Bios 224 Exam 1 - –Answer The hydrophobic portion of a protein ...

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Bios 224 Exam 1

• How can proteins be anchored in the cell membrane?

–Answer The hydrophobic portion of a protein molecule joins the lipid layer of a membrane.

• Which of the following features is shared by all life on Earth (but not necessarily

in all the universe)?Select one –Answer

• Oxygen dependent metabolism.
• Sun as energy source.
• Intracellular compartmentalization (organelles).
• Cell nucleus.
• Cellular growth.

–Answer Cellular growth.

• Which of the following sentences is true regarding the ecology on Earth? Select one

–Answer

• Energy flows, Nutrients cycle.
• Energy flows, Nutrients flow.
• Energy Cycles, Nutrients flow.
• Energy cycles, Nutrients cycle.

–Answer Energy flows, Nutrients cycle.

• What is the key difference of sexual reproduction from asexual reproduc- tion? Asexual

(= non-sexual) has no... 1 / 3

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Select one –Answer

• Recombination of genes.
• Replication of genes.
• Regeneration of genes.
• Repression of genes.
• Reproduction of genes.

–Answer Recombination of genes.

• Which of the following is true? Select one

–Answer

• Cytokinesis is followed by the G2 phase.
• After mitosis, all resulting nuclei or cells are clones.
• Mitosis is always followed by Cytokinesis.
• Mitosis is followed by the S phase.

–Answer After mitosis, all resulting nuclei or cells are clones.

• Genetics

–Answer What are alleles? Select one –Answer

• Two genes in a homozygous individual.
• Two corresponding phenotypes.
• Two or more states of a locus.
• Two homologous chromosomes.
• Two different loci.

–Answer Two or more states of a locus. 2 / 3

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• Which of the following Eras was the age of the dinosaurs?

Select one –Answer

• Mesozoic
• Devonian
• Pleistocene
• Carboniferous
• Silurian

–Answer Mesozoic

• Which of the following is NOT a mass extinction event? Select one

–Answer

• End of Triassic 190 mya.
• Yucatan-Chicxulup impact 65 mya.
• End of the Permian era, about 250 mya
• Transition Devonian to Carboniferous 360 mya.
• Cambrian Explosion, about 540 mya

–Answer Cambrian Explosion, about 540 mya

• How do we know about the conditions on early Earth at the beginning of life? [not in the

book] Select one –Answer

• From conditions in outer space and other planets.
• We do not know, just speculation.
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