What macromolecule is the primary energy source for organisms?

Compare actions of cocaine amphetamines and nicotine

A geneticist found that s particular mutation had no effect on the protein coded by a gene. What do you think is the most likely type of mutation in this gene? and why?

Bacteria in the soil converts this nutrient into a usable form. Plants take up the usable nutrient through the soil and assimilate it into proteins, making it part of the plant. An animal eats the plants, and the nutrient becomes part of the animal.

What is the starchy material inside seeds that provides nutrients for the embryonic plant called?

Which of the following does not have an impact on Earth's climate? a. the movement of the ocean b. greenhouse gases c. burning fossil fuels d. none of the above

This was once a forested hillside. The county where this hill is located decided to widen the roads in the area. All of the trees and shrubs were cut down.

Some animals can produce a potassium ion concentration inside their cells that is twenty times greater than that of their environment. This ion concentration gradient is maintained by the plasma membrane.

Why are animals more likely than plants to form new species while still in the presence of the parent population?

Which is true about scientific knowledge? A. It is rarely proven wrong. B. It is not based on observation. C. It is agreed upon by all scientists. D. It changes as new evidence is found.

Which is a result of selective breeding? a. Large seedless watermelons that consumer demand. b. Oranges that are all different sizes and colors. c. An insect that can carry ten times its body weight. d. A bird that catch prey with its beak.