Choose the key characteristic that allowed amphibians to successfully invade land.
A. partially divided heart
B. legs
C. cutaneous respiration
D. All of these are correct.
Answer: D
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Cells replicate DNA
A) during the M phase of the cell cycle. B) all the time. C) during the S phase of the cell cycle. D) only when a person is stressed.
The phospholipids of plasma membranes contain _____
a. a hydrophobic head and a hydrophilic tail b. two hydrophobic heads and a hydrophilic tail c. a hydrophobic head and two hydrophobic tails d. a hydrophilic head and two hydrophobic tails e. a hydrophilic head and two hydrophilic tails
The phenotypic sex of a child depends on
A. gene action. B. interactions with other embryos in the uterus. C. interactions within the embryo. D. interactions within the maternal environment. E. all of these causes.
Which statement concerning the root epidermis is true?
a. It does not secrete a waxy cuticle over the root hairs. b. It consists of protective tissue several layers thick. c. There are large intercellular spaces among the cells. d. It comprises the bulk of the eudicot root. e. It is the site of storage of surplus sugars produced in the leaves.