Conifers are characterized by all of the

following EXCEPT
a. thick cuticles.
b. intolerance to warm climates.
c. needle-shaped leaves.
d. recessed stomata.
e. adaptations for conserving water


B

Biology & Microbiology

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The proteins that catalyze chemical reactions in the body are called

A) enzymes. B) coenzymes. C) antioxidants. D) high-density lipoproteins (HDLs).

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Four of the five answers represent events that occurred when free oxygen (O2) became available in the atmosphere. Select the exception

a. aerobic respiration emerged. b. some organisms changed their metabolism. c. some species that could not detoxify free radicals became restricted to the low-oxygen environments that remained. d. oxygen was toxic to many species and some cells and forms of life became extinct. e. photosynthesis was no longer a common form of energy production.

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Steroids

a. have no fatty-acid component. b. consist of four rings. c. may have different numbers, types, and positions of functional groups attached to them. d. are a specialized type of lipid. e. are all of these.

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In which growth phase do bacteria produce antibiotics and endospores?

A) lag phase B) death phase C) acculturation phase D) stationary phase E) log phase

Biology & Microbiology