Which of the following statements about muscle proteins is false?
A. Actin filaments have globular heads.
B. Thick filaments consist of parallel bundles
of myosin molecules.
C. Tropomyosin lies in a groove formed by
the actin helices.
D. Titin connects myosin filaments to the Z
disc.
E. Z discs are protein backbones that mark
the boundaries of sarcomeres.
A
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Which statement is not true about the resident microbiota of the respiratory tract?
A) Resident microbiota secrete antimicrobial peptides and compete with pathogens. B) Smoking affects the numbers and types of species in the microbiota. C) Microbiota are only found in the upper respiratory tract. D) The lungs have recently been found to contain a resident microbiome that resembles that found in the mouth. E) The resident microbiota of a healthy person is limited to just a few species of bacteria.
The function of fruit is to
A. attract pollinators. B. supply nutrients to the embryo. C. protect and help disperse seeds. D. protect flower buds.
One strand of DNA has the sequence 5? GGTCTA 3?. What is the sequence of the other strand?
A) 5? CCAGAT 3? B) 5? ATCTGG 3? C) 3? GGTCTA 5? D) 5? TAGACC 3?
Which of the following is not a function of muscle?
A) destabilize joints B) generate heat C) move blood in veins D) move lymph in lymphatic vessels