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What is an intron?

An intervening sequence that does not encode for proteins

The portion of the transcript that encodes for protein

A person with a recessive allele that the dominant allele silences

One of a pair of genes that is inherited from a parent

Answer and Explanation

The Correct Answer is A

A. An intervening sequence that does not encode for proteins:

Introns are non-coding sequences within a gene that are removed during RNA splicing before translation.

B. The portion of the transcript that encodes for protein:

This describes an exon, not an intron.

C. A person with a recessive allele that the dominant allele silences:

This describes a carrier in genetics, not an intron.

D. One of a pair of genes that is inherited from a parent:

This describes an allele, not an intron.

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Correct Answer is A

Explanation

A. Condyloma acuminata:

These are genital warts, a hallmark of HPV infection.

B. Diarrhea:

Not typical of HPV; more common with gastrointestinal infections.

C. Urethritis:

Urethritis is more commonly caused by gonorrhea or chlamydia.

D. Penile edema:

Swelling may occur secondarily but is not a classic primary symptom.

A. It is the process by which a substance requires energy to pass through a membrane against a concentration gradient B. It is the process by which solvent molecules pass through a semipermeable membrane from a less concentrated solution into a more concentrated one C. It is the process by which molecules move from high-concentration areas to low-concentration areas. D. It is the process by which certain molecules pass through the plasma membrane with the help of carrier proteins.

Correct Answer is C

Explanation

A. It is the process by which a substance requires energy to pass through a membrane against a concentration gradient:

This describes active transport, not diffusion. Active transport requires ATP to move substances against their gradient.

B. It is the process by which solvent molecules pass through a semipermeable membrane from a less concentrated solution into a more concentrated one:

This describes osmosis, not diffusion. Osmosis specifically refers to the movement of water.

C. It is the process by which molecules move from high-concentration areas to low-concentration areas:

This correctly defines diffusion - the passive movement of molecules down their concentration gradient.

D. It is the process by which certain molecules pass through the plasma membrane with the help of carrier proteins:

This describes facilitated diffusion, which still moves substances down their gradient but requires a protein carrier.

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What is an intron?

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