Answer the following statements true (T) or false (F)
1.Cells that produce fine fibers of collagen in cartilage are osteocytes.
2.Damage to the myelin sheath of a neuron may slow or even stop nerve impulse transmission.
3.Cancer is a disease that affects the cell cycle.
4.Homeostasis is the state of internal constancy maintained by living organisms.
5.Positive feedback is the most common way that living organisms maintain homeostasis.
1.FALSE
2.TRUE
3.TRUE
4.TRUE
5.FALSE
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What technique can be used to determine DNA-protein interactions?
A. Western blotting B. PCR C. DNAse I foot printing D. restriction enzyme analysis
A eukaryote cell has all these features except
a. membrane-bound organelles. b. it lacks a nucleus. c. cytosol. d. it is often associated with other cells to form a multi-cellular organism. e. numerous chromosomes.
The transfer of polypeptides into the ER is called
A) transit sequence import. B) post-translational import. C) cotranslational import. D) endoplasmic import. E) ribosomal import.
The enzyme carbonic anhydrase catalyzes the formation of carbonic acid from carbon dioxide and water. Imagine that you have two sealed tubes with carbon dioxide gas above a buffer containing water and carbon dioxide
One tube has carbonic anhydrase and the other does not. After 24 hours, both tubes are at equilibrium. Which statement below accurately describes the conditions in the tubes? A) The tube with carbonic anhydrase will have a lower concentration of carbon dioxide and a higher concentration of carbonic acid than the tube with any enzyme. B) The tube with carbonic anhydrase will have a higher concentration of carbon dioxide and a lower concentration of carbonic acid than the tube with any enzyme. C) The tubes will have equal concentrations of carbon dioxide and carbonic acid. D) The tube with carbonic anhydrase will have a higher concentration of carbonic acid than the tube with any enzyme, but the concentration of carbon dioxide will be the same in both tubes. E) It is not possible to determine the relative concentrations of the products and reactants without more information about carbonic anhydrase, such as the Km. What will be an ideal response?