Actin filaments may form each of the following except
A) 3D filament networks (gels).
B) contractile bundles.
C) branched networks.
D) bundles of parallel filaments.
E) axonemes containing doublet microfilaments.
Answer: E
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When analyzing a cross involving two traits, each trait is analyzed separately, and then the frequencies of each are combined to yield the observed phenotypic ratios
a. True b. False Indicate whether the statement is true or false
Microtubules are assembled from ____
a. keratin b. myosin
c. laminin d. actin e. tubulin
Answer the following statements true (T) or false (F)
1. A recessive allele is one that is masked if a dominant allele is also present. 2. The most common allele for any trait is always the dominant allele. 3. Genotypes are the outward expression of an allele combination. 4. Mendel's law of segregation states that the two alleles of each gene are packaged into separate gametes. 5. Any dihybrid cross should theoretically yield a 3:1 phenotypic ratio.
Which method of transport is responsible for low concentrations of sodium and high concentrations of potassium within the cells of the body?
a. simple diffusion b. facilitated diffusion c. vesicular transport d. active transport