Refer to the illustration above. Unlike the sand dollar, the paramecium does not have to maintain a stable internal environment.

Units of time are not measured in metric units, so time measurements are not accepted for use with SI units.

A cell is the smallest unit that can carry on all the processes of life.

During telophase, a nuclear envelope surrounds each new set of chromosomes.

Specific homeoboxes control the morphogenesis of specific parts of an adult organism.

The two major ideas that Darwin presented in The Origin of Species were that evolution occurred and that natural selection was its mechanism.

Genetic drift may result in homozygosity for a gene that may make a population susceptible to extinction because it does not confer advantages, and it can also “fix” advantageous genes in a population.

Two hypotheses suggested about the rate at which evolution proceeds are gradualism and punctuated equilibrium.

Lucy’s skeleton revealed that she walked on four legs.

The evolutionary history of hominids is clearly established and agreed upon by scientists.

Neanderthals are members of the species Homo sapiens.

The first word of a scientific name identifies the kind of organism within the genus.

A virus can only reproduce by controlling a cell.

Cassava is a starchy root that is the staple food of more than 500 million people around the world.

Pollen is produced in the tip of the stamen, an area called the sepal.

The P_fr form of phytochrome is the one that induces phytochrome-mediated responses in plants.

Animals with open circulatory systems do not transport respiratory gases in their circulatory fluid, while animals with closed circulatory systems do.

In cnidarians, nutrients are propelled through a gut that runs the length of the body by the movement of water as the animal swims.

Some fossil amphibians had bony plates and armor covering their bodies.

Waterproof skin is a reptilian adaptation to life on land.

Most pathogens can readily pass through mucous membranes.

The first stage of urine formation is called reabsorption.

Most of the activity of the cerebrum occurs in its gray matter.

Myelin sheaths slow down nerve impulses by forcing them to jump from node to node.

Sperm are produced and mature in the testes.

The terms base and alkaline refer to solutions that

Which of the following is not an organic macromolecule?

Molecules that are too large to be moved across a cell membrane can be removed from the cell by

The sun is considered the ultimate source of energy for life on Earth because

During the third stage of photosynthesis, carbon-containing molecules are produced from

A change in a gene due to damage or being copied incorrectly is called

The finches that Darwin studied differed in the shape of their beaks. According to Darwin, the finches probably

When comparing Homo habilis and Homo erectus, we find that

burning fossil fuels : atmospheric carbon dioxide ::

photosynthetic bacteria : sunlight::

           

Refer to the illustration above. The structure that contains small pieces of DNA is labeled

The tissue of the leaf mesophyll that is located directly below the upper epidermis and consists of tightly packed column-shaped cells is the

If all copepods died,

Which of the following is not a food source for sea stars?

Which of the following does a contour feather most closely resemble?

Today all monotremes and most marsupials live in Australia and New Guinea. This limited distribution is due to

     

Refer to the illustration above. In the diagram, the compact bone is labeled

Refer to the illustration above. Which of the structures in the diagram are composed mainly of dead cells?

Each alveolus

When the diaphragm and rib cage muscles relax,

John and James are identical twins. During the summer following their fifteenth birthday, they went on a vacation and stayed in a cabin with two of their cousins. One of the cousins came down with chicken pox in the middle of the vacation. Chicken pox is caused by a virus. Two weeks later, John came down with chicken pox. James, however, never developed any symptoms of the disease. Which of the following is the best explanation for the different responses John and James had to exposure to the same disease?

Fat molecules are broken down into fatty acids by

Urine, when compared with the initial filtrate, contains

     

Refer to the illustration above. Eggs mature in the structure labeled

Which of the following body systems is affected by long-term tobacco use?