Assuming the plant survives, predict what would occur if you removed the shoot apical meristem of a plant embryo.
A. Growth would only occur at in the roots.
B. The plant would grow two or more new shoot apical meristems.
C. The root apical meristem would take over the function of the shoot apical meristem.
D. The plant would mature, but only through vertical growth--no branches would form.
A. Growth would only occur at in the roots.
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Viruses contain DNA or RNA, but lack genes necessary for metabolism and reproduction. Why are viruses not considered to be alive?
A. Viruses are unable to reproduce independently of a host. B. Viruses do not have the ability to evolve in their environment. C. Viruses do not contain internal organelles. D. Viruses do not contain nucleic acids.
You uncovered a fossil that you suspect is around 100 million years old. Which of the radioisotope pairs in the table below could you eliminate as an appropriate choice for radioisotope dating the accompanying rock?
A. Potassium-40/Argon-40 (half-life = 1.3 billion years; useful dating range =100,000-4.5 billion years).
B. Rubidium-87/Strontium-87 (half-life = 47 billion years; useful dating range = 10 million-4.5 billion years).
C. Uranium-235/Lead-207 (half-life = 710 million years; useful dating range = 10 million-4.5 billion years).
D. Carbon-14/Nitrogen-14 (half-life = 5,730 years; useful dating range = 100-50,000 years).
E. Uranium-238/Lead-206 (half-life 4.5 billion years; useful dating range = 10 million-4.5 billion years).
The lymphatic system is comprised of lymph nodes and ducts, the spleen, thymus, bone marrow and white blood cells,
all of which are central players in defending the body against microorganisms and viruses.
Indicate whether the statement is true or false.During meiosis I, homologous chromosomes undergo ______, and crossing-over between nonsister chromatids occurs.
Fill in the blank(s) with the appropriate word(s).