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1. Homologous structures are often cited as evidence for the process of natural selection. All of the following are examples of homologous structures EXCEPT
2. The sliding action in the myofibril of skeletal muscle contraction requires which of the following?
3. 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
4. Which of the following contributes the MOST to genetic variability in a population?
Questions 5-7 refer to the following information.A marine ecosystem was sampled in order to determine its food chain. The results of the study are shown below.Type of Organism Number of OrganismsShark 2Small crustaceans 400Mackerel 20Phytoplankton 1,000Herring 100
Questions 5-7 refer to the following information.
A marine ecosystem was sampled in order to determine its food chain. The results of the study are shown below.
Type of Organism Number of Organisms
Small crustaceans 400
5. Which of the following organisms in this population are secondary consumers?
6. Which of the following organisms has the largest biomass in this food chain?
7. If the herring population is reduced by predation, which of the following is most likely to occur in this aquatic ecosystem?
Questions 8-10 refer to the following information.To understand the workings of neurons, an experiment was conducted to study the neural pathway of a reflex arc in frogs.A diagram of a reflex arc is given below.
Questions 8-10 refer to the following information.
To understand the workings of neurons, an experiment was conducted to study the neural pathway of a reflex arc in frogs.
A diagram of a reflex arc is given below.
8. Which of the following represents the correct pathway taken by a nerve impulse as it travels from the spinal cord to effector cells?
9. The brain of the frog is destroyed. A piece of acid-soaked paper is applied to the frog's skin. Every time the piece of paper is placed on its skin, one leg moves upward. Which of the following conclusions is best supported by the experiment?
10. A nerve impulse requires the release of neurotransmitters at the axonal bulb of a presynaptic neuron. Which of the following best explains the purpose of neurotransmitters, such as acetylcholine?
Questions 11-13 refer to the following information.
11. Which of the following DNA strands would serve as a template for the amino acid sequence shown above?
12. If a mutation occurs in which uracil is deleted from the messenger RNA after methionine is translated, which of the following represents the resulting amino acid sequence?
13. The mRNA above was found to be much smaller than the original mRNA synthesized in the nucleus. This is due to the