Skeletal muscle produces force as the ________ "walk" along the ________
A) myosin heads; actin B) actin heads; myosin
C) creatine phosphate molecules; sarcomere D) ATP molecules; myofibrils
A
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Which of the following is related to type I survivorship?
a. large parental investment in the offspring b. high death rate with young individuals and low death rate with older individuals c. r-selection d. constant death rates through different age intervals
Which of the following is not a characteristic of epithelial tissue?
A. The layers consist of loosely packed cells. B. It lines the covering of hollow organs. C. It lines the covering of the inside of hollow organs. D. It anchors to other tissue by an extracellular matrix. E. Adjacent cells in the tissue are connected by tight junctions.
What happened when researchers added BPDE, a component of tobacco smoke, to human lung cells in a laboratory experiment?
A) The cells behaved normally. B) The cells shrank in size. C) The cells developed mutations in their p53 genes. D) The cells required less energy to grow.
Which of the following is true about histone acetyltransferase (HAT)?
A) HATs will make the chromatin more compacted and less available to transcription regulatory proteins. B) HATs will remove acetyl groups from histone proteins. C) HATs have an overall effect of increasing the positive charges on DNA. D) HATs will add acetyl groups to DNA. E) HATs are usually linked to increasing gene expression.