Q: What organ contributes about 60% of the volume of semen ? Choices: - complete vesicles - cilia - long vesicles - seminal vesicles A:
seminal vesicles

(Question)
Q: Which factor often changes a protein from an inactive form to an active form? Choices: - oxygen groups addition - lipid groups addition - nitrogen groups addition - phosphate groups addition A:
(Answer)
phosphate groups addition

Ques: Q: Fish have a circulatory system with a two-chambered what? Choices: - brain - lung - stomach - heart A:
Ans: heart

(Q).
Q: Activated macrophages and neutrophils discharge what that signals molecules that enhance an immune response? Choices: - alkaloids - pathogens - nucelotides - cytokines A:
(A).
cytokines

Ques:Q: What type of gas is used to fill glass tubes of lighted signs? Choices: - synthetic - inert - natural - noble A:

Ans:noble

Q: What do you call the hard case that surrounds the soft parts of some animals? Choices: - muscles - shell - membrane - exoskeleton A:
exoskeleton