biology mcqs test no 2

There are 10 Mcqs.Choose the best option.Write all of your answers in one comment (like 1A,2B,3B...)

(1)Which process does not occur during the formation of messenger RNA?
A- condensation
B- polymerisation
C- replication
D- transcription

(2)Enzymes are ……1…… proteins, made up of polypeptides.
A gene is a sequence of ……2……, which are parts of a ……3…… molecule coding for a polypeptide.
Which words correctly complete gaps 1, 2 and 3 in the sentences?
Transcription and translation mcq

(3)Why does the red blood cell count of humans increase when they remain at high altitudes?
A- Haemoglobin is not saturated with oxygen in the lungs.
B- The partial pressure of oxygen is higher.
C- The percentage of oxygen in the air has decreased.
D- There is more carbon dioxide, increasing the Bohr effect

(4)An oxygen molecule diffuses directly from the air in an alveolus to haemoglobin in a red blood cell.What is the minimum number of cell surface membranes through which this molecule must pass?
A) 2
B) 3
C) 4
D) 5

(5)The diagram shows some of the processes that are involved in the cycling of nitrogen in an ecosystem.
nitogen cycle

Which type of bacterium is found at X?
A- decomposing
B- denitrifying
C- nitrifying
D- nitrogen fixing

(6)A tree carries out photosynthesis and provides organic compounds for other organisms in a forest.
It takes carbon dioxide from and returns oxygen to the atmosphere. It takes water from the soil into its roots and its leaves lose water to the atmosphere. Many other organisms live in the tree.
Which term describes the tree?
 A) niche
B) community
C) ecosystem
D) trophic level

(7)The following are all features of eukaryotic cells.
1- chloroplast
2- Golgi apparatus
3- lysosome
4- mitochondrion
5- nucleus
Which of these has a single membrane?
A) 1 and 2
B) 2 and 3
C) 3 and 4
D) 4 and 5

(8)The diagram shows four molecules
Monosaccharides condensation

Which two molecules condense to form sucrose?
A) P and Q
B) P and S
C) R and Q
D) R and S

(9) Heisenberg uncertainty principle is for Populations which are
A evolving
B non-evolving
C both A and B
D none of these

(10)Which of the statements about polysaccharides can be used to describe both glycogen and amylopectin?
1 contains 1,4 glycosidic bonds
2 contains 1,6 glycosidic bonds
3 polymer of α–glucose
A) 1 and 2 only
B) 1 and 3 only
C) 2 and 3 only
D) 1, 2 and 3

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