The Reznick and Endler guppy study showed
that killifish and pike-cichlids raised in natural
conditions will
a. affect the age at first reproduction of the
guppies that live with them.
b. prey on guppies.
c. affect the growth rate of guppies.
d. affect the evolution of the guppies' life
history traits.
e. do all of these
E
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Examine the figure and statements below. Which one of the statements is incorrect?
A. mRNA for caudal and hunchback are evenly distributed in the oocyte, but bicoid and nanos mRNA are located either anteriorly or posteriorly, respectively. B. Bicoid protein promotes the transcription of the hunchback gene in the anterior region of the embryo. C. Nanos protein represses the translation of hunchback mRNA in the posterior region of the embryo. D. Bicoid protein represses the translation of caudal mRNA in the anterior region of the embryo. E. The expression pattern of Caudal and Hunchback proteins is an example of gene regulation at the level of translation.
The letter “C” in the figure above represents
a. root apical meristem. b. dermal tissue. c. vascular tissue. d. ground tissues. e. ground, dermal, and vascular tissues.
Which type of tissue forms an electrical communication system within the body?
A) nervous B) blood C) connective D) muscle
Gel electrophoresis sorts DNA molecules on the basis of their
A) nucleotide sequence. B) ability to bind to mRNA. C) solubility in the gel. D) size.