Substances that cause euphoria and relieve pain are
a. depressants.
b. stimulants.
c. analgesics.
d. hallucinogens.
e. antipsychotics.
Answer: c
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How is the energy stored in a molecule of ATP used by the sodium-potassium pump protein?
A. It is used to transport potassium ions out of the cell. B. It is used to transport sodium ions into the cell. C. It is used to alter the conformation of the pump protein. D. All of the answer options are correct.
Protein coding genes are transcribed into
1.tRNAs. 2.rRNAs. 3.mRNAs. 4.DNA. 5.polypeptides.
Darwin used the phrase struggle for existence to describe the competition among organisms for the resources needed to survive. What condition would increase the struggle for existence experienced by members of a population?
a) All of the other answer choices b) an increase in the population's food supply c) an increase in the size of the population's environment d) an increase in birth rate among members of the population
Which of the following statements is NOT correct about the arrangement of tissues in the eudicot root?
A. The star-shaped phloem is located in the center of the vascular cylinder, with xylem arranged between the arms of phloem. B. The pericycle is the outer layer of cells in the vascular cylinder, with the ability to form secondary or branch roots. C. The epidermis of the root has no cuticle on its outer surface, unlike other epidermal tissues. D. The Casparian strip is a waxy lining on four sides of the cells of the endodermis, which forces water into the endodermal cells. E. The specialized root tissues are seen at the zone of maturation.