Which structure is found in every cell?
a. Chloroplast
b. Cell wall
c. Nucleus
d. Plasma membrane
e. Central vacuole
d
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In the accompanying figure, a cell type that helps to pull water through the sponge and strains out food particles is
identified by the number ____. a. 1 b. 2
c. 3 d. 4 e. 5
Auxin is made mainly in ____ and in young leaves, and transported elsewhere
a. chloroplasts b. lateral buds c. lateral meristems d. root apical meristems e. shoot apical meristems
In eukaryotes, the 3? end of the mRNA is important in the initiation of translation because
A) it contains Kozak sequences that aid in initiation. B) translation occurs in the 3? to 5? direction. C) eIF4A is attached to the 3? end and removes any secondary structure that might prevent translation. D) the 3? poly(A) tail and PABP bind initiation factor eIF4G, stabilizing the 5? end of the mRNA. E) it contains Kozak sequences that aid in initiation of translation in the 3? to 5? direction.
A mutation in the IGF2 gene in pigs results in a three-fold increase in the transcriptional activity of this gene in muscle
cells; therefore, these pigs are leaner and more muscular. Because this mutation is located in the noncoding region of the IGF2 gene, we can infer that:a. the IGF2 gene is a prokaryotic gene. b. the IGF2 gene is present only in muscle cells, but not in adipose (fat) cells. c. the mutation changes the amino acid sequence of the IGF2 protein. d. the mutation alters the regulatory region of the IGF2 gene. e. less IGF2 protein is synthesized in the muscle cells of these pig