AP Biology: Unit - 3 - Cell Communication and Cell Cycle ...

1 AP Biology: Unit - 3 - Cell Communication and Cell Cycle Practice TestQuestion 1:Which of the following would be an example of paracrine signaling in animals? factorQuestion 2:A signal molecule that binds to a plasma-membrane protein is proteinQuestion 3:What is a G protein? type of membrane-receptor on the cytoplasmic side of a proteinQuestion 4:What do second messengers do? a signal through the lipid a signal from the outside to the inside of the message from the inside of the mebrane throughout the the messageQuestion 5:Which of the following can activate a protein by transferring a phosphate group to it? phosphataseQuestion 6:Signal amplification is most often achieved enzyme of multiple of adenylyl cyclaseQuestion 7:What does a protein phosphatase do?

2 Phosphates from ATP to an enzyme with a signal of the aboveQuestion 8: What is a phosphorylation cascade? of hormones through the of hormones through the removal of a series of molecules that get phosphorylatedQuestion 9: What determines whether a signal molecule binds on the surface or enters the cell? to cross the of these are correctQuestion 10:Cyclins are small proteins that bind to and activate CDK enzymes during the process 11:Which of the following shows the correct sequence of the cell Cycle ? > G1->S->G2-> >G1-> G2-> mitosis-> >mitosis->G1->S-> >S->G2->mitosis->cytokinesisQuestion 12:According to the feedback loop, what does high blood sugar promote?

3 UptakeQuestion 13:Which of the following phrases best describes cytokinesis? of the of the of of surface areaQuestion 14:When a plant cell goes through cell division, 2 new nuclei are separated by the cell membrane pinching new cells are cell plate forms, dividing the 2 new of the aboveQuestion 15:In which stage of the cell Cycle do the nucleus and its contents divide? 2 Question 16:A student is examining a whitefish blastula cell under a microscope. Based on his observations, the student proposes that the whitefish blastula cell is in of the following pieces of evidence would best support the student s claim? genetic content of the cell exists as dispersed mitotic spindle is fully assembled, with its poles at opposite ends of the chromatids have separated and are moving toward opposite poles of the cleavage furrow has formed on the cell s 17:Adenoviruses are a family of highly contagious viruses that most commonly cause illnesses of the respiratory system, such as bronchitis or pneumonia.

4 In the first phase of an adenovirus infection, the host cell expresses several viral proteins. One of these proteins, E1B-55k, inhibits the activity of the host protein p53, a tumor suppressor that arrests the cell Cycle or induces apoptosis when DNA damage is of the following claims is best supported by the information above? causes infected cells to undergo programmed cell decreases the likelihood of apoptosis in infected causes infected cells to transition out of the cell Cycle and into G0 increases the likelihood of cell Cycle arrest in infected 18:Which of the following correctly describes how positive and negative feedback are different?

5 Feedback requires the detection of stimuli, while positive feedback functions independently of feedback moves a system closer to its set point, while negative feedbackmoves a system further from its set feedback occurs only in response to stimuli, while negative feedback canoccur in the absence of feedback reverses changes in a system, while positive feedback amplifies changes in a 19:The following graph shows how cellular DNA content changes over the course of a typical mitotic cell Cycle in rapidly proliferating human on the graph, which of the following labeled phases corresponds to S phase of the cell Cycle ? A, because it is the longest phase of the cell B, because the amount of cellular DNA is doubled during this C, because it occurs immediately after the amount of cellular DNA is D, because the amount of cellular DNA is halved during this