Approximately ____ Y-linked genes have been discovered
a. 10
b. 20
c. 60
d. 80
e. 120
c
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Which of the following includes all of the others?
a. sucrose b. glucose c. cellulose d. glycogen e. carbohydrate
Autosomal aneuploidies arise by:
a. chromosome breakage and rejoining. b. nondisjunction. c. errors in crossing-over. d. mistakes in chromosome replication. e. mutations.
Biochemicals produced in a gland that travel through the blood stream and alter the metabolism of specific target cells are
A. enzymes. B. pheromones. C. neurotransmitters. D. hormones. E. pectines.
The atomic number of an atom is the:
A. number of electrons, plus the number of neutrons, plus the number of protons B. number of protons plus the number of neutrons C. number of protons only D. number of electrons plus the number of protons E. number of neutrons only