The DNA in a human cell weighs approximately 2.0 x 10-12 grams. Calculate how many cells you would need to use to isolate 1 mg (milligram or 1x10-3 grams) of DNA, assuming you can get the entire DNA out of a cell. Show your work.

The roots of a plant grow towards a source of ground water

Which of the following is correctly paired with its function? Sensory somatic nervous system-controls skeletal muscles Autonomic nervous system-creates voluntary response to stimuli Parasympathetic nervous system-controls body response to emergency

What does asexual reproduction and sexual reproduction both have in common

Which is the result of genetic drift? A) increase in the size of the gene pool B) a decrease in genetic diversity C) an increase in total allelic frequency D) decrease in the size of the population

What adaptation keeps hippos from getting sunburned?

How is a door hinge like the joint in your knee

Which biome receives 200 to 400 cm of rain per year? A) deciduous forest B) temperate rain forest C) taiga D) grassland

Which of the following statements violates the cell theory? A) Mitosis produces new cells identical to the parent cell that divided to make them. B) Viruses are not considered to be living organisms, because they are smaller than a cell.

One scientist discovered a new theory on the evolution of the universe. What is the next step for the scientist to take?

Darwin and the theory of evolution a. True b. False worksheet