Four of the five answers listed below are related by a common number. Select the exception
a. number of nucleotides in a codon
b. number of building blocks (parts) in a nucleotide
c. number of stop codons
d. number of types of DNA
e. number of types of RNA
D
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The strongest evidence that a meteor impact is responsible for dinosaurs becoming extinct is provided by:
A. the detection of high levels of radioactivity in the fossilized remains of dinosaurs from the time period corresponding to extinction B. the presence of significant levels of iridium in the rock layers corresponding to the time of dinosaur extinction C. contamination of fossils from that time period with fragments of rock that penetrated the skeletons of many dinosaurs D. high levels of particulate matter in the lungs of dinosaur specimens perfectly preserved in ice E. none of the above; no evidence supports a meteor impact being responsible for the extinction of the dinosaurs
Explain how the heart of a double-pithed frog can continue to contract in an organized manner after the nervous system is destroyed.
What will be an ideal response?
Which of the following is NOT an adaptation of mosses for living on land?
A. delayed meiosis B. enclosure of gametes in gametangia C. enclosure of zygotes in the gametophyte D. wind dispersal of gametes E. wind dispersal of spores
The pages of your textbook consist mainly of material made by multicellular, photosynthetic
organisms that function as producers in ecosystems. These organisms belong to the kingdom ____.
a. Plantae b. Fungi c. Animalia d. “Protist” e. Bacteria