2020 PRACTICE EXAM 1 MCQ - AP BIOLOGY QUESTION AND VERIFY ANSWERS

2020 PRACTICE EXAM 1 MCQ - AP
BIOLOGY QUESTION AND VERIFY
ANSWERS

The high heat of vaporization of water allows the body to remove excess heat through a p
rr rr rr rr rr rr rr rr rr rr rr rr rr rr rr rr


hase change of water from liquid to gas. - ans-
rr rr rr rr rr rr rr rr rr


Humans produce sweat as a cooling mechanism to maintain a stable internal temperatur
rr rr rr rr rr rr rr rr rr rr rr rr


e. Which of the following best explains how the properties of water contribute to this physi
rr rr rr rr rr rr rr rr rr rr rr rr rr rr rr


ological process? rr




Placing salt water in chamber A and distilled water in chamber B - ans-
rr rr rr rr rr rr rr rr rr rr rr rr rr


A student placed a semipermeable membrane inside a U-
rr rr rr rr rr rr rr rr


shaped channel with two chambers. The membrane (which sits at the bottom/
rr rr rr rr rr rr rr rr rr rr rr


in the middle of the U) permits the movement of water but not salt. The student wants to v
rr rr rr rr rr rr rr rr rr rr rr rr rr rr rr rr rr rr


ary the rate of osmosis that occurs across the membrane. Which of the following experim
rr rr rr rr rr rr rr rr rr rr rr rr rr rr


ental designs will result in the fastest net rate of water movement into chamber A?
rr rr rr rr rr rr rr rr rr rr rr rr rr rr




Water molecules donate electrons to the electron transport chain. - ans-
rr rr rr rr rr rr rr rr rr rr


Which of the following best describes the role of water in photosynthesis?
rr rr rr rr rr rr rr rr rr rr rr




Evolution of a nucleus in eukaryotes separates the processes of transcription and translat
rr rr rr rr rr rr rr rr rr rr rr rr


ion and they can be regulated separately. - ans-
rr rr rr rr rr rr rr rr


What evolutionary advantage does compartmentalization of core metabolic processes off
rr rr rr rr rr rr rr rr rr


er eukaryotes?
rr




The mitochondrial matrix - ans-
rr rr rr rr


Pyruvate dehydrogenase is an enzyme that converts pyruvate to acetyl-CoA. Acetyl-
rr rr rr rr rr rr rr rr rr rr


CoA is further metabolized in the Krebs cycle. A researcher measured the accumulation o
rr rr rr rr rr rr rr rr rr rr rr rr rr


f acetyl-
rr


CoA in a reaction containing pyruvate and pyruvate dehydrogenase under several differe
rr rr rr rr rr rr rr rr rr rr rr


nt conditions. Which of the following best describes the cellular location where pyruvate d
rr rr rr rr rr rr rr rr rr rr rr rr rr


ehydrogenase is most likely active? rr rr rr rr




1 micromole/sec - ans-
rr rr rr


Pyruvate dehydrogenase is an enzyme that converts pyruvate to acetyl-CoA. Acetyl-
rr rr rr rr rr rr rr rr rr rr


CoA is further metabolized in the Krebs cycle. A researcher measured the accumulation o
rr rr rr rr rr rr rr rr rr rr rr rr rr


f acetyl-
rr


CoA in a reaction containing pyruvate and pyruvate dehydrogenase under several differe
rr rr rr rr rr rr rr rr rr rr rr


nt conditions. The maximum production rate of acetyl-
rr rr rr rr rr rr rr


CoA under condition 1 is closest to which of the following?
rr rr rr rr rr rr rr rr rr rr

, The rate of the pyruvate dehydrogenase-
rr rr rr rr rr


catalyzed reaction is slower in the presence of a higher concentration of acetyl-CoA. -
rr rr rr rr rr rr rr rr rr rr rr rr rr


ans-Pyruvate dehydrogenase is an enzyme that converts pyruvate to acetyl-CoA. Acetyl-
rr rr rr rr rr rr rr rr rr rr rr


CoA is further metabolized in the Krebs cycle. A researcher measured the accumulation o
rr rr rr rr rr rr rr rr rr rr rr rr rr


f acetyl-
rr


CoA in a reaction containing pyruvate and pyruvate dehydrogenase under several differe
rr rr rr rr rr rr rr rr rr rr rr


nt conditions. Which of the following observations provides the best evidence that acetyl-
rr rr rr rr rr rr rr rr rr rr rr rr


CoA negatively regulates pyruvate dehydrogenase activity?
rr rr rr rr rr




Cells undergo fermentation because pyruvate cannot be metabolized to proceed into the
rr rr rr rr rr rr rr rr rr rr rr rr


Krebs cycle. - ans- rr rr rr


Pyruvate dehydrogenase is an enzyme that converts pyruvate to acetyl-CoA. Acetyl-
rr rr rr rr rr rr rr rr rr rr


CoA is further metabolized in the Krebs cycle. A researcher measured the accumulation o
rr rr rr rr rr rr rr rr rr rr rr rr rr


f acetyl-
rr


CoA in a reaction containing pyruvate and pyruvate dehydrogenase under several differe
rr rr rr rr rr rr rr rr rr rr rr


nt conditions. Pyruvate dehydrogenase deficiency is a genetic disease most commonly li
rr rr rr rr rr rr rr rr rr rr rr


nked to a mutation in the 𝛼- rr rr rr rr rr rr


subunit of the mitochondrial enzyme that causes the enzyme to cease functioning. As a re
rr rr rr rr rr rr rr rr rr rr rr rr rr rr


sult of the mutation, affected individuals build up dangerous amounts of lactic acid. Which
rr rr rr rr rr rr rr rr rr rr rr rr rr r


of the following best explains the buildup of lactic acid in individuals with the mutation?
r rr rr rr rr rr rr rr rr rr rr rr rr rr rr




Water and the xylem are both polar. Water molecules have the ability to form hydrogen bo
rr rr rr rr rr rr rr rr rr rr rr rr rr rr rr


nds with each other and with the walls of the xylem. - ans-
rr rr rr rr rr rr rr rr rr rr rr rr


The diagram shows how water can adhere to the xylem in the stems of plants, which contr
rr rr rr rr rr rr rr rr rr rr rr rr rr rr rr rr


ibutes to water movement in the plant. Which of the following best explains how water is a
rr rr rr rr rr rr rr rr rr rr rr rr rr rr rr rr


ble to move upward from the roots of a plant, through its xylem in the stem, and out to the l
rr rr rr rr rr rr rr rr rr rr rr rr rr rr rr rr rr rr rr rr


eaves?

Protein X is a transcription factor. - ans- rr rr rr rr rr rr rr


Protein X activates gene expression only in cells exposed to a specific signaling molecule
rr rr rr rr rr rr rr rr rr rr rr rr rr


. In a study, researchers determined the intracellular location of Protein X in cultured cells
rr rr rr rr rr rr rr rr rr rr rr rr rr rr rr


both before and after exposing the cells to the signaling molecule. The results of the study
rr rr rr rr rr rr rr rr rr rr rr rr rr rr rr


are shown in the diagram. Based on the results, which of the following best describes wh
rr rr rr rr rr rr rr rr rr rr rr rr rr rr rr rr


at Protein X is?
rr rr rr




Prolactin is a homologous hormone because it has a common origin but different function
rr rr rr rr rr rr rr rr rr rr rr rr rr


s in various species. - ans-
rr rr rr rr rr


The hormone prolactin has varying effects in many different animal species. All vertebrate
rr rr rr rr rr rr rr rr rr rr rr rr


s produce prolactin, which is involved in signal transduction pathways. In mammals, prola
rr rr rr rr rr rr rr rr rr rr rr rr


ctin stimulates the production of milk in mammary glands. In fish, prolactin plays an import
rr rr rr rr rr rr rr rr rr rr rr rr rr rr


ant role in osmoregulation. In birds, prolactin is involved in lipid metabolism. Which of the f
rr rr rr rr rr rr rr rr rr rr rr rr rr rr rr


ollowing best explains the presence of prolactin in various vertebrate species?
rr rr rr rr rr rr rr rr rr rr




A negative feedback mechanism that reverses the environmental change - ans-
rr rr rr rr rr rr rr rr rr rr


Certain reef- rr


building corals contain photosynthetic, symbiotic algae that have the ability to make dimet
rr rr rr rr rr rr rr rr rr rr rr rr