Which of the following statements concerning trees is true?
a. Each unrooted tree corresponds to numerous rooted trees.
b. An unrooted tree with k species has 2k - 3 branches.
c. An unrooted tree with k species has 2k - 3 times as many rooted trees as unrooted trees.
d. None of the above.
e. All of the above.
E
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B and T cells become activated and divide to produce identical cells when _____
a. activated by an antigen b. major histocompatibility genes are expressed c. activated by the presence of cancerous cells d. plasma cells begin to produce and secrete antibodies e. killer T cells bind to any pathogen
The procedure in which a single stain is used to visualize microorganisms is called ________ staining.
Fill in the blank(s) with the appropriate word(s).
Anthers produce
a. ovules. b. seeds. c. megaspores. d. nectar. e. none of these.
Cleavage division converts the zygote into the ____
a. fertilized egg b. blastocyst c. embryo d. morula e. fetus