The thick filaments of a sarcomere are composed of ____, and the thin filaments are composed of ____
a. actin; myosin
b. myosin; actin
c. myofibrils; actin
d. A lines; Z lines
e. myofibrils; myosin
ANSWER: b
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If two or more of the genes are linked, what map distance separates them?
In peas, tall (T) is dominant to short (t), red flowers (R) is dominant to white flowers (r), and wide leaves (W) is dominant to narrow leaves (w). A tall plant that has red flowers and wide leaves is crossed to a short plant that has white flowers and narrow leaves. The resulting progeny are shown in the table.
A) 4 m.u.
B) 12 m.u.
C) 24 m.u.
D) 50 m.u.
E) None of the genes are linked to each other.
In green plants, which photosystem absorbs photons to excite electrons in the reaction center?
A. photosystem I B. photosystems I, II and III C. photosystems I and II D. photosystem III E. photosystem II
Which of the following is a sign of disease?
A) headache B) dizziness C) fever D) nausea E) cramps
Choose the answer that best fits the following statement: Cholesterol is an essential component of biological membranes
Although it is much smaller than the typical phospholipids and glycolipids in the membrane, it is a(n) _________________ molecule, having both hydrophilic and hydrophobic regions. (a) polar (b) oxygen-containing (c) hydrophobic (d) amphipathic