Q: A membrane has what property if it can control what molecules or ions enter or leave the cell? Choices: - indiscreet permeability - impermeability - susceptible permeability - selective permeability A:
selective permeability

(Question)
Q: What are the tiny packets of energy the sun gives off called? Choices: - ions - electrons - neutrons - photons A:
(Answer)
photons

Ques: Q: What is another name for collar cells? Choices: - enzymes - sporozoans - clutches - choanocytes A:
Ans: choanocytes

(Q).
Q: What types of orbits do comets usually have? Choices: - vertical - convex - spectral - elliptical A:
(A).
elliptical

Ques:Q: The desire to understand how and why things happen is shared by all branches of what? Choices: - population - society - government - science A:

Ans:science

Ques:Q: What play an important role in the modulation of the nuclear chain reaction? Choices: - radiation rods - control neutrons - particle rods - control rods A:

Ans:
control rods