Choose the phrase that best represents macroevolutionary change.

A. major episodes of extinction
B. new forms of animals replacing older ones
C. changes in allele frequency in a population
D. darker skin after hours spent in a tanning booth


Answer: B

Biology & Microbiology

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Answer the following statements true (T) or false (F)

1. G proteins and Ras are activated when bound to guanosine diphosphate. 2. One common feature with G-protein coupled, enzyme-linked, and growth factor receptors is that their activation leads to activation of protein kinases. 3. Cyclic AMP activates protein kinase C in producing a cell response. 4. If IP3 binds a Ca2+ ligand-gated ion channel in the endoplasmic reticulum then cytosolic Ca2+ levels will rise in the cell.

Biology & Microbiology

Alberto had a bad bump on his leg, so he went to see the doctor about it. The physician diagnosed it as a blood clot and said that blood clots can float away into the circulation. One of these floaters is called a(n) ________

A) prothrombin B) formed element C) platelet plug D) embolus

Biology & Microbiology

Which pair of terms most accurately describes life history traits for a stable population of wolves?

A) Semelparous; r-selected B) Semelparous; K-selected C) Iteroparous; r-selected D) Iteroparous; K-selected E) Iteroparous; N-selected

Biology & Microbiology

Bacterial electron transport chains may be comprised of fewer components and have lower phosphate to oxygen (P/O) ratios than mitochondrial transport chains.

Answer the following statement true (T) or false (F)

Biology & Microbiology