Answers
1.
d. Movement of sodium and potassium across the cell membrane against their
concentration gradients.
2.
, B. A hypothesis
3.
D. urea
4.
Efferent arteriole, higher
5. Carbon has an atomic number of 6. Which of the following is true about isotope c-12?
a. C-12 possesses 6 neutrons and 6 protons in its nucleus
b. C-12 possesses 7neutrons and 5 protons in its nucleus
c. C-12 possesses 7 neutrons and 5 protons in its nucleus
d. C-12 possesses 6 neutrons and 6 protons in its nucleus 6. Which of the following best
describes adaptive immunity?
a. The body barrier defences,such as mucous membranes and secretions