Flu vaccine

Design ways to explore the question "Is the flu vaccine effective?"

Are Dietary Supplements Safe and Effective?

"Are Dietary Supplement Safe and Effective?" comment on the question.

Evaluate a Scientific Claim

Choose an article from a newspaper, magazine, or the Internet- on a topic related to human biology (I chose Too Young for This: Facing Cancer Under 40, from nytimes.com in Health Section) and do the following: ***State the articles primary claim. ***List the "evidence" provided to support the claim. ***Examine each piece of evidence to see if it meets a basic standard of scientific accepptability.

Cells, cell biology & microscopes

1. In an inherited condition called glycogen cardiomyopthy teenagers develop muscle weakness which affects heart as well as other muscles. Samples of the affected muscle cells contain huge lysosomes, swollen with the carbohydrate glycogen. How might this condition arise? 2. Why does a muscle cell conatin many mitochondrion while a white blood cell contain many lysosomes? 3. Exposure to tobacco smoke immobilizes cilia and they eventually disappear. How might this effect explain why smokers have an increased incidence of coughing and respiratory infections? 4. What is the cellular difference between a prokaryote and eukaryote? 5. Why are cells small? 6. What are the advantage... click for more

AUDITORY SYSTEM

Figure 1 shows several audiograms (otherwise known as auditory threshold curves). This is a method of describing the sensitivity of the ear to different sounds. The pitch or frequency of sound is measured in units called Hertz (Hz). A pure tone of any given pitch can be generated at different levels of loudness. Loudness describes our perception of the sound, but the sound has a physical property of pressure that can be measured in units of decibels (dB SPL, where SPL stands for sound pressure level). To construct the audiogram, a sound of a particular frequency is created and its loudness is increased until the listener can just detect it. This is the threshold value. If you look at the aud... click for more