What molecular interaction allows histones to interact with DNA?
What will be an ideal response?
positive charges of histones
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Which of the following statements characterize heterospory?
_____ It involves production of two different types of spores from a single sporangium. _____ It involves production of two different kinds of spores, one growing into male gametophytes and the other into female gametophytes. _____ It increases the chance of cross-fertilization. _____ It increases the potential for genetic variation and aids evolutionary flexibility. _____ It occurs in seed plants and seedless vascular plants.
A testcross is a mating of an individual with an unknown genotype and an individual that
A. is a wild-type. B. is homozygous dominant. C. is heterozygous. D. has a known genotype. E. is homozygous recessive.
The last known population of Neanderthals lived as recently as ____ years ago
a. 8,000 b. 18,000 c. 28,000 d. 38,000 e. 48,000
A covalent chemical bond is one in which _____
A) electrons are removed from one atom and transferred to another atom so that the two atoms become oppositely charged
B) protons and neutrons are shared by two atoms so as to satisfy the requirements of both atoms
C) outer-shell electrons of two atoms are shared so as to satisfactorily fill their respective orbitals
D) outer-shell electrons of one atom are transferred to fill the inner electron shell of another atom
E) electrons from the same atom, but opposite spins, are paired