Bacteria Are Widely Diverse in Their Cell Structure, Metabolism, and Ecological

question 37

Multiple Choice

Bacteria are widely diverse in their cell structure, metabolism, and ecological adaptations, but share some major common traits. Which of the following statements is NOT true?

• A) They share common features in central apparatus for gene expression and translation.
• B) Bacterial gene expression mechanisms differ from those of the eukaryotes, which underlines the selective activity of many antibiotics.
• C) Some archaeal cell walls are composed of pseudopeptidoglycan and thus may have different antibiotic sensitivity than bacteria.
• D) Mycoplasmas lack cell walls and are thus not susceptible to antibiotics.
• E) In bacteria, variant forms of peptidoglycan distinguish different species which thus may have different antibiotic sensitivity.

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Definitions:

Myofibrils

Long, filamentous organelles found in muscle cells that are crucial for muscle contraction and composed of sarcomeres.

Sarcomere

The basic contractile unit of muscle fiber, consisting of actin and myosin filaments between two Z lines.

Z Disk

Delicate, membranelike structure found at each end of a sarcomere to which actin myofilaments attach.

T Tubule

T Tubules, or transverse tubules, are extensions of the cell membrane that penetrate into the center of skeletal and cardiac muscle cells, playing a crucial role in muscle contraction.