Apex domains cannot have CNAME records.
Question and response
Question
dig ukrhost.biz. NS
Answer
ukrhost.biz. 5 NS dns2.ukrhost.com.ua.
ukrhost.biz. 5 NS dns1.ukrhost.com.ua.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0