A genetic counselor might discuss assisted reproductive technologies with a couple who wish to
A) adopt a child.
B) avoid passing on a disease-causing allele to a child.
C) avoid cancer in their children.
D) have a child who will excel at a particular sport or have a particular talent.
B) avoid passing on a disease-causing allele to a child.
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Early vascular plants had true leaves
A. true B. false
Flowering plants that are salt tolerant are called
a. algae. b. conifers. c. halophytes. d. sporophytes. e. haptophytes.
What respiratory adaptation was important for the invasion of land by arthropods?
A. positive pressure breathing to increase gas exchange B. cutaneous respiration in moist habitats C. gas- and water-permeable exoskeletons D. the ability to close spiracles to prevent water loss E. countercurrent exchange surrounding the trachea
Proteins differ from one another because
A) the peptide bonds linking amino acids differ from protein to protein. B) the sequence of amino acids in the polypeptide chain differs from protein to protein. C) each protein contains its own unique sequence of sugar molecules. D) the number of nucleotides found in each protein varies from molecule to molecule.