The hemoglobin molecule
A. has four subunits of two types.
B. has two subunits that can be formed from four types.
C. is involved in amino acid metabolism.
D. acts as a cell surface receptor.
E. is controlled by a single gene.
A
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Which factors govern the rate of primary productivity in freshwater and marine ecosystems?
a. availability of water b. availability of sunlight and nutrients only c. depth of the water only d. depth of the water and availability of sunlight and nutrients e. availability of oxygen
Prions cause damage to the brain by
a. causing normal proteins to change shape. b. enzymatically destroying brain cells. c. cleaving all the oxygen from that area of the brain. d. binding to bacteria in the brain and stimulating them to kill tissue. e. none of these.
Which of the following is found in both eukaryotic and prokaryotic cells?
A) endoplasmic reticulum B) ribosomes C) nucleus D) mitochondria
Which statement about an ecosystem is incorrect?
What will be an ideal response?