Which four elements make up approximately 96% of living matter?
A) Carbon, oxygen, calcium, sulfur
B) Carbon, hydrogen, nitrogen, oxygen
C) Oxygen, hydrogen, calcium, sodium
D) Carbon, phosphorus, hydrogen, sulfur
E) Carbon, sodium, chlorine, magnesium
B
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Weak bonds are important for the ______________ structure of proteins
A. primary B. secondary C. tertiary D. quarternary E. secondary, tertiary, AND quarternary
Plants can remove harmful chemicals from the soil by the process of
A. glandular secretion by leaves. B. CO2 activation. C. phytoremediation. D. fertilization. E. root nodule formation.
Genes that affect the __________ system often affect behavior. Fill in the blank(s) with the appropriate word(s)
Gram ________ bacteria stain purple and have a very simple cell wall, only consisting of peptidylglycan:
A. Positive B. Negative