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.
1 Verizon offers unlimited talk and text plans that also include limited data plans that start at $80-$90, depending on the type of phone used. 2  Unlimited talk plans through AT&T start at $70 per month. 3  Pre-paid cell phone plans typically cost $30-$100 per month, depending on usage needs. Depending on the plan, text, IM (Instant Messaging), picture and video messaging can also cost extra. 2  Unlimited text messaging typically costs $20 per month. 3  See: How Much Does Text Messaging Cost. 4  There are state and local taxes on monthly plans, but these are generally minimal.