The number of genes in the human genome is estimated to be between
A. 20,000 and 25,000.
B. 50,000 and 75,000.
C. 150,000 and 200,000.
D. 5,000 and 10,000.
E. 80,000 and 100,000.
A
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Teichoic acids are:
a. waxy substances that are found in some bacterial cell walls that make the cells re-sistant to toxic substances, including ac-ids. b. glycerol- or ribitol-phosphate polymers that are combined with various sugars, amino acids, and amino sugars, which are a part of the cell wall of gram-positive bacteria. c. high–molecular-weight polysaccharides that coat some bacterial cells and protect the bacteria from attack by cells of the human defense system. d. hairlike, proteinaceous structures that ex-tend from the cell.
At the bottom of an energy pyramid are the ____
a. primary producers b. secondary producers c. primary consumers d. secondary consumers e. tertiary consumers
The sex-determining chromosomes of a human male are the
A) Z and Z chromosomes. B) Y and Z chromosomes. C) X and Y chromosomes. D) Y and Y chromosomes. E) X and X chromosomes.
A newly described unicellular organism was isolated from a salt mine. This organism has no membranous organelles and its cell wall lacks peptidoglycan. Attempts to culture it in a medium with less than 25% salt were unsuccessful, but it was able to grow well on 25% salt supplemented agar. This organism would best be described as a ________ and is most likely in the domain ________.
A. halophile; Archaea. B. thermophile; Bacteria. C. halophile; Bacteria. D. thermophile; Archaea. E. thermophile; Eukarya.