Calling all biochemists
Oct. 22nd, 2003 10:21 pm![[personal profile]](https://www.dreamwidth.org/img/silk/identity/user.png){kind=small}
percivalI have the sinking feeling that the following definition of active transport from my Tucker 2000 Anatomy and Physiology textbook - you know, the crappy one - is just RONG:
"active transport - when substances are too large to pass directly through the membrane, or are not soluble in fat, a carrier substance takes them from the outside to the inside. Glucose and amino acids are both transferred by active transport. It is active because energy is used."
Now, according to my other textbook, energy is ONLY used if these substances do NOT move along the concentration gradient. So, the sodium/potassium pump is active, because the cell actively maintans low Na and high K concentrations in the cytoplasm, but the facilitated transport of glucose using a glucose transporter is PASSIVE, because the glucose concentration inside the cell is kept low by chemical processes.
Grumble. The Tucker book is the ITEC standard text book. They want me to learn RONG things for my EXAM???
Please help. any help (e-mails, too) would be mucho appreciated.
"active transport - when substances are too large to pass directly through the membrane, or are not soluble in fat, a carrier substance takes them from the outside to the inside. Glucose and amino acids are both transferred by active transport. It is active because energy is used."
Now, according to my other textbook, energy is ONLY used if these substances do NOT move along the concentration gradient. So, the sodium/potassium pump is active, because the cell actively maintans low Na and high K concentrations in the cytoplasm, but the facilitated transport of glucose using a glucose transporter is PASSIVE, because the glucose concentration inside the cell is kept low by chemical processes.
Grumble. The Tucker book is the ITEC standard text book. They want me to learn RONG things for my EXAM???
Please help. any help (e-mails, too) would be mucho appreciated.
