Chapter 1.1 Reading

Explain why methicillin resistant Staphlococcus aureus (MRSA) is more prevalent now than it was only 30 years ago

Frequent and inappropriate use of methicillin-type antibiotics has provided selective pressure that has resulted in an increase in the proportion of methicillin-resistant strains of Staphlococcus aureus.

A researcher is designing an experiment to see if a new drug will lower the blood pressure of rats. He uses a double blind design and in addition to giving some of the rats the new drug, some others are given vasopressin, a hormone that is known to lower blood pressure. Why include vasopressin?

It is a positive control

A cardiologist is a physician that treats diseases of the heart and blood vessels that supply the heart with oxygen. What level of biology is cardiology?

Organ System

In all muscle cells, two kinds of protein filaments slide past each other to shorten the muscle cell and generate force. What broad theme of biology does muscle illustrate?

Structure and Function

You see a display for a new diet pill in a grocery store. The display includes a stack of color-printed handouts claiming that the average user of the product loses 5 pounds per week while taking the product. The handout is probably not a reliable source of information about the efficacy of the diet pills?

True

Why are viruses not considered to be living organisms?

Viruses do not have their own cells and they do not reproduce on their own.

How is a community different from an ecosystem?

A community consists of all of the interacting populations in an ecosystem. An ecosystem includes the non-living components that affect life as well as all of the interacting populations in a given area.

A scientist has collected data on the stomach contents of raccoons. He finds that they eat marsh grasses, crayfish, clams, insects, and food items discarded by people. What type of graph would be the best way to show the percentages of each of the components of the raccoons' diet?

Pie Chart