1. When animals die, the lack of ATP causes muscles to stiffen in rigor mortis b
ID: 266373 • Letter: 1
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1. When animals die, the lack of ATP causes muscles to stiffen in rigor mortis because muscles cannot contract without ATP. actin and myosin cannot bind without ATP. actin and myosin cannot separate without ATP. ATP is required for synthesis of protein filaments. ATP forms cross-bridges between filaments. 2. The hormone cholecystokinin (CCK), released by the _______, stimulates contractions of the _______, ultimately leading to squirts of _______ entering the lumen of the small intestine. stomach; gallbladder; trypsin small intestine; liver; bile small intestine; gallbladder; bile liver; gallbladder; zymogen gallbladder; liver; bile 3. All of the following characterize imprinting except: It involves specific stimuli learned during a critical (or sensitive) period. It occurs during development of parent-offspring recognition. Its effects dissipate rapidly. It requires only brief exposure. Its timing may reflect a brief developmental or hormonal state. 4. The lactose operon is under positive control by the CRP-cAMP complex. In order for the operon to be fully inducible, the CRP-cAMP complex must be: (Select all that apply.) at low concentration. at high concentration. bound to the regulatory region of the operon. absent from the regulatory region of the operon. 5. Which of the following does not characterize the slow block to polyspermy in sea urchins? It makes the vitelline envelope impenetrable to sperm. It involves enzymes from cortical granules dissolving the bonds between the vitelline envelope and plasma membrane. It includes a transient change in membrane potential. It is initiated by the release of calcium ions into the egg's cytoplasm. It involves enzymes from cortical granules degrading sperm-binding molecules on the fertilization envelope. 6. Choose the correct order of events in sea urchin fertilization. Acrosomal reaction; slow block to polyspermy; fast block to polyspermy Formation of the acrosomal process; acrosomal reaction; fast block to polyspermy Acrosomal reaction; formation of the acrosomal process; fusion of egg and sperm plasma membranes; formation of the fertilization cone Acrosomal reaction; sperm organelles enter egg cytoplasm; fusion of egg and sperm plasma membranes; fast block to polyspermy Fast block to polyspermy; acrosomal reaction; slow block to polyspermy 7. In a situation where one relative helps another, the fitness benefit to the recipient of the altruistic act is 10 and the fitness cost to the performer is 2. According to Hamilton's rule, it would be adaptive to help which of the following relatives? (Degree of relatedness is provided after each type of relative.) Full sibling; 0.50 Half sibling; 0.25 First cousin; 0.125 All of the above a and b only 8. Which of the following extraembryonic membranes is incorrectly paired with its function in the developing chick? None of the above; all are correctly paired. Chorion – limits water loss and participates in exchange of respiratory gases Amnion – secretes a protective fluid that surrounds the embryo Allantoic membrane – forms a sac that stores metabolic wastes Yolk sac – encloses yolk, which its cells digest 9. The absolute refractory period of a neuron is the period when the Na+–K+ pump is nonfunctional. results from activation of voltage-gated chloride channels. is when the voltage gated sodium channels are already open or when they are inactivated. occurs when the action potential reaches the synapse. lasts about a minute. 10. Like many hormones, growth hormone (GH) participates in a negative feedback loop that regulates its own secretion. Which of the following processes is most likely part of this negative feedback loop? Growth hormone stimulates release of growth hormone-releasing hormone. Growth hormone stimulates release of growth hormone release-inhibiting hormone. Growth hormone stimulates release of corticotropin-releasing hormone. Growth hormone inhibits release of all tropic hormones. Growth hormone inhibits blood flow through the portal blood vessels. 1. When animals die, the lack of ATP causes muscles to stiffen in rigor mortis because muscles cannot contract without ATP. actin and myosin cannot bind without ATP. actin and myosin cannot separate without ATP. ATP is required for synthesis of protein filaments. ATP forms cross-bridges between filaments.Explanation / Answer
Answer. 1. Rigor mortis occurs because actin and myosin can not separated without ATP.
Answer 2. Chelocystokinin release by the small intestine (duodenum) and stimulates contraction of gall bladder lead to bile secretion into small intestine.
Answer 3. Imprinting does not dissipate rapidly. So this except.
Answer 4. Must be at high concentration and bound to the regulatory region of the operon.
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