Which class includes octopuses, squids, and nautiluses?
a. Polyplacophora
b. Cephalopoda
c. Bivalvia
d. Gastropoda
Ans: b. Cephalopoda
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The rRNA gene sequences of hyperthermophilic Archaea and Bacteria have diverged ________ over time, likely due to ________
A) relatively little / strong constraints on sequence changes at higher temperatures B) substantially / higher mutation rates at higher temperatures C) relatively little / low mutation rates in these ancient organisms D) substantially / DNA damage at higher temperatures
Which cells make you immune to a disease to which you were previously exposed?
1.effector cells 2.memory cells 3.dendritic cells 4.phagocytes 5.fibroblasts
If cytokinesis did NOT happen at the end of a cell's mitotic division what would be the result ?
A) Four cells B) A single cells with one nucleus C) A single, multinucleated cell D) Two cells
Halophiles grow equally well in the presence or absence of high salt concentrations
Indicate whether the statement is true or false