Why can't a damaged cell in the brain be replaced?

Which statement best describes an operon? a. several genes, next to each other in eukaryotic DNA, that are transcribed as a single piece of mRNA b. a single gene in prokaryotic DNA that is transcribed as a single piece of mRNA c.

In the last 100 years, which of the following have added excess carbon dioxide to the atmosphere? a. power plants b. machinery c. cars d. All of the above

How does deforestation affect the water cycle? A. It increases the amount of percolation. B. It increases the amount of transpiration. C. It increases the amount of runoff. D. It increases the amount of precipitation.

Santa's elves are creating treat bags containing a selection of kit kats, reese's cups and almond joys. (a) how many different types of bags can they make containing 8 chocolate bars.

Where do the majority of earthquakes in the United States occur?

The mechanism of urine formation involves three processes: filtration, reabsorption, and secretion. Primary urine is formed by filtration from the blood.

This tree was constructed by comparing sequences of homologs of a gene that plays a role in development; Drosophila was used as an outgroup.

What is one main difference between the cell wall and the cell membrane?

Agrobacteriuminfects plants and causes them to form tumors. You are asked to determine how long a plant must be exposed to these bacteria to become infected.

How do oozes differ from abyssal clay? Discuss how productivity, destruction, and dilution combine to determine whether an ooze or abyssal clay will form on the deep-ocean floor