The first cells were probably ________ cells.
Fill in the blank(s) with the appropriate word(s).
prokaryotic
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In which of the following environments would you expect to find a high number of iron-reducing bacteria?
A) acidic mine drainage B) deep subsurface C) open ocean D) agriculture soil
A colony of mice is treated with a noninfective form of the bacterium Streptococcus pneumoniae. A
new researcher exposes this noninfective form to heat-killed cells of an infective strain. What would be the effect of this action in the mouse population?
a. The mice will all remain healthy. b. Some mice will die, but most will live. c. The mice will get sick with pneumonia. d. Some will get sick with pneumonia, but most will live. e. The mice will become immune to the bacterium.
Which of the following was proposed by Mendel after working with garden pea plants?
a. The physical observation of a recessive trait means that the organism lacks any dominant versions of that characteristic. b. An organism’s dominant traits disappear in the offspring of a hybridization. c. The physical observation of a dominant trait means that the organism has two recessive versions of that characteristic. d. An organism’s dominant and recessive traits blend to form a codominant allele.
Suppose that round is the dominant allele for a pea; the recessive allele produces a wrinkled pea. How can true-breeding pea plants having round peas be obtained with the least amount of work?
a. perform a testcross of the plants with wrinkled peas to determine which are true breeding b. perform a testcross on the plants with round peas to determine which are true breeding c. perform multiple crosses between plants with round peas until one emerges that seems true breeding d. perform multiple crosses betwe