When an organism moves from sun to shade, it reduces heating by conduction.
a. true
b. false
Answer: a. true
When you move into the shade, you are standing on much cooler ground, because that ground is in the shade. So not only are you gaining less radiation, you're also gaining less heat by conduction.
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In 1979, a group at Cambridge discovered that in human mitochondria, UGA is not a stop codon but instead during translation results in the delivery of the amino acid tryptophan
It was extremely unexpected to discover that one organism could have two different genetic codes, and that the genetic code was not universal—it is mostly or nearly universal. The evolutionary history of the genetic code is an area of robust debate. Which of the following statements about the evolution of the genetic code is most likely true? A. There is no chemical correspondence between codons and amino acids—the code is arbitrary in its origin. B. The presence of genetic code alternatives directly challengesthe concept of a common ancestor for humansand E.coli. C. Life arose twice as independent events. D. The genetic code has a small number of alternative states but these differences cannot be used like nucleotide differences in the genome to infer phylogenies (relationships).
Draw the relationship between the four main types of plants, bryophytes, seedless vascular plants, gymnosperms, and angiosperms. Make sure to include the main adaptations that occurred at each transition.
What will be an ideal response?
DNA wrapped twice around a protein core forms a ____
a. chromosome b. gene c. chromatin d. nucleosome e. chromatid
A particular virus consists of only DNA and proteins. Viruses attach to the surface of a host cell and inject the viral DNA into the host. The host cell then copies the viral DNA and makes new viruses
Eventually, the host cell is killed, and the new viruses are released. These new viruses search for new hosts to continue the cycle. Identify and apply at least three characteristics of life to justify whether a virus is a living thing.