You discover a new species of snail, Biologica terificia, and find that its haploid number is 4 (n = 4). The somatic cells of Biologica terificia are diploid. How many chromosomes are in a somatic cell of the snail in G1 phase?
A) 4
B) 8
C) 16
D) too many to count
B
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Water has a high specific heat because of the _____
A) polar covalent bond formed between the oxygen and a hydrogen of a single water molecule B) ionic bonds formed between the hydrogen of one water molecule and the oxygen of another water molecule C) hydrogen bond formed between the hydrogen of one water molecule and the oxygen of another water molecule D) covalent bond formed between the hydrogen of one water molecule and the oxygen of another water molecule
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?
The Ug99 strain of wheat stem rust _____
a. has been eradicated worldwide b. has wiped out most of the wheat around the world c. is unable to infect most wheat varieties d. can infect wheat varieties that were previously resistant to other strains e. is only a problem in the United States
Select the option that correctly finishes the following statement: "A cell's genome _________________."
(a) is defined as all the genes being used to make protein. (b) contains all of a cell's DNA. (c) constantly changes, depending upon the cell's environment. (d) is altered during embryonic development.