Pre-mRNA is modified on its 5' end by ____
a. exon shuffling
b. the addition of a poly(A) tail
c. mRNA splicing
d. the addition of a guanine cap
e. aminoacylation
ANSWER: d
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Which of the following hormones would be most useful in promoting the rooting of plant cuttings?
A) strigolactones B) abscisic acid C) cytokinins D) gibberellins E) indoleacetic acid
Which of the following was observed by Erwin Chargaff?
A. Base composition of DNA does not vary from one species to another. B. The DNA isolated from different tissues of the same species all have the same base composition. C. Base composition changes as the organism ages. D. In all species, the number of adenines equals the number of guanines. E. In all species, A + T = G + C.
In Figure 43-3, the vestibular canal is labeled:a
1
b. 2
c. 3
d. 7
e. 8
Bacteria typically have _______, whereas eukaryotes have _______.
a. one chromosome that is circular; many chromosomes that are linear b. several chromosomes that are circular; many chromosomes that are linear c. one chromosome that is linear; many chromosomes that are circular d. two chromosomes that are circular; eight chromosomes that are linear e. None of the above