Which of the following is NOT true of cell membranes? 

A. They are composed of four carbohydrate layers.
B. They contain protein molecules.
C. They regulate movement of some substances into and out of the cell.
D. They contain phospholipids.


A. They are composed of four carbohydrate layers.

Biology & Microbiology

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The observable expression of the genes present in an organism is called its  

A.  phenotype. B.  genotype. C.  pedigree. D.  karyotype.

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What is the main factor that drives ozone

formation?

a. cloud cover b. rainfall c. time of day d. sunlight e. season

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One of the components used during photosynthetic electron transport is ferredoxin, a nonheme iron protein.

Answer the following statement true (T) or false (F)

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The homeostatic interaction between the endocrine system and which other system is demonstrated by

insulin and growth hormone supporting delivery of nutrients to all cells? a. circulatory system b. lymphatic system c. digestive system d. skeletal system e. muscular system

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