Which of the following statements best explains why there are fewer colonies on plate IV than on plate III?
(A) Plate IV is the positive control.
(B) Not all E. coli cells are successfully transformed.
(C) The bacteria on plate III did not mutate.
(D) The plasmid inhibits E. coli growth.
Answer: (B) Not all E. coli cells are successfully transformed.
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During an acrosome reaction, the acrosome:a
detaches, allowing the sperm to penetrate the egg. b. releases enzymes that digest the outer layer of the egg. c. secretes calcium ions, which cause the sperm to fuse with the egg. d. releases bindin, which causes the sperm to bind to the egg. e. secretes a chemical that attracts the egg to the sperm.
Which statement represents the biological characteristics that kittens, oak trees, swans, earth worms, elephants and crickets have in common?
A. RNA nucleotides form the basis of all inherited life, with cells that are formed from other cells. B. DNA nucleotides form the basis of inherited life, with cells that are formed spontaneously from the environment. C. RNA nucleotides form the basis of inherited life, with cells that are formed spontaneously from the environment. D. DNA nucleotides form the basis of all inherited life, with cells that are formed from other cells.
Indicate the scenario(s) that could directly result in sympatric speciation. Check all that apply.A) Two sunflower species cross to form a healthy hybrid individual with equal copies of chromosomes from each parental species.B) A new river channel divides a population of beetles into two populations.C) A large fence blocks the intermingling of two populations of a species.D) A subset of flies within a larger population colonizes a new host plant.
What will be an ideal response?
Epidemic curves were prepared by plotting number of cases of disease on the Y-axis and dates on the X-axis. Graph would show a single prominent spike, restricted to a few days.
A. Propagated Epidemic B. Point-source Epidemic C. Common-source Epidemic