Biology Questions

Q:

Cellulose is a major component of the

A) Pythium B) Pseudomonas
C) Xanthomonas D) Saccharomyces
 
Answer & Explanation Answer: A) Pythium

Explanation:
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Q:

Which among the following hormone can be used as a drug to treat cardiac arrest and some other cardiac problems?

A) Epinephrine B) Insulin
C) Thyroxin D) Calcitonin
 
Answer & Explanation Answer: A) Epinephrine

Explanation:
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Q:

Where does translation occur?

A) Nucleus B) Ribosomes
C) Cytoplasm D) mitochondrion
 
Answer & Explanation Answer: C) Cytoplasm

Explanation:

Right after that, the mRNA enters the cytoplasm through nuclear pores. There, it could be translated into proteins by ribosomes. This process is called translation.

 

Translation occurs in the cytoplasm whereas transcription occurs in the nucleus.

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Q:

Do plant cells have Mitochondria?

A) Yes B) No
C) Can't be determined D) None
 
Answer & Explanation Answer: A) Yes

Explanation:

Yes, plant cells have Mitochondria.

While plant cells have chloroplasts to photosynthesize, they also require ATP for cellular functions, and do use oxygen to break down some of the sugar they produce in order to generate that ATP. They need mitochondria for this.

In particular, at night when there is no light, plants undergo cellular respiration since there is no sunlight to photosynthesize.

They do, however, produce far more sugar and oxygen through photosynthesis than they use up in respiration.

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Q:

Which of these best describes genetic drift?

A) Random fluctuations in the gene frequencies within a population Eliminate B) The combining of alleles to create more genetic variations within a population
C) The movement of alleles between population D) A planned method to reduce the number of inferior genes in a population
 
Answer & Explanation Answer: A) Random fluctuations in the gene frequencies within a population Eliminate

Explanation:

Random fluctuations in the gene frequencies within a population Eliminate is the one which best describes genetic drift.

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Q:

Which statement correctly describes the role of chance in evolution?

A) An allele that increases evolutionary fitness cannot be lost from a population by chance events. B) The ultimate source of new alleles is mutation, random changes in the nucleotide sequences of an organism's DNA
C) Evolutionary change proceeds by an accumulation of changes that occur by chance. D) None of the above
 
Answer & Explanation Answer: B) The ultimate source of new alleles is mutation, random changes in the nucleotide sequences of an organism's DNA

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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:

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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