Stem cells are _____
a. unspecialized
b. specialized
c. unable to divide
d. always pluripotent
e. only found in embryos
a
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A positive effect associated with pesticide usage is
1.killing disease-causing insects. 2.killing some pathogens. 3.increasing food supplies. 4.increasing profits for farmers. 5.all of the choices
Life depends on photosynthesis Which organism's life depends on photosynthesis?
a) corals b) oak trees c) humans d) sea slug Elysia chlorotica e) All answers are correct.
If a mutation occurred in a human such that the pharyngeal slits never formed, what do you predict would be the consequence?
A. The opening to the voice box would not form. B. A cleft palate would form. C. The eustachian tubes would not form. D. The thyroid gland would not form. E. The glottis would not form.
Double covalent bonds are both shorter and stronger than single covalent bonds, but they also limit the geometry of the molecule because they ____________________
(a) create a new arrangement of electron shells. (b) change the reactivity of the bonded atoms. (c) limit the rotation of the bonded atoms. (d) prevent additional bonds from being formed with the bonded atoms.