Some complement proteins
A) induce antibody formation by phagocytic cells.
B) help trigger the inflammatory response.
C) are released by natural killer cells to attack cancer and virus-infected cells.
D) replace T cells in the cell-mediated response.
Answer: B
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Because carbon is able to form up to four covalent bonds, it can take on a variety of orientations, including linear, ________, and ________ structures.
Fill in the blank(s) with the appropriate word(s).
The reason that the various Hawaiian
honeycreepers are vulnerable to extinction is a. the reduction of their habitats. b. the warming of their habitats, supporting mosquitoes that carry the pathogens for avian malaria. c. the encroachment of humans into their habitats. d. the importation of new predators and competitors into their habitats. e. all of these answers
A scientist wants to perform a monohybrid cross for stem length in pea plants that will show all possible genotypes in the progeny. Which pea plants will they cross?
What will be an ideal response?
When a scientist examined museum specimens of a particular moth species, she noticed that the variation in color was distributed as shown in the first graph. She was surprised because her data from current collections indicated the distribution of colors
shown in the second graph. Which hypothesis about the cause of this shift in the range of genetic variation is the most likely to be supported by examination of the distribution of colors in a collection assembled at a time between that of the collection of the museum specimens and her current specimens?
A) Darker moths tend to lay more eggs than light moths.
B) Birds prefer to eat lighter moths rather than darker moths.
C) The bark of the tree on which moths landed became darker over time.
D) Darker moths were more likely to survive and have offspring over time.