Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_140968_1 ( size___s_base_pair__ VARCHAR, molecular_weight_kda VARCHAR )

### Question ###
How many base pairs are there if the molecular weight is 102?

### Accurate SQL ###

SELECT COUNT(size___s_base_pair__) FROM table_140968_1 WHERE molecular_weight_kda = "102"