26.With regard to cell signalling, which of the following do not represent exogenous signals? A. NeurotransmittersB. Invading microorganismsC. LightD. OdoursE. All of the above statements are correct27.Which of the following statements correctly describe distinct aspects of microtubule dynamic instability? A. αβ-tubulin dimers must contain GTP bound to both subunits to be added to a microtubuleB. Terminal β-subunits have essentially negligible rates of GTP hydrolysisC. The addition of a new αβ-tubulin dimer to a growing microtubule results in GTP hydrolysis within the formerly terminal β-tubulin subunitD. The end of each microtubule has a cap of GTP-bound β-subunits, with the central region of the microtubule primarily consisting of GDP-bound β-subunitsE. All of the above statements are true28.All of the following statements regarding myosin are true, with the exception of: A. Myosin is a multimeric protein made up of heavy and light chainsB. Myosin is not a microfilamentC. The myosin head region has an ADP/ATP binding site, an actin binding site, and is an ATPaseD. ADP/ATP bound myosin is tightly bound to F-actinE. All of the above statements are correct29.With regard to cell signalling receptors, which of the following statements are true? A. Receptors do not exhibit selectivity for particular signalsB. Receptors allow for graded signalling responsesC. Receptors ensure that the same response to a single signal is achieved in different cellsD. Receptors respond to signals directly and do not mediate signal amplificationE. All of the above statements are true30.Which of the following statements regarding endocrine signalling is correct? A. Hormones mediate endocrine signallingB. Endocrine signalling molecules are released into the bloodstreamC. Endocrine signalling molecules access distant target cellsD. Insulin and epinephrine are examples of endocrine signalling moleculesE. All of the above statements are correct.

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Answered: 26.With regard to cell signalling,…

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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26.With regard to cell signalling, which of the following do not represent exogenous signals?

A. Neurotransmitters
B. Invading microorganisms
C. Light
D. Odours
E. All of the above statements are correct

27.Which of the following statements correctly describe distinct aspects of microtubule dynamic instability?

A. αβ-tubulin dimers must contain GTP bound to both subunits to be added to a microtubule
B. Terminal β-subunits have essentially negligible rates of GTP hydrolysis
C. The addition of a new αβ-tubulin dimer to a growing microtubule results in GTP hydrolysis within the formerly terminal β-tubulin subunit
D. The end of each microtubule has a cap of GTP-bound β-subunits, with the central region of the microtubule primarily consisting of GDP-bound β-subunits
E. All of the above statements are true

28.All of the following statements regarding myosin are true, with the exception of:

A. Myosin is a multimeric protein made up of heavy and light chains
B. Myosin is not a microfilament
C. The myosin head region has an ADP/ATP binding site, an actin binding site, and is an ATPase
D. ADP/ATP bound myosin is tightly bound to F-actin
E. All of the above statements are correct

29.With regard to cell signalling receptors, which of the following statements are true?

A. Receptors do not exhibit selectivity for particular signals
B. Receptors allow for graded signalling responses
C. Receptors ensure that the same response to a single signal is achieved in different cells
D. Receptors respond to signals directly and do not mediate signal amplification
E. All of the above statements are true

30.Which of the following statements regarding endocrine signalling is correct?

A. Hormones mediate endocrine signalling
B. Endocrine signalling molecules are released into the bloodstream
C. Endocrine signalling molecules access distant target cells
D. Insulin and epinephrine are examples of endocrine signalling molecules
E. All of the above statements are correct.

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