The most significant difference between archaea and bacteria is the:a

lack of a nuclear envelope in archaea.
b. absence of the 70S ribosomes in bacteria.


c. presence of a single filament flagellum in bacteria.
d. absence of peptidoglycans in the cell walls of archaea.
e. presence of fatty acids in the plasma membranes of archaea.


d

Biology & Microbiology

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Gene S controls the sharpness of spines in a type of cactus. Cactuses with the dominant allele, S, have sharp spines, whereas homozygous recessive ss cactuses have dull spines. At the same time, a second gene, N, determines whether or not cactuses have spines. Homozygous recessive nn cactuses have no spines at all. A cross between a true-breeding sharp-spined cactus and a spineless cactus would produce_____.

A) all sharp-spined progeny B) 50% sharp-spined, 50% dull-spined progeny C) 25% sharp-spined, 50% dull-spined, 25% spineless progeny D) all spineless progeny E) It is impossible to determine the phenotypes of the progeny.

Biology & Microbiology

Compliance problems are leading to a large increase in antibiotic resistant strains of

A. Streptococcus. B. Staphylococcus. C. Mycobacterium. D. Pseudomonas

Biology & Microbiology

Inflowing river waters most often impoverish rather than fertilize estuaries

Indicate whether the statement is true or false

Biology & Microbiology

A person you know has been in an automobile accident. The accident caused a dramatic personality change. Before the accident, he was industrious and well liked; after the accident, he is profane, impetuous, and incapable of working toward a goal

Which portion of the brain was most likely damaged? A) Hypothalamus B) Hippocampus C) Temporal lobe D) Frontal lobe E) Parietal lobe

Biology & Microbiology