You find what you believe is a new species of animal. Which of the following characteristics would enable you to argue that it is more closely related to a flatworm than it is to a roundworm?
A) It has a cuticle that it sheds to grow.
B) It is a suspension feeder.
C) It has no coelom.
D) It is shaped like a worm.
E) It has a mouth and an anus.
Answer: C
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Chloroplast ATP synthases are powered by the flow of protons from the:
A. thylakoid lumen to the stroma. B. stroma to the intermembrane space. C. intermembrane space to the cytoplasm. D. stroma to the thylakoid lumen. E. thylakoid lumen to the intermembrane space.
You are studying a plant with mutant, nonfunctional PIN proteins. Assuming this plant could otherwise develop normally, predict how you might expect this plant to respond to directional light.
A. The plant will move randomly. B. The plant will not move in response to light. C. The plant will bend away from the light. D. The plant will bend toward the light.
Which of the following is most likely synthesized on free ribosomes?
A. Polypeptide chains that form enzymes which function in glycolysis B. Polypeptide chains that form immunoglobulin molecules C. Lysosomal enzymes D. Electron carriers of the electron transport chain
The trigger region
a. is the point at which an action potential starts. b. is adjacent to the cell body. c. is part of the axon. d. contains gated channels for sodium and potassium. e. has all of these characteristics