Ethio Quizzes

Most common Biology Questions for Entrance Exam from : Nervous System Parts and Functions

1. The basic functional unit of the nervous system is the:
  a) Neuron
  b) Neuroglia
  c) Axon
  d) Dendrite

2. Which part of a neuron typically receives signals from other neurons?
  a) Axon
  b) Myelin sheath
  c) Dendrite
  d) Synapse

3. The long, slender projection of a neuron that conducts electrical impulses away from the cell body is the:
  a) Dendrite
  b) Axon
  c) Synapse
  d) Neuroglia

4. What is the function of the myelin sheath?
  a) To transmit signals to the next neuron
  b) To receive signals from other neurons
  c) To speed up the conduction of nerve impulses
  d) To nourish the neuron

5. The gap between two neurons where neurotransmitters are released is called the:
  a) Axon
  b) Dendrite
  c) Synapse
  d) Myelin sheath

6. Which of the following is a chemical messenger that transmits signals between neurons?
  a) Myelin
  b) Neurotransmitter
  c) Action potential
  d) Membrane potential

7. The central nervous system (CNS) consists of:
  a) The brain and spinal cord
  b) The cranial and spinal nerves
  c) The sensory and motor neurons
  d) The sympathetic and parasympathetic divisions

8. Which part of the brain is responsible for higher-level functions, such as thinking, memory, and language?
  a) Cerebellum
  b) Brainstem
  c) Cerebrum
  d) Thalamus

9. The part of the brain that coordinates movement and balance is the:
  a) Cerebrum
  b) Cerebellum
  c) Medulla oblongata
  d) Hypothalamus

10. Which part of the brainstem is involved in regulating heart rate and breathing?
   a) Cerebellum
   b) Pons
   c) Medulla oblongata
   d) Thalamus

11. The peripheral nervous system (PNS) includes:
  a) The brain and spinal cord
  b) All the nerves outside the brain and spinal cord
  c) Only the sensory nerves
  d) Only the motor nerves

12. Which division of the autonomic nervous system is responsible for the "fight-or-flight" response?
  a) Parasympathetic
  b) Somatic
  c) Sympathetic
  d) Enteric

13. Which division of the autonomic nervous system is responsible for "rest and digest" functions?
  a) Sympathetic
  b) Sensory
  c) Motor
  d) Parasympathetic

14. Sensory neurons transmit information from:
  a) The brain to the muscles
  b) The spinal cord to the brain
  c) Receptors to the central nervous system
  d) The central nervous system to the peripheral nervous system

15. Motor neurons transmit information from:
   a) Receptors to the central nervous system
   b) The brain to the sensory receptors
   c) The central nervous system to the muscles and glands
   d) The peripheral nervous system to the central nervous system

Answers:

1. a
2. c
3. b
4. c
5. c
6. b
7. a
8. c
9. b
10. c
11. b
12. c
13. d
14. c
15. c

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📌 Most common Chemistry Questions for Entrance Exam from  Chemical Bonding

1. Which type of chemical bond involves the sharing of electrons between atoms?
  a) Ionic bond
  b) Covalent bond
  c) Metallic bond
  d) Hydrogen bond

2. What type of bond is formed between a metal and a nonmetal?
  a) Covalent bond
  b) Metallic bond
  c) Ionic bond
  d) Hydrogen bond

3. Which of the following best describes an ionic bond?
  a) Sharing of electrons
  b) Attraction between positive and negative ions
  c) Delocalized electrons in a lattice
  d) Weak intermolecular force

4. In a covalent bond, how many electrons are shared between two atoms in a single bond?
  a) 1
  b) 2
  c) 3
  d) 4

5. Which type of bond is primarily responsible for the high electrical conductivity of metals?
  a) Ionic bond
  b) Covalent bond
  c) Metallic bond
  d) Hydrogen bond

6. What is the term for the force of attraction between molecules?
  a) Intramolecular force
  b) Intermolecular force
  c) Ionic attraction
  d) Covalent bond

7. Which of the following is the strongest type of intermolecular force?
  a) London dispersion forces
  b) Dipole-dipole interactions
  c) Hydrogen bonding
  d) Metallic bonding

8. What type of bond is found within a water molecule (H₂O)?
  a) Ionic bond
  b) Covalent bond
  c) Metallic bond
  d) Hydrogen bond

9. Which of the following molecules contains a polar covalent bond?
  a) O₂
  b) CH₄
  c) NaCl
  d) HCl

10. What property of an atom determines its ability to attract electrons in a chemical bond?
  a) Atomic mass
  b) Electronegativity
  c) Atomic radius
  d) Ionization energy

11. Which of the following compounds is most likely to exhibit ionic bonding?
  a) CO₂
  b) H₂O
  c) NaCl
  d) CH₄

12. Which of the following is an example of a molecule with a double bond?
  a) H₂
  b) N₂
  c) O₂
  d) CH₄

13. Which statement best describes the behavior of electrons in a metallic bond?
  a) Electrons are shared equally between atoms.
  b) Electrons are transferred from one atom to another.
  c) Electrons are delocalized and move freely through the structure.
  d) Electrons are held tightly within individual atoms.

14. What is a lone pair of electrons?
  a) Electrons shared between two atoms.
  b) Electrons involved in an ionic bond.
  c) Electrons that are not involved in bonding.
  d) Electrons in the outermost energy level.

15. Which of the following affects the strength of an ionic bond?
  a) The size of the atoms involved.
  b) The electronegativity difference between the atoms.
  c) The number of valence electrons.
  d) The number of lone pairs.

Answers:

1. b
2. c
3. b
4. b
5. c
6. b
7. c
8. b
9. d
10. b
11. c
12. c
13. c
14. c
15. b

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What type of bonding primarily stabilizes the beta sheet structure in proteins?
A) Ionic bonds 
B) Hydrogen bonds 
C) Van der Waals forces 
D) Disulfide bridges 

Answer: B) Hydrogen bonds

▎Question 4

Which of the following amino acids is most likely to disrupt an alpha helix due to its unique structure?
A) Alanine 
B) Glycine 
C) Leucine 
D) Glutamine 
Answer: B) Glycine

▎Question 5

In a beta sheet, the strands can be oriented in which of the following ways?
A) Only parallel 
B) Only antiparallel 
C) Both parallel and antiparallel 
D) Randomly oriented 

Answer: C) Both parallel and antiparallel

▎Question 6

Which type of secondary structure is often involved in turns and loops within proteins?
A) Alpha helix 
B) Beta sheet 
C) Random coil 
D) Beta turn 

Answer: D) Beta turn

▎Question 7

What is the significance of proline in the context of protein secondary structure?
A) It stabilizes alpha helices. 
B) It forms hydrogen bonds in beta sheets. 
C) It introduces kinks or bends in polypeptide chains. 
D) It enhances hydrophobic interactions. 

Answer: C) It introduces kinks or bends in polypeptide chains.

▎Question 8

Which of the following statements about secondary structures is FALSE?
A) Secondary structures are stabilized by hydrogen bonds between backbone atoms. 
B) Secondary structures are independent of the primary sequence of amino acids. 
C) Secondary structures can form motifs such as alpha-beta barrels. 
D) Secondary structures contribute to the overall three-dimensional shape of a protein. 

Answer: B) Secondary structures are independent of the primary sequence of amino acids.

▎Question 9

Which structural feature is NOT characteristic of an alpha helix?
A) Right-handed twist 
B) Side chains protruding outward from the helix 
C) Hydrogen bonds between every fourth amino acid 
D) Formation of disulfide bridges 

Answer: D) Formation of disulfide bridges

▎Question 10

The Ramachandran plot is used to visualize:
A) The tertiary structure of proteins. 
B) The potential conformations of the polypeptide backbone. 
C) The interactions between different protein subunits. 
D) The location of active sites in enzymes. 

Answer: B) The potential conformations of the polypeptide backbone

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📌 2009 EUEE  related with tense.

1) None of the furniture we   bought last week___  yet.
A) has arrived
B) arrived
C) have arrived
D) will have arrived

2) Classes begin only after you-------- registration.
A) Completed
B) Complete
C) Will complete
D) Had complete

3)Next week this time, I------------all my examinations.
A) am finishing
B) have finished
C) will finish
D) will have finished.

4) I am sure you___ a good time staying here with me this coming summer.
A) will have
B) should have
C) have
D) will be having

5) Did you know that Mary and Bedlu___ married next week?
A) are going to get
B) will be getting
C) will get
D) get

6) I am not good at Mathematics, but I __ any problem with my English.

A) had never have
B) have never had
C) never have
D) had never had

7) I was very sad to hear that your mother _.
A) has died
B) had died
C) dies
D) would die

8) I have now been admitted to the university of Mello and I am expected to be there in August.The semester__ half way there by the time the academic year begins here.
A) will be
B) would be
C) will have been
D) would have been

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