A scientist analyzing an unknown substance has determined that it consists of carbon, hydrogen and oxygen. During experimentation, she determines that the substance is soluble in oil but not in water. She thinks the structure matches the image below:

Which of the following groups contains only molecules that are assembled from smaller organic compounds?

Use the diagrams to answer the question. The diagram shows the concentration of different molecules across a lipid bilayer. Which numbered diagram or diagrams represent active transport?

Which property of water helps organisms survive in lakes during cold winters?

The picture shows a student's experiment with Elodea, a common aquatic plant. Which change in this experiment is most likely to increase the volume of oxygen gas that accumulates in the top of the tube?

A sports physiologist was monitoring athletes to determine at which point their muscles began to work under anaerobic conditions. The best way to test for this would be to check for a buildup of

The diagram below shows a chloroplast and some of the components of the reactions that occur in chloroplasts. Which of the following is a product of the reactions that take place in a chloroplast?

Since the 1960s, the human population in Florida has grown from approximately 5 million to greater than 18 million persons. The Florida population is estimated to continue to grow and reach approximately 24 million by 2040. The Forever Florida Project and Project 2000 have been purchasing and managing land since 1990. How might state land acquisition and management benefit the environment and Florida citizens?

The cell theory was first proposed in 1838. Evidence obtained through additional scientific investigations resulted in the current cell theory. Which statement describes a component of the original cell theory that was removed because of the new scientific knowledge?

People who have Alzheimer€™s disease experience an increasing loss of brain function and cognition over time. Alzheimer€™s is characterized by a buildup of abnormal protein fragments that damage brain cells. Recently scientists have discovered an enzyme, BACE2, that decreases these abnormal protein fragments in the brain of a person with Alzheimer€™s disease. Which statement explains how BACE2 most likely works?

The enzyme amylase begins reacting with starch during the chewing of food. When the food enters the stomach, amylase is no longer active and starch decomposition stops. When the food leaves the stomach and enters the small intestine, starch decomposition continues again. Why is amylase inactive in the stomach?

Environmentalists in Florida are concerned about offshore drilling in the Gulf of Mexico MAINLY because the drilling might lead to

Which of these does NOT support the Cell Theory?

A high respiratory rate usually indicates that a person’s body needs more

On March 24, 1989, an oil tanker ran aground on Bligh Reef in Prince William Sound, Alaska, and spilled millions of liters of crude oil. The graph shows pink salmon populations in Prince William Sound from 1970 to 1999. What do these data suggest about the effect the oil spill had on pink salmon?

A farmer plows a field of grass to plant crops. Which population of animals will most likely be impacted the greatest from the habitat change?

A cell is placed in a solution with a salt concentration much higher than the cell cytoplasm. What will most likely happen to the cell?

When comparing temperatures of two California regions of the same latitude, students found that the nighttime temperature dropped significantly at the desert site but only slightly at the coastal site. What causes this difference?

A molecule with a structure composed primarily of amino acids would be classified in which of the following groups?

Zebra mussels were introduced into the lakes and rivers of the United States when ballast water from ships arriving from overseas was discharged into them. The zebra mussels have few predators in this country, and in some places, such as areas of shallow water, they cover the lake or river bottoms almost completely. If you had taken a census of the native species of fish in a lake both prior to and following the arrival of zebra mussels, how would you expect your census to change after the zebra mussels became established?

Which Correctly matches the cell process to the organelle in which it occurs?

The leaves of green plants contain openings known as stomata. A plant opens and closes its stomata to exchange gases between the plant and the surrounding environment. Which of the following is most likely to occur when a plant's stomata open?

Sophia produces the graph shown below during a biology class investigation. What could she infer about the probable difference between the original reaction and Reaction B, based on the data?

Which of the following organelles releases energy from sugars?

Life on Earth is made possible by the unique characteristics of water. One of those characteristics is the role of water in the regulation of the temperatures of organisms and the environment. Which of these statements best describes the characteristic of water that impacts its role in temperature regulation?

The picture shows a student using a microscope to study a prepared slide of a single-celled organism. A single-celled organism can be classified as a prokaryote based on the absence of.........

Cellular respiration and photosynthesis both require an energy source. What is the energy source for cellular respiration but not for photosynthesis?

For many years, many people associated stomach ulcers with eating spicy foods. Later research showed that a particular bacterium living inside the highly acidic environment of the stomach produced a coating that attacked the stomach lining. This process led to the formation of stomach ulcers. These findings sent researchers looking for an antibiotic that could treat the problem bacteria. Subsequent studies found a host of antibiotics that effectively treat the bacteria and lead to the healing of the ulcers. Which of the following best illustrates the scientific process?

Some types of "investigations" claim to be scientific in nature, but lack some of the sound scientific practices that meet the criteria for science. Which of the following examples does not meet the criteria for scientific practices and may be addressed outside of the realm of science?

A student hypothesized that lettuce seeds would not germinate (sprout) unless they were exposed to darkness. The student planted 10 lettuce seeds under a layer of soil and scattered 10 lettuce seeds on top of the soil. The student found that 9 of the seeds under the soil sprouted, while 8 of the seeds left on top of the soil sprouted. Which of the following would most likely allow the student to improve the validity of these results?

Before digging a new coal mine, a company wants to develop policies to help maintain the quality of the local environment. Which factor should the company track to help meet this environmental goal?

In astrology, personality traits are linked to a person's birthday. According to astrology, personality traits are related to the positions of the Sun, Moon, and planets at the time of a person's birth. Which statement explains why the field of astrology is NOT considered science?

A botanist is trying to determine the best medium for growing new juvenile orchids. He collected data on the four different types of media that were used to grow the juvenile orchids, as shown in the table below. Based on the data, which medium would be best for growing juvenile orchids?

A diagram of ocean zones is shown below. Marine organisms adapted to the coldest temperatures and the highest salinity levels would inhabit which zone?

The average depth of the oceans is about 4300 meters (m). Why do most of the marine organisms live in the top 200 m of the ocean waters?

Which of these molecules is a nucleic acid?