What occurs during initiation of transcription?

Originally, a portion of a polypeptide looked like this: alanine, glutamic acid, glycine, serine, isoleucine   After a base-pair substitution mutation occurred, the same portion of the polypeptide looks like this: alanine, glutamic acid, glycine, cysteine, isoleucine   What type of mutation occurred, based on the change to the polypeptide?

Within a cell, where do transcription and translation occur?

A motor unit consists of which of the following?

Injection of calcitonin in an ovariectomized rat will stimulate osteoclast activity and inhibit calcium uptake deposition in long bones.

What is the value of the median for the following set of scores? Scores: 1, 2, 4, 6, 9, 13, 16, 23, 25, 26  

How are errors in DNA replication usually repaired?

In the image below, DNA replication is about to occur from left to right (in the direction of the black arrow). Where will the lagging strand be located?

What is phagocytosis?

Which of the following statements are true about codons?