You are confronted with a box of preserved grasshoppers of various species that are new to science and have not been described. Your assignment is to separate them into species. There is no accompanying information as to where or when they were collected. Which species concept will you have to use?
A) biological
B) phylogenetic
C) ecological
D) morphological
D
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In transformation experiments using a variety of Bacteria, it has been noted that essentially all of the cells in a population can become competent
Indicate whether the statement is true or false.
A small molecule of RNA is transcribed in the nucleus. It is folded, cleaved by dicer protein, and then
binds to a target molecule of mRNA. This molecule of RNA must be
a. miRNA. b. siRNA. c. an mRNA that was not properly capped. d. an mRNA that never received its poly-A tail. e. a transcript for a masking protein.
Hormones are a class of signaling molecule carried by the ___________________ to target cells. Fill in the blank(s) with the appropriate word(s)
Individuals with the genetic condition sickle cell anemia have hemoglobin coded with the gene that codes for valine instead of glutamic acid. What kind of mutation does this condition result from?
a. a frameshift mutation b. a missense mutation c. a chromosomal mutation d. a silent mutation