Exam 3 for practice with key-1

Exam 3 for practice with key-1 - Name_ MULTIPLE CHOICE....

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Name______________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1)The process of transduction usually begins A) after the target cell divides. B) when the chemical signal is released from the alpha cell. C) when the signal molecule changes the receptor protein in some way. D) after the third stage of cell signaling is completed. E) when the hormone is released from the gland into the blood. 2)A small molecule that specifically binds to another molecule, usually a larger A) seldom is involved in hormonal signaling. B) is called a polymer. C) is called a ligand. D) is called a signal transducer. E) usually terminates a signal reception. 3)What would be true for the signaling system in an animal cell that lacks the ability to produce GTP? A)It could activate only the epinephrine system. B) It would not be able to activate and inactivate the G protein on the cytoplasmic side of the plasma membrane. C) It would be able to carry out reception and transduction, but would not be able to respond to a signal. D)Only A and C are true. E)A, B, and C are true. 4)Membrane receptors that attach phosphates to specific animo acids in proteins are A)not found in humans. B)a class of GTP G-protein signal receptors. C). associated with several bacterial diseases in humans. D)important in yeast mating factors that contain amino acids. E) called receptor tyrosine-kinases
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
5)Which of the following are chemical messengers that pass through the plasma membrane of cells and have receptor molecules in the cytoplasm? A) epinephrine B) cAMP C) testosterone D) insulin 6) One of the major categories of receptors in the plasma membrane reacts by forming dimmers, adding phosphate groups, then activating relay proteins. Which type does this? A) receptor tyrosine kinases B) G protein-linked receptor C)ligand-gated ion channels D) steroid receptors 7) In general, a signal transmitted via phosphorylation of a series of proteins A)allows target cells to change their shape and therefore their activity. B)requires binding of a hormone to a cytosol receptor.
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 03/07/2011 for the course BIO 181 taught by Professor Jorstad during the Spring '07 term at University of Arizona- Tucson.

Page1 / 9

Exam 3 for practice with key-1 - Name_ MULTIPLE CHOICE....

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online