Microbes can be challenging to study because they often grow in complex communities and it may be difficult to separate the various species from one another to study individually. Which of the following laboratory "tools" or techniques may be of the the most help with separating out different species from complex mixtures?
A) Use of enriched agar for culture
B) Use of light microscopy
C) Use of transmission electron microscopy
D) Use of selective agars for culture
D) Use of selective agars for culture
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The main cause of emphysema is
a. a genetic predisposition. b. exposure to chemicals in the workplace. c. recurring respiratory infections. d. long-term smoking. e. poor diet.
What causes the rhythmic change in cyclin concentration in the cell cycle?
A) The cascade of increased production once the protein is phosphorylated by Cdk B) An increase in production of a Cdk once the restriction point is passed C) Its destruction by an enzyme phosphorylated by the cyclin-Cdk complex D) The binding of PDGF to receptors on the cell surface E) The changing ratio of cytoplasm to genome
You are a part of the first scientific team to land on Mars. What steps would you take to determine whether there is any life there? If you found something, how would you know whether it is a living thing?
What will be an ideal response?
The most common first-position amino acid in bacterial proteins is
a. isoleucine. b. leucine. c. methionine. d. N-formylmethionine.