The total number of viable microorganisms remains constant in stationary phase because ________.
A. there is a cessation of cell division even though the cells may remain metabolically active
B. there is a balance between cell division and cell death
C. either there is a balance between cell division and cell death or there is a cessation of cell division even though the cells may remain metabolically active
D. None of the choices are correct.
Answer: C
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How do prokaryotes alter their genetic makeup through conjugation?
a. by moving DNA with a pilus b. by incorporating surrounding DNA into the genome c. by moving DNA with a bacteriophage d. by using microbial metabolism to accept new DNA
The comparative anatomist Georges Cuvier confirmed the concept of extinction in 1812 when he demonstrated that there were no extant species anatomically related to the fossilized remains of the ________
A) mastodon B) Irish elk C) pygmy armadillo D) giant vampire bat E) Arctic lemming
In experiments with laboratory populations of Drosophila melanogaster, Mukai and Burdick (1959 ) observed that a lethal allele maintained a higher than expected frequency
The explanation for this observation is that, at equilibrium, the selective advantage of the lethal allele when it occurs in heterozygotes balances the disadvantage of the allele in homozygotes, and is termed ________. A) equilibrium distribution B) underdominance C) allelic frequency dependence D) overdominance E) terminal dominance
Be able to identify an example of stabilizing selection.
What will be an ideal response?