Which of the following is a requirement for natural selection?
a. variation in individuals
b. greater numbers of offspring from those that do not survive
c. a long period of time
d. low numbers of individuals
e. nonheritable traits
Ans: a. variation in individuals
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Antibiotics incorporated into the culture medium can
A. select against organisms that have not incorporated the plasmid. B. select against organisms that have incorporated a plasmid not containing the desired gene. C. select against organisms that have not incorporated the plasmid and select against organisms that have incorporated a plasmid not containing the desired gene D. enhance production of recombinant proteins.
Which is a correct statement about reptile reproduction compared to bird reproduction?
A. Birds are oviparous, reptiles are ovoviviparous. B. Both newly hatched birds and reptiles require parental care. C. Both exhibit external fertilization. D. The eggs of both birds and reptiles have protective shells. E. Male or female reptiles reproduce asexually; birds do not.
Explain how the discovery of cytoskeletal elements in prokaryotes contributed to the current understanding of the endosymbiont theory
What will be an ideal response?
Which statement is true about the relationship between viral infection and cancer?
a) Any virus type can cause cancer if it infects the "right" cell type b) Only people with compromised immune systems get cancer from viral infection c) About one fifth of all cancer types can be linked to viral infection d) Tumors that arise from viral infection never become malignant