In all living cells, DNA controls cellular activities by
a. determining the order of amino acids in protein molecules
b. regulating the concentration of molecules on both sides of the cell membrane.
c. varying the rates of starch synthesis
d. coordinating active and passive transport.
Answer: a. determining the order of amino acids in protein molecules
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Which of the following exert bottom-up control?
A. a parasite that resides in a mammal's gut B. a tertiary predator with fluctuating population size C. levels of calcium and nitrogen in the soil D. a disease-carrying protist
The chemical reactions that cells use to acquire and use energy to live, grow and reproduce are called ____
a. hydrolysis b. condensation c. phosphorylation d. metabolism e. oxidation
Approximately what percentage of the species that have ever existed on Earth are represented by the estimated 10 million species that exist today?
A) 80% B) 10% C) 1% D) 0.0001%
Orgasm is the physiological and psychological climax of sexual stimulation in males and females.
Indicate whether the statement is true or false.