BHSC 1200 MIDTERM 1 2025
EXAM
ANSWER ALL QUESTIONS IN THIS SECTION
QUESTION 1
describe the key events that occur during interphase, prophase, metaphase,
anaphase, and telophase - ANSWERS-interphase = period between cell divisions
QUESTION 2
prophase = chromatin fibers condense into paired chromatids; each centrosome
moves to an opposite pole of the cell
QUESTION 3
metaphase = centromeres of the chromatid pairs line up at the metaphase plate
QUESTION 4
anaphase = centromeres split; identica; sets of chromosomes move to opposite
poles of cell
END OF
PAGE 1
, BHSC 1200 MIDTERM 1 2025
EXAM
QUESTION 5
telophase = nuclear envelopes and nucleoli reappear; chromosomes resume
chromatin form; mitotic spindle disappears
QUESTION 6
structure and function of tight junctions - ANSWERS--weblike strands of
transmembrane proteins that fuse together the outer surfaces of adjacent plasma
membranes to seal off passageways between adjacent cells
-inhibit passage of substances between cells and prevent contents of these organs
from leaking into the blood or surrounding tissues
QUESTION 7
structure and function of desmosomes - ANSWERS--contain plaque that attaches
to intermediate filaments and have transmembrane glycoproteins that extend into
the intercellular space between adjacent cell membranes and attach cells to one
another
-contributes to stability of cells and tissue; prevent epidermal cells from separating
under tension and cardiac cells from pulling apart during contraction
END OF
PAGE 2
, BHSC 1200 MIDTERM 1 2025
EXAM
QUESTION 8
structure and function of gap junctions - ANSWERS--connexins (membrane
protein) form tiny fluid-filled tunnels called connexions that connect neighbouring
cells; plasma membranes are separated by a very narrow intercellular gap
-allows ions and small molecules to diffuse from the cytosol of one cell to another
through the connexins; transfer of nutrients and wastes; cell communication,
enable nerve or muscle impulses to spread rapidly among cells
QUESTION 9
examples of tight junctions - ANSWERS--found in epithelial tissue that lines the
stomach, intestines, and urinary bladder
-inhibit passage of substances between cells and prevent the contents of these
organs from leaking into the blood or surrounding tissues
QUESTION 10
examples of desmosomes - ANSWERS--found in epidermis and cardiac muscle
cells
-prevent epidermal cells from separating under tension and prevent cardiac cells
from pulling apart during contraction
END OF
PAGE 3
EXAM
ANSWER ALL QUESTIONS IN THIS SECTION
QUESTION 1
describe the key events that occur during interphase, prophase, metaphase,
anaphase, and telophase - ANSWERS-interphase = period between cell divisions
QUESTION 2
prophase = chromatin fibers condense into paired chromatids; each centrosome
moves to an opposite pole of the cell
QUESTION 3
metaphase = centromeres of the chromatid pairs line up at the metaphase plate
QUESTION 4
anaphase = centromeres split; identica; sets of chromosomes move to opposite
poles of cell
END OF
PAGE 1
, BHSC 1200 MIDTERM 1 2025
EXAM
QUESTION 5
telophase = nuclear envelopes and nucleoli reappear; chromosomes resume
chromatin form; mitotic spindle disappears
QUESTION 6
structure and function of tight junctions - ANSWERS--weblike strands of
transmembrane proteins that fuse together the outer surfaces of adjacent plasma
membranes to seal off passageways between adjacent cells
-inhibit passage of substances between cells and prevent contents of these organs
from leaking into the blood or surrounding tissues
QUESTION 7
structure and function of desmosomes - ANSWERS--contain plaque that attaches
to intermediate filaments and have transmembrane glycoproteins that extend into
the intercellular space between adjacent cell membranes and attach cells to one
another
-contributes to stability of cells and tissue; prevent epidermal cells from separating
under tension and cardiac cells from pulling apart during contraction
END OF
PAGE 2
, BHSC 1200 MIDTERM 1 2025
EXAM
QUESTION 8
structure and function of gap junctions - ANSWERS--connexins (membrane
protein) form tiny fluid-filled tunnels called connexions that connect neighbouring
cells; plasma membranes are separated by a very narrow intercellular gap
-allows ions and small molecules to diffuse from the cytosol of one cell to another
through the connexins; transfer of nutrients and wastes; cell communication,
enable nerve or muscle impulses to spread rapidly among cells
QUESTION 9
examples of tight junctions - ANSWERS--found in epithelial tissue that lines the
stomach, intestines, and urinary bladder
-inhibit passage of substances between cells and prevent the contents of these
organs from leaking into the blood or surrounding tissues
QUESTION 10
examples of desmosomes - ANSWERS--found in epidermis and cardiac muscle
cells
-prevent epidermal cells from separating under tension and prevent cardiac cells
from pulling apart during contraction
END OF
PAGE 3
