Which of the following would be an indication that evolutionary change is occurring within a species?
A. The number of organisms in the species is increasing.
B. New learned behavior patterns are appearing.
C. No mutations have occurred within individuals of the species.
D. Some alleles have been lost from the species.
D. Some alleles have been lost from the species.
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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
Which trait is a characteristic of most eudicots?
a. four or five floral parts, or multiples of four or five b. three furrows with pores on pollen grain c. vascular bundles organized as a ring in ground tissue d. branching fibrous root system e. two seed leaves of embryo inside the seed
A __________ is a hybrid, with two nonidentical
alleles (Aa). Fill in the blank(s) with the appropriate word(s).
Cheese manufacturing involves enzymatic or microbial processing of the milk protein ________ to form a coagulated mixture called curd
A) chymosin B) rennin C) malt D) lactic acid E) casein