Bone matrix is secreted by

a. osteoblasts.
b. osteocytes.
c. osteolytes.
d. osteoclasts.
e. osteopores.


A

Biology & Microbiology

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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?

Biology & Microbiology

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.

Biology & Microbiology

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

Biology & Microbiology

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?

Biology & Microbiology