Why can't you buy fern seeds from a garden supply store?
A) The seeds are extremely rare.
B) Ferns do not produce seeds.
C) Fern seeds must stay moist.
D) Fern seeds do not survive long after they are produced.
E) The seeds are too small to package.
B
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If a strain of bacteria had a mutation that blocked expression of the lac repressor, what would you expect as a result?
A. The mutant strain would outcompete wildype strains, since it could always utilize lactose. B. The mutant strain would grow at the same rate as wildtype if lactose was not present. C. The mutant strain would waste energy producing enzymes in the absence of lactose. D. The mutant strain would act the same, because it would still require lac activator protein to turn on. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain and what do they mean? Gather Content · What do you already know about the lac operon? Consider Possibilities · Consider the different answer options. Which can you rule out? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
When the first example of a duckbilled platypus was presented for identification, the scientists that received the specimen tried to remove all of its pieces and parts to prove it had been contrived. Indeed, it is an odd creature seemingly made up of spare parts from various classes of animals. The bill of the platypus is not related to the bill of a duck though they seem so similar and evolved to solve a similar environmental pressure (accessing food while in the water). What do we call structures like these bills?
a. homologous b. vestigial c. analogous d. phylogenetic
Many diseases, cancers, and even normal human variations can be caused by mutations and variations in the DNA nucleotide sequence. The most likely immediate result of DNA having a different nucleotide sequence is that
A. the protein resulting from the DNA mutation would be denatured and nonfunctional. B. the peptide bonds in the protein would by hydrolyzed and the protein would fall apart. C. no direct result of change in the protein molecule would occur if DNA is mutated. D. the polypeptide of a protein would be altered. E. the ability for the cell to make proteins would fail.
If the proton pumps of guard cell were damaged, transpiration would decrease.
Answer the following statement true (T) or false (F)