Four elements, including ____, make up more than 96% of the mass of most living organisms
a. sodium
b. potassium
c. phosphorus
d. nitrogen
e. calcium
ANSWER: d
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Four of the five answers are features of the echinoderms. Select the exception
a. spiny skin b. decentralized nervous system c. radial symmetry d. a water-vascular system e. a mantle
In most flowering plants, one sperm nucleus fuses with an egg forming a zygote that develops into an embryo. Another sperm nucleus fuses with ____
a. the endosperm mother cell to produce three cells, each with one nucleus b. the endosperm mother cell, forming a diploid cell c. the endosperm mother cell, forming a triploid (3n) cell d. one of the smaller megaspores to produce what will eventually become the seed coat e. one of the smaller megaspores to produce a diploid endosperm
Gene expression in multicelled eukaryotic cells changes in response to _____
a. conditions outside the cell b. master gene products c. operons d. conditions outside the cell and master gene products
Hypoxic conditions __________
a) can promote the migratory properties of cancer cells, causing the spread of a tumor b) cause cancer cells to activate a transcription factor called HIF c) all of the choices are correct d) can cause cancer cells to induce the formation of new blood vessels