When a sarcomere is at rest, the myosin
binding sites on actin are blocked by
a. calcium.
b. troponin.
c. tropomyosin.
d. the myosin heads.
e. ADP.
C
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A scientist studied peregrine falcons to determine why the numbers of birds was declining. She determined that
A. global warming (too much carbon dioxide) had increased the death rates in the newly hatched chicks. B. the genetic diversity of the falcons was too low to sustain their population level. C. the falcons had lost much of their habitat due to human developments. D. the falcon's habitat had been fragmented and the subsequent edge effect affected their ability to hunt for prey items. E. the levels of DDT in the environment were having a detrimental effect on eggs (causing the eggshells to be too thin) that were being laid by the female falcons.
Which of the following has a complex sort of sexual
reproduction called conjugation? a. ciliates b. Plasmodium c. trypanosomes d. slime molds e. euglenoids
Respond to statements 104–108 in reference to the four source
tissues of plant roots listed below. a. primary meristems b. primary tissues c. pericycle d. vascular cambium M 104. This tissue gives rise to epidermis and cortex. D 105. This tissue gives rise to protoderm and procambium. D 106. This tissue gives rise to ground meristem. M 107. This tissue gives rise to cork cambium. D 108. This tissue gives rise to secondary phloem and xylem.
Which of the following gas that can sterilize?
peracetic acid chlorine phenol ethylene oxide