What is a 15-meter tall tree fern?

A. A gametophyte
B. A sporophyte
C. Haploid
D. Produced by meiosis


Answer: B

Biology & Microbiology

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An organism at the top of the food chain:

A. has no natural prey B. has no, or very few, natural predators C. experiences no selection pressures D. is not subject to evolutionary changes

Biology & Microbiology

Your phagocytes produce transmembrane proteins called toll-like receptors (TLR), but your mast cells do not because _____________

A. your phagocytes carry the genetic information to make TLRs but your mast cells do not. B. your phagocytes run transcription and translation but your mast cells only run transcription. C. some of your body's cells contain ribosomes but most do not. D. your phagocytes express some genes that are not expressed in your mast cells (and visa versa).

Biology & Microbiology

Choose the true statements about orthologs and paralogs.  

_____  Orthologs are likely to have the same function. _____  Both orthologs and paralogs result from gene duplication. _____  The sequence of an ortholog is more likely to be conserved than the sequence of a paraloge. _____  Paralogs are more likely to be pseudogenes than are orthologs. _____  Paralogs often evolve new functions.

Biology & Microbiology

As a pond starts to dry out at the end of the rainy spring season, a researcher notices that toads

burrow into the soil where they can hibernate for up to nine months. What is the benefit of hibernation?

a. reduced metabolic rate that ensures survival b. increased body temperature that ensures survival c. a period of time during which the animal completes sexual maturity d. all of these

Biology & Microbiology