ETHIOPIAN SECONDARY SCHOOL LEAVING CERTIFICA
EXAMINATION (ESSLCE)
SUBJECT CODE_06
Number of Items: 100
1.
2.
BIOLOGY
HAMLIE, 2015 JULY 2023
BOOKLET CODE 478
Time Allowed: 2 Hours
Which one of the following descriptions of proteins is correctly matched
with its function in a cell membrane?
Pasive transport
A. Channel proteins - larger molecules can pass through them
Carrier proteins-specific ions can pass along them
B.
C. Peripheral protein - anchor integral proteins to the cytoskeleton
Glycoprotein - reduces the fluidity of the membrane
D.
In the aerobic cellular respiration
A.
pyruvate enters into the mitochondria for further stages.
glycolysis takes place in the mitochondria.
Krebs cycle takes place in the cytoplasm.
B.
C.
D.
electron transport chain takes place in the cytoplasm.
3.
4.
Suppose a hypothetical cell of 15% solute concentration is put in a beaker
containing 90% water and 10% solute. In which way will the water move?
A.
B. Both into and out of the beaker D.
Both into and out of the cell C.
From the cell to the beaker
From the beaker to the cell
Which one of the following is correct about transport of substances across
the cell membrane?
A.
B.
C.
D.
Passive transport - particles require energy in the form of ATP to
derive the transport
Active transport - particles move from low to higher concentration
using carrier proteins
Simple diffusion - large particles transported through channel proteins
Facilitated diffusion - particles move from high water potential to
lower one
In a dihybrid self-crossing of a plant with genotype DdCc, 3600 offspring
were produced. How many of the offspring will have the ddcc genotype?
5.
A.
150
B.
225
C.
300
D.
450
Biology % 2015/2023
EAES/ESSLCE

Channel proteins and carrier proteins play key roles in facilitated transport across cell membranes. Only active transport involves transport proteins. The plasma membrane is essential for controlling the movement of substances in and out of the cell.

Explanation:

Channel proteins and carrier proteins are both involved in facilitated transport across cell membranes. Channel proteins form hydrophilic channels that allow specific substances to pass through, while carrier proteins bind with substances and aid their diffusion through the membrane.

Only active transport involves transport proteins, not just passive transport. Oxygen and carbon dioxide can indeed squeeze between the lipid molecules in the plasma membrane, and ions do not easily diffuse across the cell membrane by simple diffusion.

The plasma membrane is crucial for controlling what enters and leaves the cell, serving as a highly selective barrier that regulates the movement of substances in and out of the cell.

Learn more about Cell Membrane Transport here:

https://brainly.com/question/14499201