Term
The series of invaginated membrane sheets in a mitochondrion are called
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| The eight histone core of a nuclesome is compirsed of dimers of? |
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| The tissue of origin of a metastasized tumor cell can be determined based on its |
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Which statement is correct
a) Facultative heterochromatin is never transcribed
b) Constitutive heterochromatin is transcribed mroe often
c)Euchromatin is found in areas with low transcription activity
d) Facultative heterochromatin can be specifically inactivated
e) chromatin is never transcribed |
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Definition
| d) facultative heterochromatin can be specifically inactivated |
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| The spindle assembly checkpoint (SAC) occurs between which meitotic phases? |
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| which drug binds to the plus ends of actin microfilaments, preventing the addition of new G-actin monomers and thereby causing actin microfilament depolymerization? |
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Which of the following statements regardin microtubules is INCORRECT?
a) Growth and shrinkage depends on the rates of tubulin heterodimer addition versus GTP hydrolysis
b) New tubulin heterodimers are added to both the minus and plus ends of the microtuble
c) Microtubule catastrophe occurs when there is a decrease in the concentration of free tubulin heterodimers.
d)GTP hydrolysis is requied for polymerization
e) Simultaneous assembly can occur at one end and dissembly at the other end of a microtubule. |
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Definition
| d) GTP hydrolysis is required for polymerization |
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Term
The following are present in outer membranes of both mitochondria and gram negative bacteria:
a) porins
b)mitopopres
c) bacteriophores
d) nucleoporins
e) chromophores |
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| how does the cell plate develop in a dividing plant cell? |
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| Which molecule is composed of two long polypeptides with several globular domains for binding other molecules? |
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| Which type of proteins are responsible for orgainzing microfilmments into three-dimensional networks in animal cell? |
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| Scurvy is the result of defects in which molecule? |
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Which ofthe following statements regarding the components of the the cytoskelton is incorrect?
a) various motor proteins bind to microtubules or microfilaments
b)the cytoskeleton positions membrane-bound organelles with the cytosol
c) all three cytoskeleton elements are polar
d)all three cytskeleton elements play a role in maintaining cell struture
e) all three cytoskeleton elements are multimeric proteins composed of many repeats of a basic subunit |
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Definition
| c) all three cytoseleton elments are polar |
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| The meshwork of proteins containing phenylaline-glucine (FG) repeat domains is found in: |
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which statement is true?
a) The nucleous is not compartmentizliaed further
b) different chromosomes can have specific locations within a nucleous
c) the nucleous is always round and in the centre of the cell
d) The nucleus always has one nucleous
e) The nuclear envelope remains intact htroughout the cell cycle |
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Definition
| b) different chromosomes can have specific loactions with a nucleus |
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which of the following represents progessivley higher levels of dna packaging?
a)DNA double helix-nucleosome-30nm gibre
b) DNA double helix- 30nm fibre- nucleosome
c) Nucleosome - DNA double helix - 30 nm fibre
d) 30 nm fibre- nucleosome - DNA double helix
e) the order does nto matter |
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Definition
| a) DNA double helix - nucleosome - 30 nm fibre |
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| Which event requires Ran - GTP mediation during nuclear protein import? |
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Definition
| Dissociation of importin-cargo protein complex |
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| In 'search and capture' scenario, microtubules search for what portion on a chromatid? |
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| which activitey is involeved in cyclin-dependt kinase regulation? |
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| The inner-most layer of the nuclear envelope is lined with |
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| which proteins helps form tissues in animals by interacting directyl with various components in the extracellular matrix? |
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| During late anaphase interpolar microtubles exhibit: |
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Which of the following statements regarding gap junctions is correct?
a) Gap junctions are composed primarly of claudins
b) Gap junctions function primarly to allow adjacent cells in a tissue to cooperate metabolically
c) Gap junctinos encricle cells
d) Gap junctions primarly prevent the passage of extracellular materials between adjacent cells
e ) Gap junctions link intermediate filaments to form a continuous cytoskeleton network thoughtout a tissue |
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Definition
| b) gap junctions function primarly to allow adjacent cells in a tissue to cooperate metabolically |
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| which sturucture helps to prevent the movement of integral membrane proteins from the lateral to the apical region of an intestinal epithelial cells? |
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Definition
| an abonormal number of chromosomes |
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| The orientation of what type of plant cell wall molecule is determined by microtubules? |
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| name the integral membrane protein that regulates the functino of a tight junction |
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| Nuclei of a Calico cat coften shows a dark staingin _____ which indicates thta one of the two ________ is in an inactivate state. the calico cat serves as an example of the presence of ___________ as compared to _________, which remains mostly inactived. |
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Definition
| Nuclei of a Calico cat coften shows a dark staingin Barr body which indicates thta one of the two X-chromosomes is in an inactivate state. the calico cat serves as an example of the presence of facultative heterochromatin as compared to constituve heterochromatin which remains mostly inactived. |
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Term
| _____ and ______ in the plant cell wall play a similar role to laminin and fibronectin the the animal cell's extracellular matrix |
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Definition
| Extensins and hemicellulose in the plant cell wall play a similar role to laminin and fibronectin the the animal cell's extracellular matrix |
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| Some proteins can freely diffuse in and out of the nucleos but others require a specific ____________________________ for their _____________________ mediated movemenet into the nucleus. |
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Definition
| Some proteins can freely diffuse in and out of the nucleos but others require a specific nuclear localization signal for their importin mediated movemenet into the nucleus. |
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Term
| _______ is the major protein in hte gap junction |
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Definition
| connexin is the major protein in the gap junction |
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Term
| 2 functions of the basal lamina? |
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Definition
mechaincal support for affected cells
+
Barrier to macromolecular passage |
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| Name the molecular motor protein associated with actin |
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Definition
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| In a mitotic spindle some microtubles known as _________ extend between the centromsoems and the kinetochores while others, known as ______ radiate outward from the centrosome into the space away from the spindle |
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Definition
| In a mitotic spindle some microtubles known as chromosomal microtubules extend between the centromsoems and the kinetochores while others, known as astral micrortubles radiate outward from the centrosome into the space away from the spindle |
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Term
| desribe role of GTPase-activating protein |
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Definition
| hydrolyzes GTP and GDP and thus regulates G-proteins |
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| Describe major role of condensin within the cell |
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Definition
| Binds supercoiled DNA within a chromatid/Compacts chromomes during prophase |
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| Name the microtuble orgainizign center in animal cells |
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| The nucleous uslally contains once or more _________________ along with Gjal bodies, GEMS and dense nuclear ________ |
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Definition
| The nucleous uslally contains once or more nucleolus along with Gjal bodies, GEMS and dense nuclear speckles |
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