An individual can be homozygous for a trait, which means ________.
A. their two alleles carry different information
B. they can only express the dominant trait
C. they can only express the recessive trait
D. both of their alleles carry the same information
Answer: D
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What is the main benefit of having hemoglobin in the blood?
A. It increases the amount of oxygen that can be carried in the blood. B. It keeps oxygen separated from carbon dioxide within the blood. C. It increases the solubility of carbon dioxide in the blood plasma. D. It is an important source of iron for body cells. E. All of the answer options are correct.
You are examining a new animal species. You find that you can pass a line through any longitudinal plane and find equal halves. Evaluate the symmetry of this animal.
A. spherical. B. radial. C. bilateral.
Water can mingle with other elements because it is a:
a. heating agent. b. solvent. c. solid. d. vapor. e. nonpolar molecule.
Scientists believe that mitochondria may have evolved from bacteria because ____
a. they both have cristae membranes b. mitochondria have their own DNA c. their shapes and sizes are exactly the same d. both are surrounded by a cell wall e. both can live independently