Explain the function of each of the following structures in regards to muscle contraction: actin filaments, Ca+ ions, myosin filaments and ATP.
What will be an ideal response?
Actin filaments - slide past the myosin causing the contraction.
Ca+ ions - are needed for the myosin to bind to the actin.
Myosin filaments - pull actin filaments by means of crossbridges, also split ATP
ATP - supply the energy for the muscle contraction
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Which two groups of primates share the closest relatedness?
a. Chimpanzee and hominids b. Lemurs and Old World monkeys c. Tarsiers and orangutans d. Orangutans and Old World monkeys e. Gibbons and hominids
The letter “B” from the above figure represents
a. ectoderm. b. endoderm. c. mesoderm. d. neural plate. e. all of these.
Hereditary material in organisms is
a. DNA b. ATP c. RNA d. chromosomes
What is the main difference between plant defense mechanisms that use secondary chemical metabolites versus plant defense mechanisms that use a systemic response?
A. The metabolites can only help in defense against insects, not against other plants. B. The metabolites are toxic to the plants that produce them, the systemic response is safer. C. The metabolites are not as lethal as the systemic response. D. The metabolites are present at all times, and the systemic response must be induced. E. The metabolites are a more reliable way to kill the invader.