Bone matrix is secreted by
a. osteoblasts.
b. osteocytes.
c. osteolytes.
d. osteoclasts.
e. osteopores.
A
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Ranking questions: Put the steps in the correct order for a birder hearing the call of a whip-poor-will.
__ basilar membrane vibrates in different regions for each note __ action potentials travel down axons that represent different frequencies __ bird sings "whip-poor-will" __ cilia of hair cells bend in different regions for each note __ sound waves travel to the birder's pinna and enter the canal __ pressure waves travel through fluid in the cochlea __ auditory cortex interprets the pattern __ tympanic membrane vibrates __ malleus, incus, and stapes vibrate __ oval window vibrates 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 hearing? 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?
The surfaces of clay particles in soil
a. often bear positively charged ions. b. release water to plants easily. c. often bear negatively charged ions. d. are generally hydrophobic. e. acidify the soil.
Bacteria are grown in 15N (heavy) medium and then transferred to 14N (light) medium and are allowed to replicate for two generations. The DNA is subsequently isolated and centrifuged in a CsCl2 gradient to yield what type of gradient band(s)?
A. one light and one half-heavy band B. one half-heavy (intermediate to heavy and light) band C. one heavy band D. one heavy and one half-heavy band E. one light band
Which of the following are mechanisms to prevent polyspermy? (Check all that apply.)A) Altering the composition of the exterior egg coatB) Change in the membrane potential of the eggC) Cortical granule enzymes remove sperm receptors from egg.D) Special proteins inside the egg compare the DNA of different sperm, choosing the most adapted one.E) Toxic molecules exit the egg to attack the extra sperm.F) Vitelline envelopes lift off the surface of egg.
What will be an ideal response?