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Mastering Biology Chapter 6 Homework Questions and Answers
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Mastering Biology Chapter 6 Homework
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Mastering Biology Chapter 6 HomeworkWhich of the following choices correctly matches a tool and its proper application? -
answer cell fractionation to study the function of specific organelles
The various parts of the endomembrane system serve different functions in the cell. In
this activity, you will identify the roles of each part of the endomembrane system. -
answer smooth ER- lipid synthesis, calcium ion storage, poison detoxification
rough ER- protein synthesis
Golgi appartus- protein modification and sorting, cisternal maturation
lysosomes- macromolecule digestion, autophagy
All proteins are synthesized by ribosomes in the cell. Some ribosomes float freely in the
cytosol, while others are bound to the surface of the endoplasmic reticulum. Most
proteins made by free ribosomes function in the cytosol. Proteins made by bound
ribosomes either function within the endomembrane system or pass through it and are
secreted from the cell.
Which of the following proteins are synthesized by bound ribosomes? - answerER
protein, insulin, lysosomal enzyme
Proteins that are secreted from a eukaryotic cell must first travel through the
endomembrane system. - answerA. endoplasmic reticulum
B. cis Golgi cisternae
C. medial Golgi cisternae
D. trans Golgi cisternae
E. plasma membrane
Scientists can track the movement of proteins through the endomembrane system using
an approach known as a pulse-chase experiment. This experiment involves:
the "pulse" phase: Cells are exposed to a high concentration of a radioactively labeled
amino acid for a short period to tag proteins that are being synthesized.
the "chase" phase: Any unincorporated radioactively labeled amino acids are washed
away and large amounts of the same, but unlabeled, amino acid are added.
Only those proteins synthesized during the brief pulse phase are radioactively tagged.
These tagged proteins can be tracked through the chase period to determine their
location in the cell.
, The data below were obtained from a pulse-chase experiment in which cells were
examined at different times during the chase period. The numbers represent the
radioactivity (measured in counts per minute) recorded at each of the indicated sites.
The higher the n - answerphagocytosis
Which of the following are common traits of chloroplasts and mitochondria? -
answerBoth have their own DNA.
Plant cells and animal cells share many of the same structures, but each type of cell
also has unique structures. In this activity, you will indicate which cell structures are
found only in plant cells, only in animal cells, or in both plant and animal cells. -
answerPlant cell only- cellulose cell wall, central vacuole, chloroplast
Animal cell only- centriole
Both- mitochondrion. nucleus, Golgi apparatus, endoplasmic reticulum, plasma
membrane, cytoskeleton
Part B- plant organelle functions - answerplant cell wall- strong protective stucture made
from cellulose fibrils
central vacuole- regulates cytoplasm composition, creates internal pressure, and stores
cell compounds
chloroplast- makes sugar by converting light energy into chemical energy
mitochondrion- produces chemical energy (ATP) that can power the cell
Golgi apparatus- modifies and packages proteins
The structure of a chloroplast is closely tied to its function as the site of photosynthesis.
Some of the following statements are true for chloroplasts; others are true for
mitochondria.
Which statements are true for chloroplasts? Select the three that apply. - answerThey
are the sites of reactions that convert solar energy into chemical energy.
They contain the green pigment chlorophyll.
They have membranous sacs called thylakoids that are surrounded by a fluid called
stroma.
To understand how cells function as the fundamental unit of life, you must first become
familiar with the individual roles of the cellular structures and organelles. - answerA.
synthesizes lipids
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