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WorksheetsBIOSCORE W13 CHAPTER 7 GASEOUS EXCHANGE
Total questions: 26
Worksheet time: 1hrs 5mins
PRACTICUM (USE THE FOLLOWING FORMAT; DH4)
(a)
Which of the following correctly explains why CO2 are mainly transported in the form of bicarbonate / hydrogen carbonate ion (HCO3-)?
A. CO2 easily dissolve into plasma and combines with water
B. CO2 are unable to combines with hemoglobin to form carbaminohemoglobin
C. CO2 easily dissociate into HCO3- and H+ in the red blood cell due to the presence of carbonic anhydrase
D. Red Blood cell is permeable to ions such as HCO3 -and H+
The following reaction occurs in the red blood cell during CO2 transport, EXCEPT..
carbonic acid dissociate into bicarbonate and hydrogen ion
chloride ion diffuse out of the red blood cell to balance the electrochemical neutrality
Hydrogen ions combines with Hb which dissociated from O2 due to the lowered pH
the enzyme carbonic anhydrase catalyze the formation of carbonic acid in the presence of water and CO2
Name the molecule which diffuses into the red blood cell as it reach the alveolar tissue of the lungs during CO2 transport
(a)
Which of the following molecule will reduce the acidity of blood as it forms during CO2 transport from the tissue ?
Hemoglobinic acid (HHb)
Chloride ion (Cl-)
Hydrogen carbonate ion (HCO3-)
Red blood cell is permeable to only anions , as a results it face imbalance of electrochemical neutrality after bicarbonate ion (HCO3-) formation. Name the reaction which can prevent this condition.
(a)
Choose the correct statement/s which describe the structure of respiratory pigment in red blood cell.
(answers choices can be more than 1)
known as hemoglobin which is a conjugated protein (combination of globin and iron)
consist of 2 α −chains and 2 β− chains of globin polypeptides
each subunit of globin polypeptide are linked to a prosthetic group called haem
oxyhemoglobin (HbO8) shows a total of 8 O2 atoms attached to iron atoms found within each hemoglobin
One of the characteristic of Hb as repiratory pigments in red blood cell is, it allow Hb to associate and dissociate with O2 (a) as a results of different partial pressure of oxygen in the respiring tissue and the lung capillaries
The following correctly describes Hemoglobin as respiratory pigments..
hemoglobin has high affinity to O2 in lung capillaries due to high partial pressure of oxygen
carboxyhemoglobin is combination of hemoglobin (Hb) and carbon dioxide (CO2)
cooperative binding allows hemoglobin to easily release oxygen to the respiring tissue in response to reduction in partial pressure of oxygen
affinity of hemoglobin to oxygen is influenced by the pH , when pH is acidic, oxyhemoglobin dissociates.
Name the respiratory pigments found in the red blood cell.
(a)
The following structure cannot be found in mature red blood cell , EXCEPT..
nucleus
mitochondria
hemoglobin
Golgi body
The Oxygen Dissociation curve illustrate the relationship between _____I_____ with _____II____ at different partial ____III___of ____IV____
I- % of red blood cell saturation
II - CO2
III - pressure
IV-O2
I- % of hemoglobin saturation
II - O2
III - pressure
IV-CO2
I- % of hemoglobin saturation
II - O2
III - pressure
IV-O2
I- % of hemoglobin saturation
II - O2
III - affinity
IV-O2
the oxygen dissociation curve of hemoglobin is (a) shaped
Which of the following description incorrectly describes Oxygen Dissociation of Hemoglobin with oxygen ? (answers choice can be more than 1)
affinity of hemoglobin is highest in lungs and lowest in actively respiring tissue due to partial pressure and pH difference
high concentration of CO2 in the lungs causes hemoglobin to accept oxygen due to its high affinity
pH in the actively respiring tissue is low due to the presence of CO2 and % saturation of hemoglobin with oxygen drops due to oxyhemoglobin dissociates.
% saturation of hemoglobin with O2 is less than 20 mmHg in the respiring tissue due to high partial pressure of oxygen and oxyhemoglobin forms with high affinity
based on the graph shown,in the respiring tissue, the PO2 reduces to ____I_____ mmHg. the hemoglobin is __II____ % saturated and about ____III______ % of the oxyhemoglobin ___IV_____. this is due to the _____V_____ of hemoglobin to oxygen.
I- 13
II- 98
III - 2
IV-associate
V- high affinity
I- 3
II- 36
III - 64
IV-associate
V- lower affinity
I- 3
II- 36
III - 62
IV-dissociate
V- lower affinity
I- 13
II- 30
III - 68
IV-dissociate
V- high affinity
the oxygen dissociation curve explains the difference in (a) of hemoglobin at different partial pressure of oxygen and causing changes such as increasing or decreasing % of saturation of hemoglobin with O2
small openings found in the lower epidermis of leaves and young stems are called...
(a)
The following correctly describes stomata , EXCEPT...
stomata are important gaseous exchange and water vapor regulator during hot day in plants
stomata are sandwiched between 2 guard cells and only visible (opens) as the guard cell becomes turgid due to high water potential and osmosis from surrounding epidermal tissue
the guard cells has thicker outer cell wall which is flexible and elastic to allow guard cell to grow longer on the outside and allow stomata to opens
the guard cells are important photosynthetic cells will regulates the water potential to allow closing of stomata when water potential is higher inside.
The following substances can be regulated by stomata ( answer can be more than 1)
CO2
H2O
sugar
O2
Which of the following can be found in guard cell? ( answer can be more than 1)
vacuole
chloroplast
cellulose
nucleus
the guard cells can be turgid or flaccid to opens and closes stomata..this is due to the movement of water by (a)
The following events takes place during the day, EXCEPT..
activation of proton pump by the presence of blue light from the sun
K+ ion diffuses into the epidermal tissues surrounding the guard cells to reduce its water potential
movement of H+ out of guard cells by active transport in the presence of ATP
diffusion of both potassium and chloride ions reduces the water potential inside guard cells
Which of the following substances are formed as a results of presence of blue light? (answer choices can be more than 1)
malic acid
starch
H+
K+
When the turgor pressure increase, the guard cells will become (a)
Which of the following description happens during the dark? (answer choices can be more than 1)
activation of proton pump allowing H+ to exit the guard cell
diffusion of K+ ions out of the guard cells to the surrounding tissues decreasing the water potential in the surrounding tissue
decrease turgor pressure in guard cell
water osmosis out from guard cell to the surrounding tissue leading to flaccidity of guard cell
Which of the following ions plays important role to regulate plant water loss in response to the surrounding?
H+
K+
Cl-
Na+
