Nondisjunction in humans can result in
A. 22 pairs of autosomes, an X chromosome and a Y chromosome.
B. 22 pairs of autosomes, and two X chromosomes.
C. 47 chromosomes.
D. 46 chromosomes.
C. 47 chromosomes.
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Kinases are enzymes that can phosphorylate (transfer phosphate groups onto) macromolecules such as proteins. A particular kinase, Kinase 1 is known to promote cell division. It promotes cell division by phosphorylating Protein X. Phosphorylation of Protein X activates Protein X. Once activated, Protein X stimulates the production of other proteins such as Protein Y and Z that directly promote cell division. In order to function, Kinase 1 requires the presence of Metal A. However, in the presence of Protein A, Kinase 1 is nonfunctional. From the description, what is considered a cofactor of Kinase 1?
A. Protein X B. Protein Y C. Protein Z D. Metal A E. Protein A
Which of the following species concepts might differentiate species on the basis of descent from a common ancestor?
A. Ring species B. Ecological species C. Evolutionary species
If a male cat with orange fur produces female offspring with calico fur, what color was the mother cat?
A. orange B. black C. calico D. black or calico E. orange or calico
In the 2009 article "Genomic Footprints of a Cryptic Plastic Endosymbiosis in Diatoms" (Science 324: 1724-26), Moustafa et al. described their search for possible gene transfer from organelles to the nucleus in diatom genomes
They assumed that diatomic plastids came from red algae. However, they found that most were from green algae. Which is most likely? A) Diatoms once had green algal endosymbionts. B) Red algae had green algal endosymbionts. C) Red plastids were replaced by green plastids. D) Cyanobacteria imported green plastid genes. E) All red algal genes mutated to green algal genes.