The principal microtubule-organizing center in animal cells is the ____________
(a) centrosome.
(b) centromere.
(c) kinetochore.
(d) cell cortex.
(a)
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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
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
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
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