Nondisjunction in humans can result in a person with
A. twenty-two pairs of autosomes, an X chromosome, and a Y chromosome.
B. twenty-two pairs of autosomes and two X chromosomes.
C. forty-seven chromosomes.
D. forty-six chromosomes.
C. forty-seven chromosomes.
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Three genes (X, Y, and Z) are in the same region of a bacterial chromosome. To determine the order of these genes, you infect X?Y?Z? cells with a lysate from wild-type cells infected with a generalized transducing phage. When X+ cells are selected, 70% of cells are also Y+ and 5% of cells are Z+. When Y+ cells are selected, 68% of cells are also X+ and 1% are Z+. What is the relative arrangement of the three genes?
A) Z is in the middle, but closer to X. B) Y is in the middle, but closer to Z. C) X is in the middle, but closer to Y. D) X is in the middle, but closer to Z.
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.
Consider an individual undergoing cancer chemotherapy, taking a drug that slows or stops cell division. Which one of the following is a likely side effect of such chemotherapy?
A) improved hair growth B) anemia C) weight gain D) headaches E) fluid retention
Fossil and genetic evidence strongly supports the idea that modern humans
A) independently arose from three different ancestral Homo species in Africa and Eurasia. B) all derive from a single African lineage that spread from there into other parts of the world starting about 50,000 years ago. C) derive from an African lineage but also have genes derived from mixing with several Eurasian descendants of Homo erectus. D) derive from Neanderthals that independently evolved the features of modern humans in Europe and Africa.