E. coli strains toxic to humans live in the
intestine of ____ without sickening them.
I. birds and frogs
II. goats and sheep
III. cattle and deer
a. I only
b. I and II
c. II and III
d. I and III
e. all of these
C
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Which of the following alternate forms of nucleic acids are not known to be biologically important?
A. G tetraplex structures can form and act as recognition sites for enzymes that cleave DNA. B. Inverted repeats can form hairpins that are important for slowing or preventing protein synthesis. C. Palindromic sequences can act as recognition sites for enzymes that cleave DNA. D. Sequence-induced bending of the DNA can act as a binding site for transcription factors. E. Cruciform structures are formed during recombination.
Of the following sequences, which shows the correct molecules through which electrons flow when delivered to the electron transport system by NADH?
A) complex I, cytochrome c, complex III, coenzyme Q, complex IV, oxygen B) complex I, coenzyme Q, complex III, complex IV, oxygen C) complex I, coenzyme Q, complex IV, cytochrome c, oxygen D) complex I, coenzyme Q, complex III, cytochrome c, complex IV, oxygen E) complex II, coenzyme Q, complex III, complex IV, oxygen
What is the key concept addressed by the question?
What will be an ideal response?
In 1986, a nuclear power accident in Chernobyl, USSR (now Ukraine), led to high radiation levels for miles surrounding the plant
The high levels of radiation caused elevated mutation rates in the surviving organisms, and evolutionary biologists have been studying rodent populations in the Chernobyl area ever since. Based on your understanding of evolutionary mechanisms, which of the following most likely occurred in the rodent populations following the accident? A) Mutations caused major changes in rodent physiology over time. B) Mutation led to increased genetic variation. C) Mutation caused genetic drift and decreased fitness. D) Mutation caused the fixation of new alleles.