Most hormones are distributed throughout the body by the
a. exocrine system.
b. lymphatic system.
c. nervous system.
d. blood system.
e. integumentary system.
D
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In mitosis, chromatids separate and move to the center of the cell during ____________________
Fill in the blank(s) with correct word
The veins of leaves are used for
a. support. b. identification. c. transport of water and nutrients. d. detachment in the autumn. e. regeneration.
When two eggs are fertilized by two different sperm, what type of twins is formed?
a. identical twins b. fraternal twins c. always same sex twins d. conjoined twins e. monozygotic
What is the relationship between proto-oncogenes and oncogenes?
A) Oncogenes may develop into cancer-causing proto-oncogenes as a result of synergism. B) Oncogenes prevent proto-oncogenes from encoding proteins for cell division. C) Proto-oncogenes may develop into cancer-causing oncogenes as a result of mutations. D) Proto-oncogenes allow oncogenes to encode proteins that prevent cell division.