EXHIBIT 31(a)

                            CERTIFICATION PURSUANT TO
                  SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Elazar Rabbani, Ph.D., certify that:

     1.   I have  reviewed this  Quarterly  Report on Form 10-Q of Enzo Biochem,
          Inc;

     2.   Based on my  knowledge,  this  report  does  not  contain  any  untrue
          statement  of a  material  fact  or  omit to  state  a  material  fact
          necessary to make the statements  made, in light of the  circumstances
          under which such  statements were made, not misleading with respect to
          the period covered by this report;

     3.   Based on my knowledge,  the financial statements,  and other financial
          information  included in this report,  fairly  present in all material
          respects the financial condition, results of operations and cash flows
          of the Company as of, and for, the periods presented in this report;

     4.   The  Company's  other  certifying  officer and I are  responsible  for
          establishing  and maintaining  disclosure  controls and procedures (as
          defined  in  Exchange  Act  Rules  13a - 15(e)  and 15d -  15(e))  and
          internal control over financial  reporting (as defined in Exchange Act
          Rules 13a-15(f) and 15d-15(f)) for the Company and have:

     (a)  Designed  such  disclosure  controls  and  procedures,  or caused such
          disclosure   controls  and   procedures  to  be  designed   under  our
          supervision,  to ensure  that  material  information  relating  to the
          Company, including its consolidated subsidiaries,  is made known to us
          by others  within those  entities,  particularly  during the period in
          which this report is being prepared;

     (b)  Designed such internal  control over  financial  reporting,  or caused
          such internal  control over  financial  reporting to be designed under
          our  supervision,   to  provide  reasonable  assurance  regarding  the
          reliability  of financial  reporting and the  preparation of financial
          statements for external purposes in accordance with generally accepted
          accounting principles;

     (c)  Evaluated the effectiveness of the Company's  disclosure  controls and
          procedures  and  presented  in this report our  conclusions  about the
          effectiveness of the disclosure controls and procedures, as of the end
          of the period covered by this report based on such evaluation; and

     (d)  Disclosed in this report any change in the Company's  internal control
          over  financial  reporting  that occurred  during the  Company's  most
          recent fiscal quarter that has materially  affected,  or is reasonably
          likely to  materially  affect,  the  Company's  internal  control over
          financial reporting; and

     5.   The Company's other certifying officer and I have disclosed,  based on
          our  most  recent   evaluation  of  internal  control  over  financial
          reporting,  to the Company's  auditors and the audit  committee of the
          Company's  board of directors (or persons  performing  the  equivalent
          functions):

     (a)  All significant  deficiencies and material weaknesses in the design or
          operation  of internal  control  over  financial  reporting  which are
          reasonably likely to adversely affect the Company's ability to record,
          process, summarize and report financial information; and

     (b)  Any fraud, whether or not material,  that involves management or other
          employees  who  have a  significant  role  in the  Company's  internal
          control over financial reporting.

Date:  March 12, 2007
                                                  By: /s/ Elazar Rabbani, Ph.D.
                                                      -------------------------
                                                  Elazar Rabbani, Ph.D.
                                                  Chief Executive Officer