Proteins are made from long chains of smaller molecules called amino acids. These long chains are folded into particular shapes. This is important in relation to how antibodies and enzymes work. Enzymes are biological catalysts. There are optimum temperatures and pH values at which their activity is greatest.
It costs just $0.25 to send a text message from the U.S. to an international number. For customers who frequently send text messages to family or friends overseas, AT&Tâs International Long Distance Messaging package includes 100 text messages sent from the U.S. for $10 a month.
Additional costs: Sending text message internationally typically is not included in text plans. For example, AT&T charges $10 to send 100 international texts per month. Verizon charges per text sent and received , and rates vary by country, but generally range from $0.05-$0.50 per text.