The dark gray dots along the trunk of this evolutionary tree represent both common ancestors and:
a) homologous features.
b) speciation events.
c) convergent traits.
d) nodes.
e) Both b) and d) are correct.
Ans: e) Both b) and d) are correct.
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What is the endomembrane system?
A. A group of internal membranes and organelles that are highly connected within a eukaryotic cell B. Another name for the Golgi apparatus C. Another name for the endoplasmic reticulum D. A group of vesicles that are highly connected within a eukaryotic cells
Why is insulin produced by genetically engineered E. coli cells superior to insulin obtained from
animal sources? a. Animal insulin has a shorter life span than insulin produced using recombinant DNA techniques. b. It contains human rather than animal sequences, reducing the chances of an allergic response. c. Animal insulin is more difficult to purify than is recombinantly produced insulin. d. Recombinantly produced insulin has a much higher activity level. e. Recombinantly produced insulin is easier to obtain than insulin from animals.
Organisms that depend on the energy stored in chemical bonds by other organisms for their food energy are called ________.
A. Chemotrophs B. Autotrophs C. Oligotrophs D. Heterotrophs
The tails of some bacteriophage ________.
A. rotate like flagella to drive the phage genome into the cytoplasm of the host B. include a tail sheath that shortens C. exhibit oar-like motion that drives the phage genome into the cytoplasm of the host D. None of the choices are correct.