What is the main structural component of cell membranes?
a. Polypeptides
b. Triglycerides
c. Enzymes
d. Phospholipids
d
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All viruses must separate the nucleic acid from the capsid before replication
Indicate whether this statement is true or false.
What type of thinking is required?
What will be an ideal response?
Given the high degree of "order" living organisms demonstrate, the second law of thermodynamics can never be applied to life.
a. true b. false
When crossing over occurs, part of a chromatid on one chromosome breaks off and switches positions with the matching portion of a chromatid on the homologous chromosome. How does crossing over affect the possible genetic combinations in the offspring formed from these gametes?
A) Crossing over increases the number of possible genetic combinations in the offspring. B) Crossing over has no effect on the possible genetic combinations in the offspring formed. C) Crossing over affects only the possible genetic combinations that occur in identical twins. D) Crossing over decreases the number of possible genetic combinations in the offspring.