What does population density measure?

1. the different species in a community

2. the area occupied by a population

3. the number of individuals in a sample

4. the degree of crowding of a population

One of the major contributors to our understanding of vaccination was Edward Jenner. What is Jenner's contribution to the development of vaccinations? Choose the statement that best describes the work of Edward Jenner.

You breed a plant that has purple flowers with a plant that has orange flowers and the resulting offspring has purple and orange stripe flowers. What type of heredity does flower color exhibit in these plants?

Ciprofloxacin (cipro) is an antibiotic that inhibits bacterial dna replication. it enters cells by diffusion. many cells resist the action of cipro by expressing a membrane protein that pumps the antibiotic out the cell.

While hiking in the forest Karl walked past a y'all tree with cones hanging from branches it is the tallest tree in the forest to which phylum does this plant belong

Why is it surprising that we know more about the moon or Mars then we do about the deep sea floor and marine habit as a whole?

A scientific name has to refer to what

The changes in the surrounding environment can have an effect on plants too for a few weeks on the autumn season normally green leaves of deciduous plants acquire a red to yellow color how and why does this change in color happen?

Many of the biochemical reactions that occur within cells are catalyzed by enzymes. Which of the following statements is true about most enzyme-assisted reactions?

A cheeseburger from a fast food restaurant contains 19 g of fat, 20 g of carbohydrate, and 28 g of protein. How many kcal of energy does the cheeseburger contain

How do enzymes catalyze chemical reactions (don't just say "they lower the activation energy", give me specific mechanisms) ?