Which of the following is true of allosteric enzymes?
A) Their activity can be increased by competitive inhibitors.
B) Their activity can be reduced when the product binds the enzyme.
C) Their coenzyme is removed when the product binds the enzyme.
D) Their activity can be reduced when the substrate binds the enzyme.
Answer: B
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Most microorganisms maintain their internal pH
A. near neutral (pH 7). B. slightly alkaline (pH 8-10). C. near their optimum growth pH. D. slightly acidic (pH 4-6).
Because most natural populations are actually metapopulations, we can only understand their dynamics if, in addition to the births and deaths of individuals, we also understand:
A. the extinction of local populations. B. the colonization of local populations. C. r and K selection. D. the extinction and colonization of local populations. E. the extinction and colonization of local populations as well as r and K selection.
The adaptive immune system is complex, but it can be summarized in four consecutive stages: i) lymphocyte encounter with an immunogen, ii) development of lymphocyte specificity against that immunogen, iii) 2nd encounter with the immunogen, and iv) development of memory cells.
Answer the following statement true (T) or false (F)
Which is an incorrect match of taxonomic category and common name?
A. Actinopterygii/ray-finned fish B. Squamata/lizards and snakes C. theropods/crocodiles D. Dipnoi/lungfish E. Apoda/caecilians