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# CBSE Free Doubts and Solutions

### CBSE - XI Science - Biology

## Why is cisternae associated with 60s subunit and not with 40 S ribosome?

**pb_ckt**20th April 2019, 11:06 PM

### CBSE - XI Science - Biology

## 1.Why can't polar molecules not pass through the non-polar lipid bilayer? 2.What is the carrier protein required to facilitate the transport of polar molecules?

**pb_ckt**20th April 2019, 11:04 PM

### CBSE - X - Mathematics

## If alpha and beta are the zeros of the quadratic polynomial 5xsquare -2x-1 then find the polynomial whose zeros are 1/alpha and 1/beta

**asharaikwar19**20th April 2019, 9:46 PM

### CBSE - XII Science - Physics

## Hi explain the correct choice

**jain.pradeep**20th April 2019, 7:36 PM

### CBSE - IX - Chemistry

## separation technique used to separate 1. mustard oil from water 2. ceram from milk 3.components of ink 4.aceton from water

**ayushkumarjena07**20th April 2019, 7:06 PM

### CBSE - XII Science - Mathematics

## Show that if a is any m x n matrix, then ImA = A and AIn = A Please explain step by step that how (Im)ir (a)rj= (a)ij

**govtsecschoolnayaganv051**20th April 2019, 4:18 PM