Plastids originated from which of the following groups of prokaryotes?
A. Cyanobacteria
B. Archaea
C. Proteobacteria
D. Actinobacteria
E. Spirochaetes
Answer: A
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Osteocytes are bone cells. Collagen fibers and calcium salts are found in abundance between and among the osteocytes. The collagen and calcium salts are _____
A) components of the plasma membrane of osteocytes B) part of the extracellular matrix C) extensions of the endoplasmic reticulum D) deposited by the circulatory system but not associated with the osteocytes
In most living cells, which one of the following is not a product of cellular respiration?
A. carbon dioxide B. water C. oxygen D. ATP E. All of these choices are products of cellular respiration in most living cells.
Which of the following is NOT a stage in transcription?
A) elongation B) termination C) translocation D) Initiation
Acne is caused by problems with the:
A) sebaceous glands. B) endocrine glands. C) hair follicles. D) sweat glands.