In the 1700s, Swedish scientist Carl Linnaeus developed the first comprehensive system for classifying living things. His system included two kingdoms—animal and plant. In the 1860s, scientists expanded this classification system to three kingdoms. The new kingdom included all single-celled organisms. What name did they give this third kingdom?
A) Plantae
B) Bacteria
C) Animalia
D) Protista
Ans: D) Protista
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Respond to statements 151–155 in reference to the five animal
phyla listed below. a. Annelida b. Arthropoda c. Mollusca d. Echinodermata e. Rotifera D 151. Trilobites were members of this phylum. M 152. The larval stage in this phylum has bilateral symmetry, whereas the adult stage exhibits radial symmetry. M 153. Although most members are enclosed by hardened shells, this phylum name literally means “soft body.” E 154. This phylum has the greatest number of species. D 155. “Wheel animals” are in this phylum.
C4 photosynthesis is an adaptation to hot, dry conditions in which:
A. oxygen is stored in the root B. light energy is stored in chloroplasts C. CO2 is fixed and stored in the leaf D. water is stored in the stem
In a ________ assay, DNA extracted from a microbial community or environmental sample is incubated with selected complementary probe or sample sequences (often ________) and allowed to hybridize. The level of hybridization to each probe (gene) is measured. Analysis of DNA hybridization thus reveals the presence or absence of the specific genes in the environment. Most importantly, this can be done without ________.
What will be an ideal response?
The element carbon has 6 protons and 6 neutrons in its nucleus. Which of the following represents the carbon-14 isotope?
a. 6 protons, 8 neutrons b. 6 protons, 7 neutrons c. 7 protons, 6 neutrons d. 8 protons, 6 neutrons