PLTW Biomedical Science Unit 3 Exam
Questions and Answers
Allele - Correct Answers -Any of the alternative forms of a gene that may occur at a
given locus.
Autosome - Correct Answers -A chromosome that is not directly involved in determining
sex, as opposed to a sex chromosome
Erythrocytes (Red Blood Cells) - Correct Answers -Any of the hemoglobin-containing
cells that carry oxygen to the tissues and are responsible for the red color of vertebrate
blood
Hematocrit - Correct Answers -The percent of the volume of whole blood that is
composed of red blood cells as determined by separation of red blood cells from the
plasma usually by centrifugation.
Leukocytes (White Blood Cells) - Correct Answers -Any of the blood cells that are
colorless, lack hemoglobin, contain a nucleus, and include the lymphocytes, monocytes,
neutrophils, eosinophils, and basophils.
Sickle Cell Disease - Correct Answers -Individuals who are homozygous for the gene
controlling hemoglobin S. The disease is characterized by the destruction of red blood
cells and by episodic blocking of blood vessels by the adherence of sickle cells to the
vascular endothelium.
Chromosome - Correct Answers -Any of the usually linear bodies in the cell nucleus that
contain the genetic material.
Dominant Trait - Correct Answers -A genetic trait is considered dominant if it is
expressed in a person who has only one copy of the gene associated with the trait.
Gene - Correct Answers -A discrete unit of hereditary information
Genetic Material - Correct Answers -Molecules responsible for heredity and variation of
organisms.
Questions and Answers
Allele - Correct Answers -Any of the alternative forms of a gene that may occur at a
given locus.
Autosome - Correct Answers -A chromosome that is not directly involved in determining
sex, as opposed to a sex chromosome
Erythrocytes (Red Blood Cells) - Correct Answers -Any of the hemoglobin-containing
cells that carry oxygen to the tissues and are responsible for the red color of vertebrate
blood
Hematocrit - Correct Answers -The percent of the volume of whole blood that is
composed of red blood cells as determined by separation of red blood cells from the
plasma usually by centrifugation.
Leukocytes (White Blood Cells) - Correct Answers -Any of the blood cells that are
colorless, lack hemoglobin, contain a nucleus, and include the lymphocytes, monocytes,
neutrophils, eosinophils, and basophils.
Sickle Cell Disease - Correct Answers -Individuals who are homozygous for the gene
controlling hemoglobin S. The disease is characterized by the destruction of red blood
cells and by episodic blocking of blood vessels by the adherence of sickle cells to the
vascular endothelium.
Chromosome - Correct Answers -Any of the usually linear bodies in the cell nucleus that
contain the genetic material.
Dominant Trait - Correct Answers -A genetic trait is considered dominant if it is
expressed in a person who has only one copy of the gene associated with the trait.
Gene - Correct Answers -A discrete unit of hereditary information
Genetic Material - Correct Answers -Molecules responsible for heredity and variation of
organisms.
