Why might mitochondrial DNA be used in construction of phylogenetic trees rather than nuclear DNA?
What will be an ideal response?
Mitochondrial DNA evolves relatively quickly, so that if a "fast clock" is needed to estimate relatively short evolutionary time periods, mitochondrial DNA can be especially useful. Also, it is not subject to recombination, so the separate mitochondrial genetic lineages remain distinct with little mixing.
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The crescent-shaped structure of PUF proteins reveals two extended surfaces. Based on the location and effects ofmutations, one surface probably binds to regulatory proteins and the other surface probably binds to:
A. ribosomal proteins increasing the association of ribosomes to the 5' end of the ribosome tRNA binding site. B. specific sequences in the 3' UTR of mRNA. C. the nuclearAAUAAA polyadenylation sequence. D. the peptidyl (P) site on the 40Sribosomal subunit.
Mesoderm gives rise to
A. epidermis. B. digestive tract. C. respiratory tube. D. peripheral nervous system. E. skeletal muscle.
Sponges and worms belong to the domain ________
Fill in the blank(s) with correct word
In the human circulatory system, blood flows through the following structures in which order? (1) vena cava, (2) left ventricle, (3) pulmonary vein, (4) right atrium, (5) aorta, (6) pulmonary capillaries
a. 1 - 4 - 6 - 3 - 2 - 5 b. 1 - 5 - 3 - 6 - 2 - 4 c. 1 - 2 - 6 - 3 - 4 - 5 d. 1 - 4 - 3 - 6 - 2 - 5 e. 1 - 2 - 3 - 6 - 4 - 5