Female silkworm moths produce a ____ signal referred to as bombykol, which generates a message in specialized
receptors on the antennae of any male silkworm moth that is downwind.
a. chemical
b. visual
c. electrical
d. acoustical
e. tactile
ANSWER: a
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The solar system formed ____ billion years ago
a. 4 b. 5 c. 6 d. 7 e. 8
Four of the five answers below are related as members of the same group. Select the exception
a. lactose b. maltose c. sucrose d. table sugar e. glucose
Which of the following statements is true?
a. Arteries carry only oxygenated blood. b. The systemic circuit leaves the heart from the left ventricle. c. Blood passes through only one capillary bed on its trip through the systemic circuit. d. Platelets survive a longer time than erythrocytes. e. The heart is able to pick up the oxygen it needs as the blood flows through it.
Which of the following represents normal fertilization in humans?
A. 2n + 2n = 4n B. n + 2n = 2n C. n + n = 2n D. 2n = n