The term “respiration” in animals refers to the ____
a. movement of oxygen into an animal only
b. movement of carbon dioxide out of an animal only
c. movement of oxygen into an animal and the movement of carbon dioxide out of the animal
d. binding of oxygen to hemoglobin molecules in the blood
e. diffusion of oxygen across a cell membrane
ANSWER: c
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True or false: Competition can only occur between members of the same species
A. true B. false
The most common isotope of carbon has an atomic number of 6 and a mass number of 12, while the most common
isotope of oxygen has an atomic number of 8 and a mass number of 16. A molecule of CO2 made up of these common isotopes has a molecular weight of ____.
a. 28 b. 44 c. 56 d. 14 e. 22
Which group of fishes gave rise to the amphibians?
A) Ray-finned fishes B) Lobe-finned fishes C) Cartilaginous fishes D) Jawless fishes
When cells are grown in a laboratory, which of the following is a factor that can stop normal cells from dividing?
A) contact with other cells B) growth factors C) a cut in the skin D) injection of cyclin