Question

cross arms of the myosin monomer consists of​

Answer 1

Answer:

The globular part of the myosin is called Head. It helps to form cross-bridges by attaching with actin.  

The middle oblique structure that connects head and tail of myosin is the neck. Head and neck together called as Cross arm. They are responsible for forming cross bridges and help in wilding of actin over myosin.  

The topmost area on the head of the myosin is the actin-binding site. This site helps in attachment of myosin to actin.  

ATP binding site is present anteriorly below actin binding site. This site attaches to the ATP and forms ADP. The energy is used for sliding of cross bridges.  

So the correct option is D.

Answer 2

• ᴛʜᴇ ɢʟᴏʙᴜʟᴀʀ ᴘᴀʀᴛ ᴏғ ᴛʜᴇ ᴍʏᴏsɪɴ ɪs ᴄᴀʟʟᴇᴅ ʜᴇᴀᴅ. ɪᴛ ʜᴇʟᴘs ᴛᴏ ғᴏʀᴍ ᴄʀᴏss-ʙʀɪᴅɢᴇs ʙʏ ᴀᴛᴛᴀᴄʜɪɴɢ ᴡɪᴛʜ ᴀᴄᴛɪɴ.
• ᴛʜᴇ ᴍɪᴅᴅʟᴇ ᴏʙʟɪǫᴜᴇ sᴛʀᴜᴄᴛᴜʀᴇ ᴛʜᴀᴛ ᴄᴏɴɴᴇᴄᴛs ʜᴇᴀᴅ ᴀɴᴅ ᴛᴀɪʟ ᴏғ ᴍʏᴏsɪɴ ɪs ᴛʜᴇ ɴᴇᴄᴋ. ʜᴇᴀᴅ ᴀɴᴅ ɴᴇᴄᴋ ᴛᴏɢᴇᴛʜᴇʀ ᴄᴀʟʟᴇᴅ ᴀs ᴄʀᴏss ᴀʀᴍ. ᴛʜᴇʏ ᴀʀᴇ ʀᴇsᴘᴏɴsɪʙʟᴇ ғᴏʀ ғᴏʀᴍɪɴɢ ᴄʀᴏss ʙʀɪᴅɢᴇs ᴀɴᴅ ʜᴇʟᴘ ɪɴ ᴡɪʟᴅɪɴɢ ᴏғ ᴀᴄᴛɪɴ ᴏᴠᴇʀ ᴍʏᴏsɪɴ.
• ᴛʜᴇ ᴛᴏᴘᴍᴏsᴛ ᴀʀᴇᴀ ᴏɴ ᴛʜᴇ ʜᴇᴀᴅ ᴏғ ᴛʜᴇ ᴍʏᴏsɪɴ ɪs ᴛʜᴇ ᴀᴄᴛɪɴ-ʙɪɴᴅɪɴɢ sɪᴛᴇ. ᴛʜɪs sɪᴛᴇ ʜᴇʟᴘs ɪɴ ᴀᴛᴛᴀᴄʜᴍᴇɴᴛ ᴏғ ᴍʏᴏsɪɴ ᴛᴏ ᴀᴄᴛɪɴ.
• ᴀᴛᴘ ʙɪɴᴅɪɴɢ sɪᴛᴇ ɪs ᴘʀᴇsᴇɴᴛ ᴀɴᴛᴇʀɪᴏʀʟʏ ʙᴇʟᴏᴡ ᴀᴄᴛɪɴ ʙɪɴᴅɪɴɢ sɪᴛᴇ. ᴛʜɪs sɪᴛᴇ ᴀᴛᴛᴀᴄʜᴇs ᴛᴏ ᴛʜᴇ ᴀᴛᴘ ᴀɴᴅ ғᴏʀᴍs ᴀᴅᴘ. ᴛʜᴇ ᴇɴᴇʀɢʏ ɪs ᴜsᴇᴅ ғᴏʀ sʟɪᴅɪɴɢ ᴏғ ᴄʀᴏss ʙʀɪᴅɢᴇs.♡