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Biology Practice Test #2

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Hemoglobin is a molecule that binds to both O2 and CO2. There is an allosteric relationship between the concentrations of O2 and CO2. Hemoglobin's affinity for O2

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All of the following are differences between prokaryotes and eukaryotes EXCEPT

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Destruction of all beta cells in the pancreas will cause which of the following to occur?

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Certain populations of finches have long been isolated on the Galapagos Islands off the western coast of South America. Compared with the larger stock population of mainland finches, these separate populations exhibit far greater variation over a wider range of species. The variation among these numerous finch species is the result of

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Which of the following statements about trypsin is NOT true?

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The Calypso Orchid, Calypso bulbosa, grows in close association with mycorrhizal fungi. The fungi penetrate the roots of the flower and take advantage of the plant's food resources. The fungi concentrate rare minerals, such as phosphates, in the roots and make them readily accessible to the orchid. This situation is an example of

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The base composition of DNA varies from one species to another. Which of the following ratios would you expect to remain constant in the DNA?

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Which of the following are characteristics of both bacteria and fungi?

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A chemical agent is found to denature all enzymes in the synaptic cleft. What effect will this agent have on acetylcholine?

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All of the following statements are true EXCEPT

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Chemical substances released by organisms that elicit a physiological or behavioral response in other members of the same species are known as

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The sliding action in the myofibril of skeletal muscle contraction requires which of the following?

I. Ca2+

II. ATP

III. Actin

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Hawkmoths are insects that are similar in appearance and behavior to hummingbirds. Which of the following is LEAST valid?

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Which of the following about meiosis is NOT true?

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A student is is conducting an experiment regarding transcription and notices that the mRNA found in the cytoplasm is much smaller than the original mRNA synthesized in the nucleus. This is due to the

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Which of the following is NOT a characteristic of asexual reproduction in animals?

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A sustained decrease in circulating Ca2+ levels might be caused by decreased levels of which of the following substances?

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Metafemale syndrome, a disorder in which a female has an extra X chromosome, is the result of nondisjunction. The failure in oogenesis that could produce this would occur in

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Crossing-over occurs during which of the following phases in meiosis?

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A change in a neuron membrane potential from +50 millivolts to -70 millivolts is considered

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Which of the following occurs before the other during reproduction

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Which of the following describes a symbiotic relationship?

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In cells, which of the following can catalyze reactions involving hydrogen peroxide, provide cellular energy, and make proteins, in that order?

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The liver is a vital organ that performs all of the following functions EXCEPT

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In minks, the gene for brown fur (B) is dominant over the gene for silver fur (b). Which set of genotypes represents a cross that could produce offspring with silver fur from parents that both have brown fur?

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Which of the following contributes the MOST to genetic variability in a population?

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The development of an egg without fertilization is known as

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The major difference between cartilage and bone is that cartilage

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Which of the following is the correct characteristic of arteries?

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The primary site of glucose reabsorption is the

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All of the following are stimulated by the sympathetic nervous system EXCEPT

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In humans, fertilization normally occurs in the

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In DNA replication, which of the following does NOT occur?

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Which of the following is used in intercellular communication between plants

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All of the following play an important role in regulating respiration in humans EXCEPT

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If a photosynthesizing plant began to release 18O2 instead of normal oxygen, one could most reasonably conclude that the plant had been supplied with

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All of the following are examples of hydrolysis EXCEPT

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In general, animal cells differ from plant cells in that animal cells have

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All viruses contain at least these two principal components. They are

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The energy given up by electrons as they move through the electron transport chain is used to

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