Which of the following is a difference between the solenoid and zigzag models for the formation of the 30 nm filament?
A. Most of the evidence to date supports the solenoid model, while the zigzag model is unlikely to occur in cells.
B. Linker DNA is at the center of the filament in the zigzag model, and on the outside of the filament in the solenoid model.
C. The solenoid model is a one-start helix and the zigzag model is a two-start helix.
D. The helical pitch in the solenoid model is higher than the helical pitch in the zigzag model.
E. The zigzag model occurs in higher eukaryotes such as humans, while the solenoid model occurs in lower eukaryotes such as yeast.
C
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Desensitization
A. stimulates an increase in IgG. B. reduces the number of mast cells. C. increases the number of basophil cells. D. is a treatment for hypersensitivity reactions. E. stimulates an increase in IgG AND is a treatment for hypersensitivity reactions.
A biome is most specifically defined as ____
a. a vegetation type plus its associated microorganisms, fungi, and animals b. a biological community and the physical environment with which it interacts c. the total dry weight of plants present in a specific area at any given time d. an assemblage of species living in the same place e. a group of organisms of the same species living together at one time
Sickle-cell anemia is caused by a recessive mutation in the hemoglobin gene. However, heterozygote individuals also show a small percentage of sickled red blood cells. What type of inheritance pattern is this an example of?
A) Polygenic inheritance B) Sex linked C) Chromosomal nondisjunction D) Incomplete dominance
Which statement about natural selection is true?
A. It can have an evolutionary effect only if phenotypic differences are heritable. B. It is the same as evolution. C. It acts directly on genotypes. D. Changes in allele frequencies can occur only because of natural selection. E. It always results in reduced genetic variation.