B cells are genetically programmed to produce unique antibodies; similarly, T cells are genetically programmed to produce unique T-cell receptors
a. True
b. False
Indicate whether the statement is true or false
True
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A species of insect that lives solely on pine sap was found to contain a bacterial symbiont
Genome sequencing of both the host and the symbiont revealed that the symbiont lacked many genes required for energy production, and the host lacked genes for biosynthesis of several essential amino acids. What is/are the most likely mechanism(s) that caused the loss of these genes? A) coevolution B) horizontal gene transfer C) increased mutation rate D) horizontal gene transfer and increased mutation rate
Which of the following is associated with mollusks?
a. mantle b. pedicle c. spicule d. pistil
Describe the structure of DNA.
What will be an ideal response?
Darwin's exposure to Lyell gave him insight on the ____.
A. existing evidence from fossils B. record of catastrophic changes that encouraged evolution C. soundness of Lamarck’s theories D. enormous lengths of time required for geologic events E. arguments for creationism