The greatest concentration of nitrogen on the planet Earth is found in:

a. living organisms, including bacteria
b. the atmosphere
c. soil minerals
d. fossil fuels
e. oceans


b

Biology & Microbiology

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_____ refers to a system in which individuals select their mates according to phenotype

A. Assortative mating B. Random mating C. Differential mating D. Sexual selection E. All of these

Biology & Microbiology

Adhering and tight junctions are found at the:

a. endoplasmic reticulum b. nuclear membrane c. plasma membrane d. Golgi apparatus e. ribosomes

Biology & Microbiology

In a resting person every minute, 20% of the blood enters the ____

a. lungs b. liver c. brain d. kidney e. skeletal muscle

Biology & Microbiology

Biological systems use free energy based on empirical data that all organisms require a constant energy input. The first law of thermodynamics states that energy can be neither created nor destroyed

For living organisms, which of the following statements is an important consequence of this first law? A) The energy content of an organism is constant except for when its cells are dividing. B) The organism must ultimately obtain all the necessary energy for life from its environment. C) The entropy of an organism decreases with time as the organism grows in complexity. D) Organisms are unable to transform energy from the different states in which it can exist.

Biology & Microbiology