Depending on the Species of Organism,mitochondrial DNA Codes for About

question 27

Multiple Choice

Depending on the species of organism,mitochondrial DNA codes for about 13 proteins;however,these proteins account for only a small proportion of the proteins found in mitochondria.The other proteins are coded for by nuclear DNA.Which of the following helps explain how these proteins find their way to the mitochondria?

• A)signal sequences
• B)random transport vesicles
• C)attachment of ribosomes to outer mitochondrial pores and direct deposition into the inner mitochondrial compartment
• D)mRNAs that are manufactured in the nucleus,but translated by mitochondrial ribosomes

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Definitions:

Seminal Fluid

A biofluid that contains spermatozoa and is secreted by the male reproductive organs, facilitating transport and survival of sperm during reproduction.

Spermatogenesis

The process by which a sperm develops from a spermatid.

Seminiferous Tubules

Narrow, coiled tubules within the testes where sperm are produced.

Cremaster

A muscle that raises and lowers the testes in response to temperature changes and sexual arousal, helping regulate testicular temperature.