A bean pod is
a. a seed container.
b. a fruit.
c. a part of the stamen.
d. both a and b.
c
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Which of the following strategies enable non-acidophilic bacteria to endure lower pH environments?
A. Proton pumps that pump H+ out of the cell B. All of the choices are correct. C. Presence of internal buffers D. Synthesis of acid shock proteins that protect other cellular proteins
How do the features of a larval tunicate differ from an adult tunicate? Check all that apply.
_____ Larval tunicates have a conspicuous notochord that is lost by the time they reach adulthood. _____ Larval tunicates have a hollow dorsal nerve cord that is reduced to a ganglion in adults. _____ The tail of a larval tunicate is lost by the time it transforms into an adult. _____ The pharynx of the larval tunicate becomes more prominent in the adult. _____ The larval tunicate lacks an incurrent and siphon but the adult has both structures.
The female reproductive tract of some Drosophila species blocks sperm of another species from reaching her eggs
This is an example of ____.
a. gametic isolation b. hybrid breakdown c. hybrid inviability d. mechanical isolation e. temporal isolation
Please match the types of mutations with the statements that most accurately describe them, to test your understanding of their causes.
Frameshift mutation A) Random change in the DNA arising from errors in replication that occur without a known cause B) Result from exposure to known mutagens, which are primarily physical or chemical agents that damage DNA C) Changing of single base in the DNA code that may result in the placement of a different amino acid D) Addition or deletion of bases that changes the reading of mRNA codons