What type of lipids are found in all cell membranes?
A. Tryglycerides
B. Phospholipids
C. Cholesterol
D. Waxes
E. Diglycerides
Answer: B. Phospholipids
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If cells of an individual contain the same set of genes, how do these cells become different from each other during development?
A) Different cell type-specific regulatory elements in DNA are created during development. B) Different cell type-specific regulatory elements in DNA are selectively lost during development. C) Differences in extracellular signals received by each cell lead to differences in the types of regulatory proteins present in each cell. D) Differences develop in promoter sequences that lead to different signals being produced by each type of cell.
An animal that is attached to the substrate and cannot move from one place to another is said to be:
A. rooted B. sessile C. sedentious D. fixated E. commatose
Fermentation is a process that proceeds without oxygen. Such a process can be described as ________.
Fill in the blank(s) with the appropriate word(s).
You mate a squash with the genotype AAbb with a squash with the genotype aaBB. The resulting F1 squash are all AaBb. After mating two F1 squash, you obtain an F2 generation of squash as follows: ("-" = either allele)
A- B- 5 A- bb 45 aa B- 47 aa bb 3 Total 100 a) What does this tell you about assortment of the two traits? b) What could account for the distribution obtained? What will be an ideal response?