Helicobacter pylori is a principal causative agent of
A. gastroenteritis.
B. toxic shock syndrome.
C. human ehrlichiosis.
D. peptic ulcer disease.
Answer: D
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When DNA replication proceeds along a template, which of the following best describes the directionality of synthesis?
A. in the 3'-to-5' direction B. in both the 3'-to-5' and the 5'-to-3' directions C. in the 5'-to-3' direction D. from the centromere to the telomeres E. from telomere to telomere
If the sunflowers represent 2400 calories, how many calories would be lost as heat as you
move from the first to the second trophic level?
a. 240 b. 2160 c. 90 d. 10
Craig Venter and Claire Fraser are working to create a "minimal organism.". They are starting with Mycoplasma genitalium, a bacterium that has 517 genes. By disabling its genes one at a time, they discovered that 265–350 of them code for essential proteins. The scientists are synthesizing the essential genes and inserting them, one by one, into an engineered cell consisting only of a plasma
membrane and cytoplasm. They want to see how few genes it takes to build a new life form. What properties would such a cell have to exhibit for you to conclude that it was alive? What will be an ideal response?
Which of the following are sugar-transporting cells in angiosperms?
a) parenchyma cells b) tracheids and vessel elements c) sieve-tube elements d) collenchyma cells e) clerenchyma cells