Four of the five structures listed below belong to the
same system. Select the exception.
a. heart
b. spleen
c. thymus
d. tonsils
e. lymph node
Answer: a
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Which of the following pigments is found exclusively in red algae?
A) chlorophyll a B) chlorophyll c C) lutein D) phycoerythrin E) ?-carotene
The distinguishing animal trait "A," that separates the body forms of the eumetazoa and the parazoa is
A. whether the animal has bilateral symmetry and three germ layers, or radial symmetry and two germ layers. B. whether it is the mouth or the anus which forms first from the opening in the developing embryo. C. whether the animal must periodically molt in order to grow, or has characteristic soft larval stages. D. None of the answer choices is correct. E. whether or not the animal has true tissues.
Regulatory elements in gene control interact
with a. new polypeptide chains. b. DNA. c. RNA. d. final proteins. e. all of these.
The following pertain to ribosomes during protein synthesis except
A. ribosomes participate only in translation. B. they contain codons within their rRNA molecules. C. ribosomes use their large subunit to supply enzymes for peptide bonding. D. ribosomes shift toward the 3' end of the mRNA strand from one codon to the next. E. ribosomes bind to the 5' end of mRNA by their small subunit.