Which Is True About Mediated Transport Across Cell Membranes

question 59

Multiple Choice

Which is true about mediated transport across cell membranes?

• A)It refers to the movement of ions through protein channels.
• B)It refers both to simple diffusion and to the active transport of molecules.
• C)It is characterized by saturable carriers and a maximum velocity of transport.
• D)As the concentration gradient across a membrane increases,the transport rate always increases.
• E)It is nonspecific;any transporter can transport any molecule across the cell membrane.

Evaluate the characteristics of well-composed and poorly written buffers in negative messages.

Describe the elements of a bad-news message when using the direct approach.

Identify and execute the steps an organization should take to respond to rumors and negative information in social media.

Identify and describe different types of joint articulations and movements.

---

Definitions:

Transcription

The process by which the genetic information in DNA is copied to messenger RNA (mRNA), initiating protein synthesis.

Repressors

Proteins that bind to specific DNA sequences to inhibit the transcription of certain genes, regulating gene expression.

DNA Binding Sites

Specific sequences within a DNA molecule that are recognized and bound by other molecules, such as proteins, to regulate gene expression.

Post-Transcriptional Modification

Processes that modify RNA transcripts after transcription, affecting stability, localization, and translation into proteins.