Biology Mcqs

Which tube joins kidneys and bladder?

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Which tube joins kidneys and bladder?

A. Urethra
B. Uretar
C. Inferno Verna Cava
D. Suprapubic Tube

The tubes which connect the kidney and urinary bladder are known as the ureter. Urine is formed in the kidney. From the kidney, urine is propelled into the urinary bladder through the tubes called ureters which are made of smooth muscle fibres.

What is the percentage of water present in our brain?

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What is the percentage of water present in our brain?

A. 85%
B. 95%
C. 97%
D. 73%

According to H.H. Mitchell, Journal of Biological Chemistry 158, the brain and heart are composed of 73% water, and the lungs are about 83% water. The skin contains 64% water, muscles and kidneys are 79%, and even the bones are watery: 31%.

What is called movement of cell against concentration gradient ?

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What is called movement of cell against concentration gradient ?A. Passive Transport
B. Osmosis
C. Active Transport
D. Diffusion

Active transport, this is the only transport method that can move species against their concentration gradient (from low to high concentration). Facilitated diffusion only moves species down their concentration gradient from high to low concentration.