Now compare your answer to 4c to your answer to 3c. With the passage of time, have A1 and A2 become more or less genetically distinct?
A. more genetically distinct
B. less genetically distinct
A
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The secretions of endocrine glands ____
a. only affect their own tissue b. provide feedback by paracrine action c. reach their target tissue via the ECF d. reach their target tissues via the circulatory system e. are only active in the nervous system
Sulfa drugs like Bactrim, given for bacterial infections, inhibit bacteria by blocking folic acid synthesis. The precursor molecule of folic acid is para-amino benzoic acid (PABA). Interestingly, PABA has a structure very similar to a sulfa drug. If a sulfa drug is present, the bacterial enzyme will bind the sulfa drug because of structural similarity. This is an example of ________.
A. competitive inhibition B. noncompetitive inhibition C. catabolite repression D. enzyme repression E. enzyme induction
Some of the enzymes stored in peroxisomes are used to break down
A) a cell when it becomes damaged. B) bacteria and viruses. C) faulty proteins produced by the cell. D) the plasma membrane. E) hydrogen peroxide.
Fossils are aged by a process that examines the ________ of known radioactive elements
Fill in the blank(s) with correct word