Your organs are composed of the four tissue types; epithelial, connective, muscle, and nervous tissues. Organs are wondrous things, each one with a different function vital to the homeostasis of your body. While it is easy for us to view a particular organ as a single item, it is in […]

Q1. What unique aptitude do DNA molecules have? Why is this ability so important? What are the similarities and differences in DNA and RNA? What are the respective functions in general and in protein systhesis? What are some things that might damage genes?Q2. As a biologist it is your job […]

In the plant Arabidoposis thaliana, a geneticist is interested in the development of trichomes (small projections) on the leaves. A large screen turns up two mutant plants (A and B) that have no trichomes, and these mutants seem to be potentially useful in studying trichome development. (If they are determined […]

Normal dimensions of the human heart for a live persons can be determined noninvasively using magnetic resonance imaging (MRI) or two dimensional echocardiography (2DE). (S.Kaul, et al., Measurement of normal left heart dimensions using optimally oriented MR images, AM. J. Radiol. 146:75-79, 1986.) During systole the left ventricular cavity has […]