The antiparallel arrangement within DNA molecules refers to
A) Each base bonding at the 1' position of the sugar.
B) An original parent DNA strand and one newly synthesized DNA strand comprising a new DNA molecule.
C) A purine always bonding to a pyrimidine.
D) One helix strand that runs from the 5' to 3' direction and the other strand runs from the 3' to 5' direction.
D) One helix strand that runs from the 5' to 3' direction and the other strand runs from the 3' to 5' direction.
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Roots are capable of which types of growth?
A. primary growth only B. secondary growth only C. both primary and secondary growth D. apical growth only E. lateral growth only
Viral meningitis is much more common than bacterial meningitis
Indicate whether this statement is TRUE or FALSE.
In Drosophila, the hunchback gene encodes a protein (HB) that has a role in the development of the thorax. In the zygote and embryo, the expression of hunchback is stimulated by high concentrations of Bicoid protein. Which of the following is accurate about the expression of hunchback in the Drosophila embryo?
A. The HB protein is produced throughout the embryo. B. The HB protein is produced only in the anterior half of the embryo. C. The HB protein is produced only in the posterior half of the embryo. D. The HB protein is produced in the middle of the embryo; but is not produced in the anterior or posterior end. E. No HB protein is produced in the embryo.
All eutherian mammals possess which anatomical characteristic?
a. stereoscopic vision b. a pouch for young to mature c. homodont teeth d. a complex placenta