Save
Upgrade to remove ads
Busy. Please wait.
Log in with Clever
or
show password
Forgot Password?
Don't have an account?  Sign up 
Sign up using Clever
or
Username is available taken
show password


Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account. Your email address is only used to allow you to reset your password. See our Privacy Policy and Terms of Service.

Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.
focusNode
Didn't know it?
click below
 
Knew it?
click below
Don't Know
Remaining cards (0)
Know
0:00
edit
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how

Bio - ch 11

QuestionAnswer
1) Using the yeast signal transduction pathways, both types of mating cells release the mating factors. These factors bind to specific receptors on the correct cells, which induce changes in the cells that lead to cell fusion.
2) What is most likely to happen to an animal's target cells that lack receptors for local regulators? They might not be able to multiply in response to growth factors from nearby cells.
4) Which of the following is characterized by a cell releasing a signal molecule into the environment, followed by a number of cells in the immediate vicinity responding? paracrine signaling
9) When a neuron responds to a particular neurotransmitter by opening gated ion channels, the neurotransmitter is serving as which part of the signal pathway? signal molecule
11) Which of the following is true for the signaling system in an animal cell that lacks the ability to produce GTP? It would not be able to activate and inactivate the G protein on the cytoplasmic side of the plasma membrane.
12) Testosterone functions inside a cell by binding with a receptor protein that enters the nucleus and activates specific genes.
13) Which of the following is true of transcription factors? They control gene expression.
14) One of the major categories of receptors in the plasma membrane reacts by forming dimers, adding phosphate groups, and then activating relay proteins. Which type does this? receptor tyrosine kinases
15) Because most receptors are membrane proteins, which of the following is usually true? They change their conformation after binding with signal polypeptides.
16) Since steroid receptors are located intracellularly, which of the following is true? The steroid/receptor complex can cross the nuclear membrane.
19) In general, a signal transmitted via phosphorylation of a series of proteins brings a conformational change to each protein.
21) Which of the following is the best explanation for the inability of a specific animal cell to reduce the Ca2+ concentration in its cytosol compared with the extracellular fluid? insufficient ATP levels in the cytoplasm
23) Which of the following would be inhibited by a drug that specifically blocks the addition of phosphate groups to proteins? receptor tyrosine kinase activity
27) Caffeine is an inhibitor of phosphodiesterase. Therefore, the cells of a person who has recently consumed coffee would have increased levels of cAMP.
28) If a pharmaceutical company wished to design a drug to maintain low blood sugar levels, one approach might be to design a compound to block G protein activity in liver cells.
31) Which of the following statements is true of signal molecules? Protein kinase A activation is one possible result of signal molecules binding to G protein-coupled receptors.
34) Which of the following is the best explanation for the fact that most transduction pathways have multiple steps? Multiple steps provide for greater possible amplification of a signal.
36) The function of phosphatases in signal transduction is best described as to inactivate protein kinases and turn off the signal transduction.
37) What explains the increased concentration of Ca++ in the ER? Calcium ions are actively imported from the cytoplasm into the ER.
39) A drug designed to inhibit the response of cells to testosterone would almost certainly result in which of the following? a decrease in transcriptional activity of certain genes
40) At puberty, an adolescent female body changes in both structure and function of several organ systems, primarily under the influence of changing concentrations of estrogens and other steroid hormones. How can one hormone mediate so many effects? Estrogen binds to specific receptors inside many kinds of cells, each of which have different
49) In research on aging (both cellular aging and organismal aging), it has been found that aged cells do not progress through the cell cycle as they had previously. Which of the following would provide evidence that this is related to cell signaling? Growth factor ligands do not bind as efficiently to receptors.
50) Where do apoptotic signals come from? all of the above: the nucleus,the ER, ligand binding, mitochondrial protein leakage
Created by: jonnymac07
 

 



Voices

Use these flashcards to help memorize information. Look at the large card and try to recall what is on the other side. Then click the card to flip it. If you knew the answer, click the green Know box. Otherwise, click the red Don't know box.

When you've placed seven or more cards in the Don't know box, click "retry" to try those cards again.

If you've accidentally put the card in the wrong box, just click on the card to take it out of the box.

You can also use your keyboard to move the cards as follows:

If you are logged in to your account, this website will remember which cards you know and don't know so that they are in the same box the next time you log in.

When you need a break, try one of the other activities listed below the flashcards like Matching, Snowman, or Hungry Bug. Although it may feel like you're playing a game, your brain is still making more connections with the information to help you out.

To see how well you know the information, try the Quiz or Test activity.

Pass complete!
"Know" box contains:
Time elapsed:
Retries:
restart all cards