Which group has six legs and two antennae?
a. crustaceans c. spiders
b. insects d. horseshoe crabs
B
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Gene regulation during development is _____, which means that _____
A. restrictive; genes are successively lost over time B. restrictive; genes lose developmental potential over time C. hierarchical; genes expressed at each stage control the expression of genes that act later D. hierarchical; genes are turned on in a specific sequence, starting with totipotent and ending with multipotent E. combinatorial; genes expressed at each stage control the expression of genes that act later
Which structure is an example of a tissue?
a. basal lamina b. skin c. neurons d. bone e. fibroblasts
Blood tests for cancer detect the presence of ____.?
a. cancer cells
b. DNA
c. carcinogens
d. tumor markers
e. enzymes
Kelp, a seaweed that is anchored to the seafloor by rootlike structures and can grow to heights of 60 m, is a kind of
A) water mold. B) brown alga. C) green alga. D) diatoms.