Soil water enters the root through the root ________.
A. Xylem
B. Phloem vessels
C. Epidermis
D. Endodermis
E. Cortex
Answer: C. Epidermis
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Which of the following is true of both neurotransmitters and hormones?
A. They are both involved in paracrine signaling. B. They both interact with receptors inside or on the surface of target cells. C. They are both produced in glands. D. They both travel through the bloodstream to target cells. E. They both influence the activity of multiple organs simultaneously.
For most atoms, when does the configuration of electrons make the atom unreactive?
a. when the atom has moved all of its electrons to its outermost shell b. When the atom has as many protons as neutrons c. When the atom achieves a zero net charge d. When the atom as 8 electrons in its outermost shell
The allele at locus B is likely to be lethal when combined with the allele for barred eyes.
a. true b. false
________ increase the surface area of roots
A) Plasmodesmata B) Cell walls C) Casparian strips D) Root hairs