Studies have shown that in the flowering plant Arabidopsis whether or not a root epidermal cell
develops a root hair is determined
a. by the distance of the cell from the root tip.
b. from the timing of cell division.
c. by positional information from cells of the root cortex.
d. shortly after the eight-cell embryo stage.
e. by the direction of cell division.
C
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During active transport, the solutes in the solution can be described as
a. moving from high concentration to low concentration. b. moving toward equilibrium. c. moving from low concentration to high concentration. d. moving down their concentration gradient.
Refer to the following diagram of a generalized tetranucleotide to answer questions (a) through (e)
(a) Is this a DNA or an RNA molecule? ________ (b) Place an "X" (in one of the circles in the diagram) at the 3' end of this tetranucleotide. (c) Given that the DNA strand, which served as a template for the synthesis of this tetranucleotide, was composed of the bases 5' – A C A G – 3', fill in the parentheses (in the diagram) with the expected bases. (d) Suppose that one of the precursors for this tetranucleotide was a 32P-labeled guanine nucleoside triphosphate (the innermost phosphate containing the radioactive phosphorus). Circle the radioactive phosphorus atom as it exists in the tetranucleotide. (e) Given that spleen diesterase (breaks between the phosphate and the 5' carbon) digests the pictured tetranucleotide, which base(s) among the breakdown products would be expected to be attached to the 32P? Fill in the blank(s) with correct word
Why would a recombinant DNA molecule be inserted into a host cell?
a. It can protect the recombinant DNA. b. Restriction enzymes can only be used inside of a cell. c. It can be copied, transcribed, and translated into a desired protein. d. Plasmids cannot be isolated outside of a host cell.
Which factor has the greatest influence on the expression of a genetic disorder such as Prader-Willi syndrome or Angelman syndrome through the process of genomic imprinting?
A. Paternal age at time of conception B. Maternal age at time of conception C. The gender of the parent transmitting the deletion D. The number of bases deletion from the chromosome