Evolution has been tested in various ways. Genetic, fossil, anatomical, physiological and behavioral studies all confirm that evolution is the mechanism of the origin of species. Thus, in science evolution is considered a scientific
____.
a. fact
b. hypothesis
c. law
d. theory
e. guess
ANSWER: d
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B cells interacting with helper T cells are stimulated to differentiate when _____
A) B cells produce IgE antibodies B) B cells release cytokines C) cytotoxic T cells present the class II MHC molecule-antigen complex on their surface D) helper T cells differentiate into cytotoxic T cells E) helper T cells release cytokines
In marine and freshwater environments, the penetration of sunlight and the mixing of nutrients, oxygen, and waste products are the dominant factors controlling the microbial community.
Answer the following statement true (T) or false (F)
What is the role of the cap on a sperm's head?
a. It provides directional guidance for sperm in female reproductive tract. b. It provides motility for sperm. c. It provides energy for sperm. d. It provides enzymes to digest outer jelly coat layer of oocyte. e. It provides enzymes to digest sperm body to release nucleus.
What organism has been used extensively for expressing and studying the effects of recombinant genes and mutations?
What will be an ideal response?