How many molecules of glycerol (; molecular mass = 92) would be present in 1 L of a 1 M glycerol solution?
a) 92 × 6.02 × 10^23
b) 14 × 6.02 × 10^23
c) 1 × 10^6
d) 6.02 × 10^23
e) 6.02 × 10^26
Ans: d) 6.02 × 10^23
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Although especially useful to the giraffe, the rete mirabile is similar to a countercurrent heat exchange system in other related, less evolved, mammals. Thus a mechanism for _________________ homeostasis is likely to have evolved from a mechanism previously used for __________________ homeostasis.
A. blood pressure; pH B. temperature; blood pressure C. blood pressure; temperature D. pH; blood pressure Adult giraffes can be up to 20 ft. tall, and thus require special adaptations to maintain appropriate blood pressure. One adaptation is the rete mirabile, a group of blood vessels that form a web or net-like structure to slow blood flow.
Which of the following is not a reason to explain why fewer animals live in freshwater than in the
ocean? a. Freshwater is generally hypotonic to tissue fluids. b. Freshwater generally has a less constant temperature environment. c. Freshwater generally has a less constant oxygen environment. d. Freshwater generally is more turbid. e. Freshwater generally contains less food.
In trying to determine whether DNA or protein is the genetic material, Hershey and Chase made use of which of the following facts?
A) DNA contains sulfur, whereas protein does not. B) DNA contains phosphorus, whereas protein does not. C) DNA contains nitrogen, whereas protein does not. D) DNA contains purines, whereas protein includes pyrimidines.
Based on the theory of evolution, why should you always finish your bottle of antibiotics?
A) Because the pills are expensive and you should not waste them. B) Because if you don't take all the pills, the bacteria will gain strength and be able to resist future attacks with antibiotics. C) Bacteria vary in their ability to be killed by antibiotics. If you only take some of pills, the bacteria will know that they need to evolve to be stronger for the infection. D) Individual bacteria vary in their ability to be killed by antibiotics. If you don't finish all your pills, you are selecting for the most resistant bacteria.