The Retinoblastoma (Rb) protein blocks cells from entering the cell cycle by ______
(a) phosphorylating Cdk.
(b) marking cyclins for destruction by proteolysis.
(c) inhibiting cyclin transcription.
(d) activating apoptosis.
(c)
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Although sexual reproduction has a higher metabolic cost than asexual reproduction, many organisms use it. Why is it adaptive?
What will be an ideal response?
The lining of the gut and the stomach, liver, and
pancreas are produced by a. the ectoderm. b. the endoderm. c. the mesoderm. d. two of the germ layers. e. all of the germ layers.
A book is being publicized that purports to provide proof that aliens from another planet brought life to Earth. The proof they show are strange fossils of multicellular organisms that look like no animal you have ever seen
What group actually includes these "aliens"? A) organisms with adaptive radiation B) the Ediacaran fauna C) ancient archaea D) endosymbiotic organisms
Which of the following pairs of protists and their characteristics is mismatched?
A) apicomplexans — internal parasites B) euglenozoans — unicellular flagellates C) ciliates — red tide organisms D) entamoebas — ingestive heterotrophs