Quiz #1 Flashcards
A group of organisms in one specific area that belong to the same species is called a ____________________.
population
The primary source of energy for producers in an ecosystem is
light energy
Why is it important that scientific discoveries and ideas be discussed by people with various points of view, from a variety of sub-disciplines, and with diverse cultural backgrounds?
Robust and critical discussion between diverse groups improves scientific thinking.
The main source of energy for autotrophic organisms in an ecosystem is __________________.
light energy
About 25 of the 92 natural elements are known to be essential to life. Which four of these 25 elements make up approximately 96% of living matter?
carbon, hydrogen, oxygen, nitrogen
The atom Sodium (Na) has a mass number of 23 and an atomic number of 11. How many protons and neutrons does Sodium possess?
11 protons & 12 neutrons
Which of the following solutions would require addition of the greatest amount of base to bring the solution to neutral pH?
gastric juice at pH of 2
The atomic number of nitrogen is 7. Nitrogen-15 is heavier than nitrogen-14 because the atomic nucleus of nitrogen-15 contains how many neutrons?
8
A solution of pH 7 is ________ than a solution of pH 8.
ten times as acidic
A solution contains 0.0000001 (10-7) moles of hydrogen ions [H+] per liter. Which of the following best describes this solution?
acidic H+ donor
