Babies were accidentally switched at the hospital! Mr. and Mrs. Fire both have type O blood. Which of the following four babies of the same age is most likely the Fire child?
A) baby with type A B) baby with type AB C) baby with type B D) baby with type O
Answer: D
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Scientific discoveries have had great impact in human history. The people who make these discoveries and the circumstances that surround these discoveries are very important to our understanding of science. Can you identify the individuals as they might have described themselves?
a. I am a seventeenth century shopkeeper from Holland. My hobby involves hand-polishing glass to make lenses, some of which can magnify almost 300-fold. I was the first to observe living cells and am known as the "Father of Microbiology." b. I was the Curator of Instruments for the Royal Society of London in 1665. I developed a crude microscope that could magnify around 30-fold. I examined plant material and observed many small chambers that I called cellulae. c. At the University of California, Berkeley, I worked with radioisotopes. In the late 1940s and early 1950s, I used carbon-14 to identify the most common pathway for photosynthetic carbon metabolism. d. We worked out the double helix model of DNA structure in 1953. We later received the Nobel Prize for this work. e. I am a nineteenth century German chemist. By synthesizing an organic molecule from inorganic components, I dispelled the idea that biological processes were exempt from the laws of chemistry. f. My colleague and I worked with bacterial viruses. We were able to demonstrate that DNA–not protein–was the genetic material of the cell. g. I am a Swedish scientist. I developed the ultracentrifuge to determine sedimentation rates of proteins. The ultracentrifuge was later used to isolate subcellular fractions.
Which of the following species will not establish a territory during the breeding season?
a. Lions b. Sage grouse c. Elk d. Bison e. Elephant seals
You are called to investigate a lake in your home town, where the residents fear that a broken pipe from the local sewage treatment plant has turned the formerly pristine lake eutrophic
What three things would you measure, or observe, in the lake to determine whether it is eutrophic?
Nondisjunction may cause
a)trisomy 21. b)Turner syndrome. c)Jacobs syndrome. d)All answers are correct. e)Klinefelter syndrome.