Which of the following tissues transports water and nutrients within the plant?
A. meristematic tissue
B. epidermal tissue
C. ground tissue
D. vascular tissue
Answer: D
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Which of the following would be considered a carbon reservoir? Select all that apply
A. the Atlantic Ocean B. Redwood National Park C. the Great Barrier Reef D. all the organisms on Earth
At locus a, the individual bearing these two homologous chromosomes is
a) homozygous for the dominant allele b) heterozygous for the dominant phenotype c) homozygous for the recessive allele d) heterozygous for the recessive allele e) homozygous for the dominant phenotype
The toxin that allows Rhizopus to cause the rice disease known as seedling blight is actually produced by ________ growing within the fungus.
A. Staphylococcus B. Clostridium C. Staphylococcus or Burkholderia, but not Clostridium D. Burkholderia E. None of the choices are correct.
For a science fair project, two students decided to repeat the Hershey and Chase experiment, with modifications. They decided to radioactively label the nitrogen of the DNA, rather than the phosphate. They reasoned that each nucleotide has only one phosphate and two to five nitrogen atoms. Thus, labeling the nitrogen atoms would provide a stronger signal than labeling the phosphates. Why won't this experiment work?
a) Although there are more nitrogens in a nucleotide, labeled phosphates actually have 16 extra neutrons; therefore, they are more radioactive b) Radioactive nitrogen has a half-life of 100,000 years, and the material would be too dangerous for too long c) Amino acids (and thus proteins) also have nitrogen atoms; thus, the radioactivity would not distinguish between DNA and proteins d) There is no radioactive isotope of nitrogen