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Cell Biology
Which phrase best describes chromatin
the region that joins chromatids together
single stranded DNA that cannot undergo replication
a fiber composed of DNA and protein molecules
DNA in its duplicated, tightly condensed form
the region that joins chromatids together
single stranded DNA that cannot undergo replication
a fiber composed of DNA and protein molecules
DNA in its duplicated, tightly condensed form
Cell Biology
Select the phrases that describe the plasma membrane
regulates transport of molecules into and out of the cell
provides a rigid structure that allows the cell to hold it shape
separates the nucleus and the cytosol
creates a barrier between the inside and outside of the cell
regulates transport of molecules into and out of the cell
provides a rigid structure that allows the cell to hold it shape
separates the nucleus and the cytosol
creates a barrier between the inside and outside of the cell
Cell Biology
which is the correct answer for the question below?
The B cell receptor
i)is expressed by B cells and plasma cells
ii) recognises processed antigen
iii)binds to complement component C3
iv) all of the above
v) has the same antigenic specificity as the soluble antibody
The B cell receptor
i)is expressed by B cells and plasma cells
ii) recognises processed antigen
iii)binds to complement component C3
iv) all of the above
v) has the same antigenic specificity as the soluble antibody
Cell Biology
mitochondria, cytochrome b begins to absorb light, but a an c do not. Finally, purified cytochrome c, even in the presence of oxygen, continues to absorb light. Use these observation to decide the order in which the cytochromes occur in the mitochondrial electron transport system. Explain your reasoning for your determined order. Why is it important that the cytochrome c be purified in the last observation
While cytochromes are real moieties and you will find an abundance of information about them in your text and via the web, it is critical that you realize that the data for solving this assignment is imbedded in the question. This question contains the data you need to answer the question. If you read the book or look at online resources and rely on the order provided there you could be mistaken. The data is in the question, you need to interpret the data, and make inferences based upon that data.
While cytochromes are real moieties and you will find an abundance of information about them in your text and via the web, it is critical that you realize that the data for solving this assignment is imbedded in the question. This question contains the data you need to answer the question. If you read the book or look at online resources and rely on the order provided there you could be mistaken. The data is in the question, you need to interpret the data, and make inferences based upon that data.
Cell Biology
Which of the following events can result in protein misfolding.
a protein adapts a stable but non functional, tertiary structure
contact with a misfolded protein with the same amino acid sequence
a mutation in a gene that inserts an amino acid in a protein
interaction of a partially folded protein with molecular chaperones
the binding of a coenzyme to a protein after normal protein folding
a protein adapts a stable but non functional, tertiary structure
contact with a misfolded protein with the same amino acid sequence
a mutation in a gene that inserts an amino acid in a protein
interaction of a partially folded protein with molecular chaperones
the binding of a coenzyme to a protein after normal protein folding
Cell Biology
which of the following are true of endosymbiotic theory
explains why mitochondria contain their own genetic information
provides insight about why mitochondria can survive outside of a eukaryotic cell
explains the origin of all organelles found within a eukaryotic cell
states that an ancestral eukaryotic cell engulfed a photosynthetic proteobacteria
explains the origin of some eukaryotic organelles such as chloroplasts
explains why mitochondria contain their own genetic information
provides insight about why mitochondria can survive outside of a eukaryotic cell
explains the origin of all organelles found within a eukaryotic cell
states that an ancestral eukaryotic cell engulfed a photosynthetic proteobacteria
explains the origin of some eukaryotic organelles such as chloroplasts
Cell Biology
Under which of the following circumstances, will there be a temporary shift from noncyclic to cyclic e– flow during light reaction of photosynthesis?
(1) Absence of PS II
(2) Rise in level of ATP
(3) Rise in level of NADPH + H+
(4) Chl a < Chl b
(1) Absence of PS II
(2) Rise in level of ATP
(3) Rise in level of NADPH + H+
(4) Chl a < Chl b
Cell Biology
Which of the following statement is false? and how?
(1) In stroma CO2 is fixed
(2) Chloroplast aligned with their flat surfaces parallel to the lateral walls in low light intensity
(3) With in chloroplast there is a membranous system consisting of grana, stroma lamellae and stroma
(4) The membrane system is responsible for trapping the light energy and also for the synthesis of ATP and NADPH
(1) In stroma CO2 is fixed
(2) Chloroplast aligned with their flat surfaces parallel to the lateral walls in low light intensity
(3) With in chloroplast there is a membranous system consisting of grana, stroma lamellae and stroma
(4) The membrane system is responsible for trapping the light energy and also for the synthesis of ATP and NADPH
Cell Biology
A cell 'A' having osmotic potential –15 atm and wall pressure 10 atm, present adjacent of cell 'B' having osmotic potential –20 atm and wall pressure 11 atm, the flow of water would be :-
(1) From A to B
(2) From B to A
(3) Equal flow
(4) No flow
(1) From A to B
(2) From B to A
(3) Equal flow
(4) No flow
Cell Biology
Imagine five cells, each of a different shape and all requiring oxygen. Which of the following would have the most satisfactory oxygen supply? Why?
1.A cube 1mm on a side.
2.A cylinder 1mm long and 0.1 mm in diameter.
3.A cylinder 10 mm long and 0.1 mm in diameter.
4.A flat disk 0.1 mm thick and 1 mm in diameter.
5.A sphere 1 mm in diameter.
but explain why or why not each and every one of the above choices is the best choice or not the best choice
1.A cube 1mm on a side.
2.A cylinder 1mm long and 0.1 mm in diameter.
3.A cylinder 10 mm long and 0.1 mm in diameter.
4.A flat disk 0.1 mm thick and 1 mm in diameter.
5.A sphere 1 mm in diameter.
but explain why or why not each and every one of the above choices is the best choice or not the best choice
