What are base pairing rules?

On a laboratory exam, a student is asked to determine if the cells under a microscope are plant cells or animal cells. What might the student look for when making the observation

Which of the following are common in plants but not in animals? a. central vacuoles b. mitochondria c. chloroplasts and central vacuoles d. chloroplasts e. chloroplasts and mitochondria

Why was it initially difficult for researchers to discover the existence of microtubules? a. Microtubules were too small to be seen by electron microscopy. b.

List the five characteristics of the salter-harris types of fractures

In which two layers does the atmosphere's tempature decrease as the altitude increase?

A student uses a balance to determine the mass of a feather. Which is most likely to be correct? A 10grams, B 10meters, C 10liters, D 10milliliters

Why is it that two species cant occupy the same niche for an extended period of time

For each menu item at a fast food restaurant, fat content (in grams) and number of calories were recorded. A scatterplot of these data is given: Reference: Ref 4-3 A plausible value for the correlation between fat content and calories is A. + 0.2. B.

Geologists use radioactive dating for which of the following? (A). Identifying the relative ages of rock layers. (B). Determining the absolute ages of rocks. (C). Telling how radioactive substances is (D). Collecting evidence of fossils.

What basic elements comprise most of the macromolecules?