What type of bonds form from the unequal sharing of electrons?
A. hydrogen.
B. ionic.
C. polar covalent.
D. nonpolar covalent.
E. electrostatic.
C. polar covalent.
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Peripheral shadows or flashes of light can be a sign that the retina is peeling away from the layer below. Why is detachment of the retina a medical emergency?
A. It contains the photoreceptor cells that respond to light. B. It is crucial for focusing the image. C. It secretes tears that bathe and protect the eyeball. D. It is a sphincter muscle that controls light transmission. Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about the retina? What other information is related to the question? Choose Answer Given what you now know, what information is most likely to produce the correct answer? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Describe the structure and organization of the rDNA repeat unit in eukaryotes
What will be an ideal response?
What is happening when a neuron is at rest before an action potential?
A) The membrane is depolarized. B) Membrane ion channels are open. C) Potassium is diffusing out of the cell. D) The inside of the neuron is negative relative to just outside the neuron.
Which of the following choices best describes the role of the lysosome?
(a) transport of material to the Golgi (b) clean-up, recycling, and disposal of macromolecules (c) sorting of transport vesicles (d) the storage of excess macromolecules