What is the importance of the blood-testis barrier?
a. it prevents spermatids from being released from the seminiferous tubule in an immature state.
b. it ensures that sperm remain isolated from ova until a mature ovum has reached an appropriate fertilization location in the female reproductive tract.
c. it prevents escape of membrane antigens of differentiating sperm through the basal lamina and into the blood, where they would activate the immune system.
d. it forms a continuous barrier between sustentocytes and developing spermatocytes to prevent cross-contamination of genetic material.

Which ideas did your answer contain? check all that apply. no food for organisms no oxygen in the atmosphere no trees or flowering plants no products based on trees or plants (building materials, medicines, fuels, fibers) no fossil fuels

4. rat liver is able to metabolize glucose by both the glycolytic and the pentose phosphate pathway. which of the following are properties of both the glycolytic and pentose phosphate pathway? a. nad+ is involved b. co2 is liberated c. phosphate esters are intermediates d. glyceraldehyde 3-phosphate is an intermediate e. fructose 6-phosphate is an intermediate4. rat liver is able to metabolize glucose by both the glycolytic and the pentose phosphate pathway. which of the following are properties of both the glycolytic and pentose phosphate pathway? a. nad+ is involved b. co2 is liberated c. phosphate esters are intermediates d. glyceraldehyde 3-phosphate is an intermediate e. fructose 6-phosphate is an intermediate

What is the most common structure of volcanoes?