Briefly describe the makeup of VNTRs (variable number tandem repeats)
What will be an ideal response?
VNTRs are repeating DNA sequences of about 15-100 base pairs long that are found within and between genes. These sequences may be repeated to give regions 1000-5000 bp in length. They are dispersed throughout the genome.
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An organism has been isolated from decomposing organic matter. This organism has a cell wall but no chloroplasts. How would you classify this organism?
Which of the following best explains this phenomenon?
There is a population of frogs living in a pond, 25 are green, 25 are brown, 25 are yellow with green spots and 25 are all yellow. A drought occurred and 75% of the frogs died. The remaining frogs were green and brown, after 25 generations the frogs still were green and brown, yellow frogs never appeared in the population again. A. Sexual selection. B. Balancing selection. C. Bottleneck effect. D. Heterozygote advantage. E. Founder effect.
Modern eukaryotic cells appeared ____ billion years ago
a. 0.5
b. 1 c. 1.5 d. 2 e. 3.7
During diastole, __________.
a. the atria fill with blood b. blood flows passively into the ventricles c. the elastic recoil of the arteries maintains hydrostatic pressure on the blood d. the semilunar valves are closed, but the atrioventricular valves are open e. All of the listed responses are correct.