DNA is different from RNA in that
A) RNA contains an additional oxygen atom on the ribose sugar.
B) RNA is made up five bases, whereas DNA is made up of four.
C) RNA cannot exist as a double helix.
D) in general, RNA molecules are longer than DNA molecules.
E) all of the above
A) RNA contains an additional oxygen atom on the ribose sugar.
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Why doesn't a flatworm have a circulatory system?
a. The animal is thin enough to permit effective gas exchange by diffusion. b. There is not enough room for a circulatory system because of the large gastrovascular cavity. c. The animal lacks muscles, so it could not have a heart to pump blood. d. Only bilaterally symmetrical animals need a circulatory system. e. Only vertebrates have circulatory systems.
If the first primitive cells on Earth were heterotrophs, they must have
A. received organic molecules from autotrophs. B. had DNA as their genetic material. C. manufactured their own organic matter. D. None of these answers is correct.
Which of the following can be measured to estimate an organism's evolutionary fitness?
A) The number of offspring it produces over its lifetime that survive to breed B) The number of gametes it produces over its lifetime C) The size of its offspring D) The number of eggs it produces over its lifetime E) The number of offspring it produces over its lifetime
Answer the following questions true (T) or false (F)
1. Endemic fungal infections are most likely to occur in immunocompromised patients while ubiquitous fungal infections are routinely found in otherwise healthy individuals. 2. The numbers and types of microbes found in the normal skin microbiota are consistent across all body surfaces. 3. As measles vaccination rates have declined in recent years due to concerns about the vaccine, there have been no documented outbreaks of the disease, showing that the measles virus has been successfully eliminated from the population.