Which type of receptor detects low blood sugar levels, stimulating the organism to eat?
a. mechanoreceptors
b. photoreceptors
c. chemoreceptors
d. thermoreceptors
e. nociceptors
ANSWER: c
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In the Morse code, a series of dots and dashes code for letters of the alphabet. How is this analogous to the genetic code?
A) There is complementarity in the genetic code (A is complementary to T, and C is complementary to G). B) The bases that make up DNA are coded by the sugar-phosphate backbone. C) The machinery involved in DNA synthesis is analogous to the telegraph equipment used in sending Morse code. D) The bases of DNA code for the more complex amino acid sequence of the proteins in cells.
A special structure on certain cyanobacteria for nitrogen fixation is called a(n):
a. ammonia cyst. b. homocyst. c. heterocyst. d. nematocyst. e. pneumatocyst.
During secondary growth of a plant, ____ gives rise to wood and ____ gives rise to periderm
a. vascular cambium; cork cambium b. cork cambium; apical meristem c. cork cambium; vascular cambium d. lateral meristem; apical meristem e. vascular cambium; apical meristem
________ is a hydroxyl group
A) –NH2 B) –OH C) –COOH D) –H