Didinium are carnivorous protista, that prey on other, slower moving protista. A student is studying Didinium feeding rates after 1, 3, and 5 days of food deprivation. How should she classify the organism she is studying?
What will be an ideal response?
eukaryotic consumer
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Meselson and Weigle grew one strain of bacteriophage lambda with alleles A and B in heavy isotopes and another strain with alleles a and b in light isotopes. Both loci are located near the end of the viral chromosome. Which statement best describes their results and conclusions?
A) They visualized the broken chromosomes under a microscope and concluded that DNA was exchanged between light and heavy chromosomes during recombination. B) They found a gradient of all densities of recombinant chromosomes and concluded that DNA was not exchanged between light and heavy chromosomes during recombination. C) They found that some A b genetic recombinants were almost as dense as the A B parent chromosome and concluded that DNA was exchanged between light and heavy chromosomes during recombination. D) They found that some A b genetic recombinants were almost as dense as the A B parent chromosome and concluded that DNA was not exchanged between light and heavy chromosomes during recombination.
Growth of long bones
a. follows the cartilage model. b. occurs in the middle at first, then at both ends. c. is characterized by bone tissue replacing calcified cartilage. d. is characterized by the persistence of cartilage at both ends of the bone. e. includes all of these.
Aspirin helps prevent blood clots by ____
a. blocking the activation of thrombin b. reducing platelet aggregation c. reducing vessel spasm d. stimulating the conversion of fibrinogen to fibrin e. stimulating the activation of factor X
How would the hydrolysis of phosphodiester bonds impede the origin of life?
A. It would stop the formation of cell membranes. B. It would prevent the assembly of nucleic acids. C. It would digest amino acids. D. It would slow the rate of protein synthesis.