Testosterone is an example of a chemical signal that affects the very cells that synthesize it, the neighboring cells in the testis, along with distant cells outside the gonads. Thus, testosterone is an example of ________.

 I) an autocrine signal

 II) a paracrine signal

 III) an endocrine signal

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#Question id: 5617

#Unit 5. Developmental Biology

In sea urchins and mammals, the rise in Ca2+ concentration responsible for the cortical granule reaction is due to

TLS Online TPP Program

#Question id: 5618

#Unit 5. Developmental Biology

Mouse cumulus cells also secrete a substance that attracts sperm and hyperactivates them through calcium ion channels. The substance is

TLS Online TPP Program

#Question id: 5619

#Unit 5. Developmental Biology

Acrosome intact- sperm and acrosome reacted- sperm bind to which of the zona protein respectively?

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#Question id: 5620

#Unit 5. Developmental Biology

Izumo binds to an oocyte protein called Juno. If eggs deficient in Juno

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#Question id: 5621

#Unit 5. Developmental Biology

In sea urchin, the bindin receptor activates________ which activates PLC-

TLS Online TPP Program

#Question id: 5622

#Unit 5. Developmental Biology

The major motor portion of the flagellum is the axoneme, a structure formed by microtubules emanating from the centriole at the base of the sperm nucleus. These microtubules are made exclusively of the dimeric protein-