Biology Questions

Q:

Receptors for hearing are located in the

A) Vestibule B) Tympanic membrane
C) Semicircular canals D) Cochlea
 
Answer & Explanation Answer: D) Cochlea

Explanation:

Receptors_for_hearing_are_located_in_the1537768165.jpg image

Receptors for hearing the organ of corti or the spiral organ is located in the the mammalian cochlea.

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Q:

The HIV retrovirus is particularly deadly because

A) I can become AIDS shortly afte being contracted B) It attacks the body immune system
C) Treatments can be dangerous for patients D) Its hard to diagnose accurately
 
Answer & Explanation Answer: B) It attacks the body immune system

Explanation:

HIV is a virus that damages the immune system. HIV is a lifelong condition, and without treatment, a person with HIV can develop AIDS.

The_HIV_retrovirus_is_particularly_deadly_because1563452540.jpg image

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Q:

Which describes how mRNA is used by a cell?

A) It is used to move information to other cells. B) It is used to check DNA for mutations.
C) It is used to replicate DNA for mitosis. D) It is used to transfer genetic information.
 
Answer & Explanation Answer: D) It is used to transfer genetic information.

Explanation:

A RNA copy of a DNA gene is called as messenger RNA or mRNA. mRna is used in translation because information is translated from one language (nucleotides) into another (amino acids).

 

Hence, mRNA is used to transfer genetic information by a cell.

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Q:

What is the function of reverse transcriptase?

A) synthesis of RNA from protein B) synthesis of DNA from an RNA template
C) synthesis of protein from DNA D) synthesis of DNA from protein
 
Answer & Explanation Answer: B) synthesis of DNA from an RNA template

Explanation:

A reverse transcriptase (RT) is an enzyme used to generate complementary DNA (cDNA) from an RNA template by a process called Reverse Transcription.

In brief its function is that copies all or part of the virus RNA (retroviruses are RNA-only) as DNA which can then be integrated into the DNA of the host organism.

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Q:

Which part of the brain is responsible for consciousness?

A) Brain stem B) Cerebrum
C) Cerebellum D) None of the above
 
Answer & Explanation Answer: B) Cerebrum

Explanation:

The brain has three main parts the cerebrum, cerebellum and brainstem. As cerebrum is the largest part of the brain it is divided into two hemispheres i.e, right and left. It performs many functions like vision, hearing, touch, learning, consciousness, emotions, etc...

which_part_of_the_brain_is_responsible_for_consciousness1563518225.png image

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Q:

What organelle carries out photosynthesis?

A) Chloroplasts B) Ribosomes
C) Chromosomes D) All of the above
 
Answer & Explanation Answer: A) Chloroplasts

Explanation:

Chloroplasts contains chlorophyll, the green substance in plants that allows them to create food from carbon dioxide and water called as photosynthesis.

 

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Q:

The term facultative anaerobe refers to an organism that

A) Uses oxygen or grows without oxygen. B) Requires less oxygen than is present in air.
C) Prefers to grow without oxygen. D) Is killed by oxygen.
 
Answer & Explanation Answer: A) Uses oxygen or grows without oxygen.

Explanation:

The term facultative anaerobe refers to an organism that which uses oxygen when it is present or grows without oxygen when it is not there.

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Q:

Cranial bones develop

A) within fibrous membranes B) within osseous membranes
C) from cartilage models D) from a tendon
 
Answer & Explanation Answer: A) within fibrous membranes

Explanation:
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