Biogeochemical cycles describe ____
a. the constant recycling of nutrients between biotic and abiotic components of ecosystems
b. pathways by which energy and nutrients move through biotic components of ecosystems
c. all available nutrients in an ecosystem
d. a series of mathematical equations that define an ecosystem’s most important relationships
e. the input of solar energy into a closed ecosystem
ANSWER: a
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If you skip a meal, ____
a. insulin levels will rise b. glucagon levels will rise c. glucose will be taken up by cells d. both insulin and glucagon levels will rise e. glucose will be converted to glycogen
To determine the probability that two parents who are Bb will a first child that is Bb, use the product
rule. __________________ Indicate whether the statement is true or false.
The purpose of meiosis I is
A. to create 4 haploid cells. B. to separate homologous chromosomes. C. to replicate chromosomes. D. to repair errors in DNA synthesis. E. to separate sister chromatids.
A fossil was found and determined by radiometric dating to be 11,400 years old. What is the ratio of carbon-14 to carbon-12 in this fossil compared to its environment?
A) 12.5% B) 25% C) 37.5% D) 50%