You have identified an enzyme that appears to be involved in the addition of palmityl group (a fatty acid) to certain proteins. Knowing that palmitoylated proteins are usually targeted for delivery to the plasma membrane, in which organelles might this enzyme be expressed?
A. Endoplasmic reticulum and ribosomes
B. Golgi apparatus and endoplasmic reticulum
C. Endoplasmic reticulum and nucleus
D. Golgi apparatus and nucleus
Answer: B
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Rocky Mountain juniper (Juniperus scopulorum) and one-seeded juniper (J. monosperma) have overlapping ranges. Pollen grains (which contain sperm cells) from one species are unable to germinate and make pollen tubes on female ovules (which contain egg cells) of the other species. These two juniper species are kept separate by _____.
A) habitat isolation B) temporal isolation C) gametic isolation D) behavioral isolation E) isolation
If a scientist recorded the size, birth rate, and age structure of an owl population over the last 20 years, he is most likely a(n):
A. demographist. B. embryologist. C. botanist. D. mathematician. E. evolutionary biologist.
How would you expect a disease of cartilage formation to affect bone development?
A. Cartilage is used for other tissues, not bone, so it will not affect bone development. B. The epiphysis is formed of cartilage so that will be disrupted, but otherwise the bone will be normal. C. It would greatly disrupt bone development, since bones are originally formed of cartilage that becomes replaced. D. Cartilage defects will affect bone only via the effect on tendons and ligaments.
The use of lysozyme during the preparation of cheeses and wines is effective in reducing the numbers of
A. fungi. B. viruses. C. bacteria. D. prions. E. all microbes.