If cordycepin triphosphate is added to a cell-free transcription reaction, the nucleotide is added onto the growing rna chain but no more nucleotides can then be added. the added cordycepin is always found at the 3' end of an rna. examine the structure of cordycepin and explain why it ends transcription.

Select all of the answers that apply. examine the following rock strata. using the laws of biostratigraphy, which of the following statements are true about the relative ages of the rock layers and intrusion? intrusion a is older than all of the rock layers. layer b is older than intrusion a. layers c, d, and e are older than intrusion a. intrusion a is older than layers c, d, and e. without additional information, you cannot tell the relative ages of intrusion a and rock layers c, d, and e. layer b is older than layers c, d, and e.