What molecular precursor is converted into l-citrulline by ornithine transcarbamylase at the beginning of the urea cycle?
a. l-arginine
b. arginosuccinate
c. carbamoyl phosphate
d. fumarate
c. carbamoyl phosphate
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Type I survivorship curves ____
a. are characteristics of mice and other rodents b. typify a population in which all ages have an equal chance of survival c. indicate a high mortality rate in the very young d. show that very few young are produced, that each is given parental support, and that most individuals live a relatively long life and die of old age e. are typical of annual plants
The study of the causes and ecological consequences of spatial patterns on the landscape is called ________
Fill in the blank(s) with correct word
Which of the following is NOT a reason that an animal's gut is a favorable habitat for mutualistic microorganisms?
a. Constant temperature b. Ready supply of nutrients c. Inhospitable conditions for many micro-competitors d. Easy access to bloodstream
What enables competitive inhibitors to bind to a specific enzyme?
a. Competitive inhibitors have structures that resemble the enzyme's substrate. b. Competitive inhibitors have unique sugars that are attracted to the enzyme. c. Competitive inhibitors cover the entire surface of an enzyme. d. Competitive inhibitors form unique covalent bonds with enzyme structures.