When a membrane protein is radioactively labeled during synthesis and followed through the various organelles in the secretory pathway, all the radioactivity is concentrated in the cis-Golgi apparatus six hours after the protein synthesis
This suggests that the protein
A) was imported directly into the cis-Golgi posttranslationally.
B) contains a KDEL sequence near its C-terminus.
C) has a membrane-spanning domain length equals the thickness of the cis-Golgi membrane.
D) has a mannose-6-phosphate tag.
E) is misfolded and being degraded in the cis-Golgi.
Answer: C
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What is an area of the Earth's surface currently undergoing primary succession?
A. Orange groves in Florida B. Redwood forests along the northwestern U.S. coast C. Volcanoes in Iceland. D. Shallow seas with low productivity
Round is the dominant trait for a pea; the recessive allele produces a wrinkled pea. How can you
obtain true-breeding pea plants having round peas with the least amount of work?
a. Cross plants having round peas with plants having wrinkled peas. Select round pea plants from the progeny because they are now true-breeding. b. Cross plants having round peas with other plants having round peas. Do this for multiple generations. c. Cross plants having round peas with plants having wrinkled peas. Select round pea plants from the progeny and do a test cross to determine which parental plants were homozygous dominant. Use these homozygous pea plants as your true-breeding plants. d. Cross plants having round peas with plants having wrinkled peas. This will tell you which round pea plants are homozygous dominant and are thus true-breeding. e. It's not possible. You can only get true-breeding plants that have wrinkled peas.
Describe several ways that fruits can aid seed dispersal
What will be an ideal response?
In an allopolyploid organism, what is true regarding the fertility of interspecies hybrids?
A) Interspecies hybrids are fertile due to nonhomology of chromosomes. B) Chromosome doubling and nondisjunction in gametocytes can lead to homologous chromosome pairing, disjunction, and fertile hybrids. C) Interspecies hybrids will be fertile so long as there is an even number of chromosomes in the offspring. D) Mitotic nondisjunction results in haploid cells. E) Meiotic nondisjunction produces three haploid gametes and one diploid gamete.