Feeding antibiotics to livestock promotes human health.
Answer the following statement true (T) or false (F)
False
The widespread use of antibiotics in medicine and agriculture may lead to antibiotic resistance in disease-causing bacteria.
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You have been asked to synthesize a new isotope for cadmium. Which part of the original atom would you need to manipulate in order to create an isotope?
A. Neutrons. B. Protons. C. Protons and neutrons. D. Electrons.
What is the main source of increasing greenhouse gases?
a. increased cell respiration b. increased use of fossil fuels c. increased diffusion from the oceans d. increased volcanic activity e. increased animal life on Earth
Radioactive isotopes (radioisotopes) of elements are commonly used in biological experiments as tracers to follow and detect molecules of interest. For example, photosynthetic intermediates produced during carbon dioxide conversion to sugars were detected by exposing algae to carbon dioxide containing a radioactive form of carbon. This radioactive carbon could be rapidly detected in molecules produced by the algae during carbon fixation and sugar production. Why can radioisotopes substitute for non-radioactive isotopes of elements in experiments?
A.) because radioisotopes differ in electron number from non radioactive isotopes,they are more reactive and hence easier to trace B.) because radioisotopes of an element differ only in the number of neutrons, they still behave the same way chemically C.) because compounds containing radioisotopes are not acted upon by enzymes, the radioisotopes will not interfere with normal cellular processes D.) because radioisotopes contain additional protons, they are heavier than non radioactive isotopes of an element and can hence be traced
Molecules that can potentially be converted to intermediates of glycolysis and/or the citric acid cycle include
A) amino acids and proteins. B) glycerol and fatty acids. C) glucose and sucrose. D) starch and glycogen. E) all of the above