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A function of cell membranes in humans is the*
Forests, mountains, rivers, and marshes are examples of the wide variety of ecosystems in New York State. The diversity of these ecosys- tems is most likely the result of*
The diagram below represents two organisms.
Which statement concerning organism A and organism B is correct?*
Which statement best describes the organelles in a cell?*
A substance directly involved in cellular commun- ication within the human body is*
The list below includes three organ systems that are directly used when a human runs.
circulatory system muscular system skeletal system
Which system should also be included in the list?*
In a pine forest, there are different species of birds known as warblers that are able to coexist on the same pine trees. The Cape May warblers feed on insects located on the tips of the highest pine branches. The yellow-rumped warblers feed on insects on lower branches of the same trees. The different feeding locations for these two species of warblers indicate that they have different*
The diagram below represents the locations of two mutations in a strand of a DNA molecule.
If this DNA is located in the nucleus of a skin cell, the cell will*
A human skin cell contains 46 chromosomes. A frog sperm cell contains 12 chromosomes. Which pair of numbers shows the chromosome number of a normal gamete from each of these species?*
According to the theory of biological evolution, most present-day species of organisms*
Corn seeds with identical genetic information were planted on two adjacent farms. The corn plants on one farm were well fertilized and grew large, while the plants on the other farm were not given fertilizer and did not grow as large. The best explanation for these observations is that*
The male red-winged blackbird defends its territory and uses loud vocalizations to attract a mate. Such behavior directly benefits these birds because it results in*
Extinction occurs when the environment changes and*
All the information necessary for growth, development, and eventual reproduction of sexually reproducing organisms is present in*
Which activity can occur without the use of energy?*