Which statement best describes the phylogenetic relationship between protists, fungi, plants, and animals?
a. Fungi and animals share a common protist lineage, while plants arose from a different protist ancestor.
b. Fungi and plants share a common protist lineage, while animals arose from a different protist ancestor.
c. Animals and plants share a common protist lineage, while fungi arose from a different protist ancestor.
d. Plants, animals, and fungi each arose from a different protist lineage.
e. Plants, animals, fungi, and protists each arose from the same prokaryotic ancestor.
ANSWER: a
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N-terminal sequences of four different bacterial proteins are listed below. Which of these proteins would have the shortest half-life?
A. Ala-Val-Ile---- B. Ser-Glu-Gly---- C. Lys-Gln-Pro---- D. Thr-Gly-Ala----
Members of the class ______ have two stomachs, one of which can reach outside of its body to secrete digestive juices onto its prey to liquify it.
a. Asteroidea b. Ophiuroidea c. Holothuroidea d. Crinoidea
Predict why insect stings and medication injections more often provoke anaphylactic shock, as compared to other allergens found in food or in air.
A. The allergens go directly into the blood in large amounts, compared to allergens entering the digestive tract or respiratory tract. B. Chemicals injected as medications cause problems in immune response, resulting in a reduced immune coverage. C. Chemicals from insects cause a combination of antibody types to be produced, resulting in much larger amounts of total antibody. D. Histamine is overproduced as a result of injected chemicals.
What is the first step in energy flow through an ecosystem?
a. Top-level carnivores eat the herbivores or omnivores within the ecosystem. b. Producers absorb solar energy. c. Producers absorb nutrients from the soil. d. Producers are eaten by the herbivores. e. Decomposers break down the organic matter and make it available for the producers.