Explain how an F' × F- conjugation can produce a partially diploid bacterial cell
What will be an ideal response?
The F' factor was derived from an integrated factor that acquired bacterial genes during excision from the chromosome by means of imprecise looping out and single crossover. During F' × F- conjugation, the F' factor is transferred to the F- cell. The recipient cell then contains two copies of the bacterial genes carried by the F' factor.
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The oceans contain about ________% of the Earth's water.
A. 95 B. 93 C. 91 D. 97
____________ occurs when a chemical signal secreted by the roots of one plant blocks the germination of nearby seeds or inhibits the growth of a neighboring plant.
A. Nodulation B. Etiolation C. Reduction D. Allelopathy E. The systemic response
a. integral proteins
a. hydrophobic b. hydrophilic c. both hydrophobic and hydrophilic d. neither hydrophobic nor hydrophilic
Why are severe burn patients at extreme risk of infection?
A) The skin is the first and primary barrier to preventing ingress of foreign substances. B) These patients have to stay in a hospital environment for a long time while being exposed to sick people. C) Most immune system cells are destroyed when the skin is damaged. D) The skin helps with the production of vitamin E, a necessary disease-fighting vitamin.