Mesophyll cells are:a
arranged tightly together.
b. separated by intercellular spaces.
c. responsible for the opening and closing of stomata.
d. devoid of chloroplasts.
e. covered by a waxy cuticle, which they secrete
b
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If a short sequence of DNA is 5' AATTGCCGT 3', its complement is
A. 5' AAAACGCCA 3'. B. 3' TTAACGGCT 5'. C. 3' TTAACGGCA 5'. D. 3' TTAAGCCGA 5'. E. 5' TTAACGGCA 3'. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain? Gather Content · What do you already know about base-pairing? 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?
Microbial species are difficult to define because they are often polyphyletic
Indicate whether the statement is true or false.
Migratory birds in the Northern Hemisphere most likely head to tropical overwintering grounds because ____
a. they are looking for appropriate sites for egg-laying b. of seasonal changes in the abundance of predators c. they are looking for appropriate breeding sites d. of seasonal changes in food supplies e. they are ectotherms and cannot withstand cold temperatures
If a mutation prevents the formation of the antiterminator 2+3 loop in the trp operon, what would be the effect?
A. no effect, as 2+3 loop has no function B. transcription only when tryptophan is absent C. transcription only when tryptophan is present D. constitutive attenuation of transcription E. constitutive transcription