T-ratios of some particular angles

Write down the measures of(a) some acute angles. (b) (b) some obtuse angles (give at least two examples of each)

Which one of the following palindromic base sequences in DNA can be easily cut at about the middle by some particular restriction enzyme?

Which one of the following palindromic base sequences in DNA can be easily cut at about the middle by some particular restriction enzyme?

Which one of the following palindromic base sequences in DNA can be easily cut a about the middle by some particular restriction enzyme ?

Which one of the following palindromic base sequences in DNA can be easily cut at about the middle by some particular restriction enzyme :

Which one of the following palindromic base sequences in DNA can be easily cut at about the middle by some particular restriction enzyme :

The ratio of the Emissive power to the absorption power of all substances for a particular wavelength is the same at given temperature. The ratio is known as

Which trigonometric ratios are negative for the angles: 315^@

Which trigonometric ratios are negative for the angles: -210^@