Biology Questions

Q:

Unlike eutherians, both monotremes and marsupials

A) have some embryonic development outside the uterus B) are found in Australia
C) lay eggs D) lack nipples
 
Answer & Explanation Answer: A) have some embryonic development outside the uterus

Explanation:
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Q:

Which step happens first in DNA replication?

A) Initiation B) Elongation
C) Termination D) None of the above
 
Answer & Explanation Answer: A) Initiation

Explanation:

In the first step of DNA replication called initiation, the DNA pair gets unwidened.

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Q:

Which one of the following pairs about organ/part that helps in locomotion is not correctly matched?

A) Euglena : Flagellum B) Paramecium : Cilia
C) Nereis : Pseudopodia D) Starfish : Tubefeet
 
Answer & Explanation Answer: C) Nereis : Pseudopodia

Explanation:

Euglena move by a flagellum (plural ‚ flagella), which is a long whip-like structure that acts like a little motor.

The paramecium uses its cilia to sweep the food along with some water into the cell mouth after it falls into the oral groove.

The underside of the starfish is covered with hundreds of tube feet, which it uses for walking around, for attaching tightly to rocks, and for holding on to prey.

Nereis possess setae and parapodia for locomotion

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Q:

Bacteria and archaea are similar in which of the following?

A) Plasma membrane ester linkage B) Possessing prokaryotic cells
C) Peptidoglycan cell walls D) Methionine as the start signal for protein synthesis
 
Answer & Explanation Answer: B) Possessing prokaryotic cells

Explanation:

Bacteria and archaea are similar in possessing prokaryotic cells.

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Q:

What base does guanine pair with?

A) Adenine B) Thymine
C) Uracil D) Cytosine
 
Answer & Explanation Answer: D) Cytosine

Explanation:

In DNA, the chemicals are Adenine, thymine, guanine and cytosine. They always pair as basepairs like Adenine with Thymine and Guanine with Cytosine.

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Q:

Polyploidy is involved in which of the following examples?

A) XYY males B) Some plants alternate between haploid and diploid phases
C) XO females D) A normal watermelon has 22 chromosomes but seedless watermelons have 33 chromosomes
 
Answer & Explanation Answer: D) A normal watermelon has 22 chromosomes but seedless watermelons have 33 chromosomes

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Q:

Biological membranes are composed of

A) Phospholipids B) Proteins
C) Carbohydrate groups D) All of the above
 
Answer & Explanation Answer: D) All of the above

Explanation:

Biological membranes are composed of phospholipids, Proteins and Carbohydrate groups attached to lipids and proteins.

 

Biological_membranes_are_composed_of1559036778.jpg image

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Q:

Which statement concerning the diagnosis of ADHD is true?

A) Boys are more likely to be diagnosed with ADHD than girls B) Most children "outgrow" symptoms of ADHD
C) About 20 percent of school-age children are diagnosed with ADHD D) Racial minority status is a good predictor of being diagnosed with ADHD
 
Answer & Explanation Answer: A) Boys are more likely to be diagnosed with ADHD than girls

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