Lysosomal enzymes function best at a pH of about ____
a. 7
b. 6.5
c. 3
d. 5
e. 8.5
ANSWER: d
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Why would bacteria evolve so that the presence of tryptophan inhibits its own production?
A. Producing the enzymes that synthesize tryptophan is metabolically expensive, so it is wasteful to make them when tryptophan levels are high and its synthesis is not necessary. B. Producing high levels of tryptophan inhibits the production of other amino acids, so inhibiting its production allows all amino acids to be synthesized at equal concentrations. C. High levels of tryptophan causes cells to become unresponsive to external stimuli, so its production must be regulated. D. High levels of tryptophan inhibit cellular respiration and the synthesis of ATP, so its production must be regulated. E. All of these choices are TRUE
In the late 1920s, a mutation occurred in many silver
fox farms around the world. The fox farms that sold expensive furs were proud of the quality of their furs, and each advertised that it had the best, purest breed of all the fox farms. The new mutations produced a “platinum” coat pattern that was commercially desirable, so the farms crossed them to get more. The results of their breeding experiments were as follows: (1) silver x silver >>> all silver offspring; (2) silver x platinum >>> equal numbers of silver and platinum; (3) platinum x platinum >>> two platinum for each silver offspring. Explain. What will be an ideal response?
Gradients in Microbial Mats
What will be an ideal response?
Which Ecdysozoan phylum contains members that have a segmented body encased in a rigid exoskeleton made of chitin plus other materials?
a. Annelida b. Nemertea c. Nematoda d. Arthropoda