A lever has efficiency 60% and mechanical advantage 4, the (i) Calculate effort required to lift 1000 N load. [250 N)
(ii) Calculate velocity ratio of the lever. [VR = 6.66]
(ii) Find out output work to turn load up to 20 m. [20,000 Nm]

Select the correct answer. which mutation is harmful to the organism? a. a mutation allowing moths to camouflage better on blackened tree bark b. a mutation making staphylococcus aureus resistant to the antibiotic methicillin c. a mutation inhibiting human immunodeficiency virus from attaching to and entering the cell d. a mutation causing uncontrolled cell division e. a mutation giving plant leaves a bitter taste to discourage herbivores from eating them

In "the man in the water," what was the remarkable occurrence that rosenblatt reported?

The current thought on the structure of the cell membrane is: a. a static phosphate sandwich of lipids b. a fluid-mosaic of phospholipids and proteins c. a bilayer of proteins with static lipid molecules d. an impermeable bilayer of protein molecules e. a static and permeable phospholipid single layer