC.912.L.15.1) *1 point Spine Opposable thumbs Larger
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According to the primordial soup model, the first organic molecules could have formed from simpler inorganic substances in
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Scientists used to group fungi with plants. Which of the following is a major factor that determines why fungi are not
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Today, biologists classify sponges as animals rather than plants. What evidence supports today’s classification?
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A new animal was discovered in a remote area of Southeast Asia. The animal seemed to resemble a crocodile. Biologists have
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A species of toad living in an area is similar in form to toad fossils found in very old rock. Which hypothesis does this
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In the past, smallpox, which is caused by a virus, was a common and deadly disease. Now, people no longer get smallpox. Which
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The picture below models a blood vessel carrying different components of blood. If human blood did not contain component C,
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e diagram below shows the major parts of the human brain. What is part D? (SC.912.L.14.26) *1 point Captionless Image cerebellum
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Which statement best describes the structure and function of phloem cells? (SC.912.L.14.7) *1 point They are cells that
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AIDS is a fatal disease caused by HIV, a virus that attacks and destroys the human immune system. Which of the following
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Advancements in which of the following pieces of technology allowed scientists to make new discoveries about materials on an
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Which could be found in a prokaryote? (SC.912.L.14.3) *1 point endoplasmic reticulum flagellum mitochondrion nucleus
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Sodium-potassium pumps, endocytosis, and exocytosis all involve active transport. Which of the following is a characteristic of
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The careful observations of many scientists have resulted in the development of the cell theory. Which of the following is not
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A newspaper headline says, “Detective Has Theory on How Computers Were Stolen from Warehouse.” Which of the following words
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A theory is a set of related hypotheses that have been tested and confirmed many times by many scientists. Which of the
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Every year, monarch butterflies travel thousands of miles from their summer homes in northern states and Canada to wintering
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Darwin’s theory of evolution was criticized fiercely during his time. Modern scientists now accept the theory while they still
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The graph below is from an experiment where total light exposure was adjusted for three groups of rats. Each group had 12 rats
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A botanist has recently developed an enzyme called NoGro. This enzyme acts as an herbicide by preventing cell growth in the
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It may seem obvious to people living in the modern world that disease is caused by germs or pathogens, but germ theory took
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A scientist wants to investigate male-guppy behavior in the presence of female guppies. She puts two long tailed guppies in the
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What types of organisms are eventually connected to everything living thing in an ecosystem?decomposers producers scavengers
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Animals that eat other animals areProducers Autotrophs Heterotrophs Prey
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What process do autotrophs undergo to create their own food?photosynthesis cellular respiration
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What is the ultimate source of energy for living thins on Earth?Sun Moon Mitochondria Oxygen
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Using the image below of a marine food web, answer the following question: Which of the following correctly describes how the
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Click and drag the trophic levels of an energy pyramid in the correct order. Organisms at the bottom of the pyramid should be at
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Chemosynthesis relies on chemical energy in the environment. The fact that no large organisms are known to undergo
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Chemosynthesis relies on which energy source?(1 point)Responses chemical chemical nuclear nuclear thermal thermal light
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Do both animal and plant cells have mitochondria? Why or why not?(1 point)Responses Yes; they both need mitochondria to convert
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Read the following statement and choose the correct option from the dropdown menu for each blank.(2 points)Chemical energy input
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What can be used to measure primary productivity in an ecosystem?(1 point)Responses carbon dioxide consumption carbon dioxide
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Which of the following is the best evidence that supports the rule that only 10% of energy is transferred from one organism to
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The ultimate or starting source of energy for most organisms on Earth is(1 point)Responses the sun. the sun. carbon dioxide.
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The following diagram shows a typical food pyramid:If 100,000 kJ of energy is available to the producers, how much energy is
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Use the image below to answer the question.In the image, which animal is a tertiary consumer? (1 point) Responses mouse mouse
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As energy is passed through the food chain, some of the energy is lost as heat. What is the approximate amount of energy that is
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What is the major difference between the position of producers and primary consumers in the food chain?(1 point)Responses
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Which activity improves soil health?(1 point)Responses composting composting applying herbicides applying herbicides removing
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What is the correct term for organisms that consume other living organisms in order to gain matter and nutrients?(1 point)Respon
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In 1-2 sentences, explain why there are so many less individual organisms at the level labeled "5" than there are at the level
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With liquid water underneath its icy surface, Jupiter’s moon Europa is often cited as a potential site for extraterrestrial
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Suppose you are an exterminator of organisms that undergo chemosynthesis. Which technique will prove most effective to eliminate
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Which organism provides evidence that matter and energy can be cycled through an ecosystem without sunlight?(1 point)Responses a
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Which extremophile produces enzymes used in the production of detergents?(1 point)Responses alkaliphiles alkaliphiles anaerobes
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Which compound can provide the energy for chemosynthesis?(1 point)Responses hydrogen sulfide hydrogen sulfide water water oxygen
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The energy that organisms use for supporting life processes such as movement and reproduction are released into the ecosystem as
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Which statement is the most accurate regarding the first stage of photosynthesis?(1 point)Responses Sugar molecules like glucose
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Where does the light-dependent stage of photosynthesis occur in the plant cell?(1 point)Responses cytoplasm cytoplasm
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Evaluate the following statement and pick the option that correctly argues why this statement is incorrect."Anaerobic and
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In eukaryotes, cellular respiration takes place in the(1 point)Responses mitochondria. mitochondria. cellular membrane. cellular
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How do producers play a part in the recycling of matter?(1 point)Responses Producers make glucose in the absence of light.
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A fungus is an example of a(1 point)Responses decomposer. decomposer. photosynthesizer. photosynthesizer. producer. producer.
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Which statement is true?(1 point)Responses Anaerobic respiration produces glucose from lactic acid and energy. Anaerobic
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Aerobic respiration is(1 point)Responses an inefficient cellular respiration process that produces large amounts of energy. an
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Radiant energy is also called(1 point)Responses light energy. light energy. chemical energy. chemical energy. cellular energy.
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Primary productivity is defined as(1 point)Responses the overall amount of energy captured by plants and other photosynthetic
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Energy transfer is inefficient between trophic levels because(1 point)Responses molecules are fully digested from each trophic
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Scientists are looking to determine the primary productivity of a lake by analyzing its oxygen net primary productivity. How are
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Methylmercury biomagnifies in an ecosystem, meaning its concentration __________ as it moves through each higher trophic
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