Which statement is an accurate description of genes?

The bobolink is a small blackbird that nests in fields of tall grass. It breeds in the summer across much of southern Canada and the northern United States. It migrates long distances, wintering in southern South America. The numbers of these birds are declining due to disruption of the areas where they live. In order to save these birds from extinction, the best course of action would be to

A child with cystic fibrosis has an altered protein in his cells that stops chloride ions from leaving the cells. This protein most likely affects the functioning of

Which row in the chart below shows a direct relationship that can exist between two living organisms?

Scientists have studied the return of plant life on Mount St. Helens ever since the volcano erupted in 1980. Wildflowers began colonizing the area, followed by shrubs and small trees. Scientists predict that it will likely take hundreds of years before the area returns to a forest dominated by fir and hemlock trees. These changes are an example of

The most likely result of completely removing carbon dioxide from the environment of a plant is that sugar production will

Before a new shopping center can be built on previously undeveloped land, the builders must submit a proposal to the local government for approval. Which statement identifies an environmental concern associated with the development of the shopping center?

Homeowners have been encouraged to learn how to identify invasive plants and to remove them if they find them. The most likely reason for removing invasive plants is to

Which row in the chart below correctly pairs a human activity with its impact on the environment?

The diagram below represents some steps in a procedure used in the field of biotechnology. This bacterial cell can now be used to produce

The graph below represents the number of brown and green beetles collected in a particular ecosystem. The change observed in the number of green and brown beetles in the population is most likely due to

A reproductive system is represented in the diagram below. Which structure is correctly paired with its reproductive function?

For centuries, humans have used resources from coastal areas and open ocean waters. An example of an activity that would promote the conservation of coastal areas and ocean resources is

Which activity would eventually result in a stable ecosystem?

Some states require shoppers to pay a deposit on certain beverage containers made of plastic and glass. When shoppers return the containers, their deposits are returned to them. How is this system intended to help the environment?

The diagram below represents a food web. Which level contains organisms that carry out autotrophic nutrition?

Mad cow disease is a fatal disease that destroys brain tissue. Researchers have found that a prion protein, which is an abnormally constructed molecule, is responsible. Which statement best describes the characteristics a protein must have to function correctly?

The diagram below represents the results of the net movement of a specific kind of molecule across a living cell membrane. The movement of molecules from side A to side B is an example of the process of

Several companies now offer DNA “banking services,” where DNA is extracted from a pet and is stored so that a “replacement pet” might be produced using cloning techniques when the original pet dies. Which statement best explains why the replacement pets that are produced in this way might not look or act like the original?

It is recommended that people avoid excessive use of tanning beds. Exposure to the radiation emitted by tanning beds can cause skin cancer. This cancer is the direct result of a

The diagram below represents a developing fetus in a human. What would most likely happen if structure X were damaged in the early stages of pregnancy?

The reproductive structure in a female mammal that produces sex cells is the

Fungi are decomposers that play an important role in the maintenance of an ecosystem. The role of fungi is important because they

In 2011 and 2012, scientists working on the Banana River in Florida recorded a dramatic increase in the number of manatee deaths. Over the past 50 years, this area has also seen the human population increase by more than 500,000 people. It is believed that pollution from numerous sewage tanks leaked into the water, eliminating the manatees’ food source, replacing it with an alga that is toxic to the manatee. This is an example of

A student performed an experiment to see if water temperature affects the level of activity in aquatic snails. The student set up four tanks with five snails in each tank. All four of the setups were identical in every way, except for the temperature of the water. In order to make the conclusions more valid, the student could

The following events occur during sexual reproduction:

A. mitosis

B. meiosis

C. fertilization

D. birth

Which sequence represents the correct order of these events during sexual reproduction?

A broad body of evidence, subject to revisions, supported by different kinds of scientific investigations and often involving the contributions of scientists from different disciplines is necessary to develop

The diagrams below represent portions of two genes that code for leaf structure in the same species of clover. Gene 1 was taken from the cells of a clover plant with 3 leaves and gene 2 was taken from the cells of a clover plant with 4 leaves. The clover plant having gene 2 (4 leaves) was most likely the result of

Increased concern over the number of heatrelated illnesses among football players has led to a possible change in uniform design. Shoulder pads were designed that constantly blew cool, dry air underneath the shoulder pads. Tests showed that the use of the device during rest and recovery periods resulted in a reduction of body temperature and heart rate. This new device would help the athlete to

A student wanted to investigate the effect of light on the rate of ripening of tomatoes. She set up four pots of the same size with identical amounts of soil, water, and type of tomato plants. Each plant was exposed to a different intensity of light as shown in the table below. To report the final results, which label would be most appropriate for the third column of the data table?

A student wanted to investigate the effect of light on the rate of ripening of tomatoes. She set up four pots of the same size with identical amounts of soil, water, and type of tomato plants. Each plant was exposed to a different intensity of light as shown in the table below. The independent variable in this experiment is the

The diagram illustrates activities taking place in the body of a human. Vaccinations usually stimulate the body to produce more of

The diagram illustrates activities taking place in the body of a human. Which structure normally stimulates an allergic response?

Which population in the chart below has the best chance for survival in a rapidly changing environment?

The table below represents a segment of a DNA molecule found in a stomach cell, both before and after undergoing replication. Which statement best describes a change that would most likely be observed in the cells formed as a result of this mitotic division?

The setup below shows four test tubes. Tube 1 contains water only. Tube 2 contains a live snail. Tube 3 contains a live green water plant. Tube 4 contains both a live green water plant and a live snail. In this setup, which tubes contain at least one organism carrying on cellular respiration?

The setup below shows four test tubes. Tube 1 contains water only. Tube 2 contains a live snail. Tube 3 contains a live green water plant. Tube 4 contains both a live green water plant and a live snail. Which compound that directly provides energy in living cells is being produced in every tube where cellular respiration is occurring?

The concentration of a specific antibody in the blood of an individual was measured at various times over a period of 50 days. The results obtained are shown in the data table below. The antibody level (in arb. units) of the individual on day 30 is closest to

If a Chihuahua with short hair has a hidden gene for long hair, it can produce both long-haired and short-haired puppies when bred to a Chihuahua with long hair. A Chihuahua is born having a trait that is different from either of its parents. A possible explanation for the difference is that the Chihuahua puppy

The diagram represents a technique used by scientists today to maintain the genetic makeup of an organism. Which graph below best represents the DNA content found in each cell in each of the stages in the diagram above? (look at the chart below and choose the answer, don't click the chart)

The diagram below represents evolutionary pathways of seven groups of organisms alive today. Which two living species would be expected to have the most similar proteins?

Scientists recently discovered that three different types of squid, a marine animal, previously thought to be three different species, were actually all members of one species. Their earlier ideas were based on using squid carcasses (dead bodies). The new, more accepted classification is most probably based on an analysis of

The diagram below represents a laboratory experiment involving sucrose and water molecules in a cellophane bag which functions in the same way as dialysis tubing. Which statement correctly explains the rise of liquid in the tube at the end of the experiment?

The diagram below that shows variations in the beaks of finches in the Galapagos Islands and on your knowledge of biology. Which row correctly pairs a finch species with its primary nutritional role and bill type? (look at the chart and choose the answer, don't pick the chart)

Progressive Resistance Exercise

Progressive resistance exercise (PRE) is a method of increasing the ability of muscles to generate force. The principles of PRE for increasing force production in muscles have remained unchanged for almost 60 years. These principles are (1) to perform a small number of repetitions until fatigued, (2) to allow sufficient rest between exercises for recovery, and (3) to increase the resistance as the ability to generate force increases. Traditionally, PRE has been used by young, healthy adults to improve athletic performance. A student decided to incorporate PRE into his exercise program. He did not know how to determine when he had allowed sufficient rest between exercises for recovery. He hypothesized that waiting for his pulse to return to normal would probably be a good indication. Students wanted to try PRE to increase their ability to rapidly squeeze a clothespin. They thought if they could do this, they could challenge another class to a clothespin squeezing competition and win. Which steps should the students take to follow the principles of PRE?

Progressive Resistance Exercise

Progressive resistance exercise (PRE) is a method of increasing the ability of muscles to generate force. The principles of PRE for increasing force production in muscles have remained unchanged for almost 60 years. These principles are (1) to perform a small number of repetitions until fatigued, (2) to allow sufficient rest between exercises for recovery, and (3) to increase the resistance as the ability to generate force increases. Traditionally, PRE has been used by young, healthy adults to improve athletic performance. A student decided to incorporate PRE into his exercise program. He did not know how to determine when he had allowed sufficient rest between exercises for recovery. He hypothesized that waiting for his pulse to return to normal would probably be a good indication. Students following the principles of PRE monitored their ability to lift weights. Which observation would indicate that their exercise program was successful?