In sporadic (nonhereditary) cancers, mutations occur in ________ cells
A) germ
B) somatic
C) undifferentiated
D) mammary
E) T
B
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How does a phage transfer DNA from one bacterium to another?
a. Phages form a bridge between bacterial cells that allows DNA to pass from the host cell to the recipient cell. b. Phages form a bridge between bacterial cells that allows DNA to pass in both directions between the two cells. c. Phages lyse bacterial cells, releasing bacterial DNA into the environment, which is taken up by other phages for transfer to new cells. d. When phages assemble in an infected bacterial cell, they may incorporate host DNA; released phages may attach to other cells and inject the bacterial DNA into those cells. e. Phages attach to receptors on bacterial cells and receive some of the target cells’ DNA; the phages release this DNA into the environment to be taken up by other bacterial cells.
Many species of field mice are able to reproduce several times a year and produce litters with multiple offspring. However, an ecologist noted that the population size of mice, as measured in a California grassland, did not change from year to year
The factors that keep natural populations from increasing are collectively called A) scramble competition. B) nonliving factors. C) exponential growth. D) biotic potential. E) environmental resistance.
A digger wasp continues to close its nest even though the researcher has removed the nest's contents. This shows that nest-closing behavior in the digger wasp is
Select one: a. a learned behavior. b. an imprinted behavior. c. a fixed action pattern. d. an insight learning behavior. e. a classical conditioned behavior.
What distinguishes a mitochondrion from a hydrogenosome?
a. absence / presence of hydrogen (respectively) b. generation of ATP through respiration / fermentation (respectively) c. sensitivity level to oxygen d. all of the above