The principal microtubule-organizing center in animal cells is the ____________

(a) centrosome.
(b) centromere.
(c) kinetochore.
(d) cell cortex.


(a)

Biology & Microbiology

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True or false: Kidneys are well adapted for osmoregulation because they receive a large fraction of the blood leaving the heart at each heartbeat

A. true B. false

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Which of the following regions produces hormones that are secreted by the pituitary gland?

A. cerebrum B. cerebellum C. thalamus D. hypothalamus E. medulla oblongata

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Periodical cicadas may be able to interbreed but never do because they emerge to breed at different times. This is an example of a ________ isolating mechanism categorized as ________ isolation

a. prezygotic / behavioral b. prezygotic / temporal c. postzygotic / mechanical d. postzygotic / hybrid inviability

Biology & Microbiology

Organic molecules _______.

a) always contain carbon and hydrogen b) always contain hydrogen c) always contain carbon d) are always food molecules e) are found only in organisms, hence their name

Biology & Microbiology