The area where two populations overlap and breeding occurs, even if biologists consider the
populations to be different species, is known as:
a. a homozygous zone.
b. a hybrid zone.
c. an autologous zone.
d. an adaptive zone.
e. a primary zone.
B
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A pyrimidine or purine base that has been joined with a ribose or deoxyribose sugar moiety is now termed a ________.
Fill in the blank(s) with the appropriate word(s).
What are examples of cells that support neurons both structurally and functionally?
A. dendrites and nodes of Ranvier B. neuroglia and nodes of Ranvier C. Schwann cells and dendrites D. dendrites, nodes of Ranvier, and neuroglia E. Schwann cells, oligodendrocytes, and other neuroglia
Which of these is a form of assisted reproductive technology in which a sperm cell is injected directly into an egg?
a. FSH b. IVF c. ICSI d. IUD
What determines the gender of a human fetus?
a. presence of an SRY gene b. presence of X and Y chromosomes c. absence of an X chromosome d. the sex chromosomes in the egg e. the presence of estrogen