Sterol regulatory element binding proteins (SREBPs) are involved in regulating the synthesis of ____
a. proteins
b. lipids
c. nucleic acids
d. carbohydrates
e. amino acids
ANSWER: b
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Because peptidoglycan lies outside the plasma membrane, all steps in the complex synthesis process of this molecule takes place outside the cell.
Answer the following statement true (T) or false (F)
Which of the following are mechanisms to prevent polyspermy?
_____ altering composition of exterior egg coat _____ change in membrane potential of egg _____ cortical granule enzymes remove sperm receptors from egg _____ special proteins inside the egg compare the DNA of different sperm, choosing the most adapted one _____ toxic molecules exit the egg to attack extra sperm _____ vitelline envelopes lift off surface of egg
Which one of the following are structures in the body that are composed of two or more different tissue types joined together to perform a specific function?
A) tissues B) organs C) organ systems D) junctions E) body cavities
A heart with three chambers, one atrium, and two ventricles is shared by _____.
A. reptiles and mammals B. reptiles and amphibians C. amphibians and mammals D. birds and mammals E. birds and reptiles