Which of the following is the best explanation for the presence of light-colored lizards in the White Sands region of New Mexico, when darker lizards live in the surrounding areas?

A healthy individual is a carrier of a lethal allele but is unaffected by it. What is the probable genotype of this individual?

A genetic disorder due to a recessive allele (a) is lethal in homozygous individuals (aa), whereas heterozygous individuals (Aa) have no symptoms. Based on this information, which of the following is likely to result?

What are the two main sources of genetic variation?

Mutations within a DNA sequence are

The diet of white-tailed deer consists primarily of shrubs. Sika are another species of deer that eat both grasses and shrubs. After a long drought, why might the Sika population be greater than the white-tailed deer population?

The evolution of new insect populations that are resistant to chemical insecticides illustrates the importance of what?

A small portion of a population that is geographically isolated from the rest of the population runs the risk of decreased

Complete burning of plant material returns carbon primarily to the

Which organisms are most critical in the nitrogen cycle?

Carbon is used to make sugars in which step of the carbon cycle?

Which of these organisms are most helpful in preventing Earth from being covered with the bodies of dead organisms?

The loss of which type of organism would cause all the other organisms to die as well?

Dead plants and animal wastes are broken down by

Which of these organisms would most likely be found at the top of an energy pyramid?

A farmer abandons one of his fields and over the years he notices that one community is replaced by another community. This is commonly called

In many parts of the United States, native plants that once grew on the forest floor have been replaced by garlic mustard, an invasive species that thrives in cool forest floors. This situation is an example of

The process of photosynthesis, transpiration, evaporation, condensation, respiration and excretion are all involved in the cycle of

Which diagram correctly represents the process of mitosis?

Mitosis is a process by which

A cell in the stem tip of a corn plant contains 20 chromosomes. After the cell divides, how many chromosomes should each resulting daughter cell contain?

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

The major atmospheric byproduct of photosynthesis is

Which of the following is the chemical equation that summarizes photosynthesis?

The X and Y chromosomes are known as

Meiotic cells are found in

The “father” of genetics is

What is the probability that the offspring of a homozygous dominant individual and a homozygous recessive individual will exhibit the dominant phenotype?

Mendel’s finding that the inheritance of one trait had no effect on the inheritance of another became known as the

For the given phrase, choose the type of molecule that is most closely associated with the phrase. “Contains the hereditary information passed on from one generation to next generations in humans.”

This diagram represents a molecule of

Which two scientists proposed the double helix arrangement of DNA?

The shape of the DNA molecule is described as a

What is the name of the group of a three nucleotide sequence in mRNA that specifies an amino acid?

What is the chain of amino acids called?

Which of the following is not true about DNA and RNA?

Which structure pairs with adenine during the formation of messenger RNA?

In nucleotides, the letters A, G, C, and T represent

In which part of the cell structure does transcription take place?

Which is the correct sequence of protein synthesis?

Carbon dioxide is produced as cells break down nutrients for energy. Which of the following pairs of systems would participate in removing the carbon dioxide from the body?

The respiratory system depends on the nervous system for signals to

The fight-or-flight response includes greater heart output and a rise in blood pressure. This response is due to

Which of these secretes a hormone that regulates the rate of metabolism of the body?

What is the greatest danger to a patient who has had damage to the skin?

Sweat and skin secretions contain a mixture of molecules that kills or limits the growth of many types of microbes. This control of microbes is an example of

The human body contains proteins in the blood that can recognize invaders such as bacteria or virus’ before they have a chance to attack. These proteins are collectively referred to as

The Sabin vaccine is a liquid containing weakened polio viruses. Vaccinated individuals become protected against polio because the weakened viruses

Which of the following require a host cell because they are not able to make proteins on their own?

How do human diseases caused by bacteria and diseases caused by viruses react to antibiotics?

Individuals with HIV sometimes contract a pneumonia infection that is rare in the rest of the population because people with HIV