Why are hydrocarbons insoluble in water?
A) The majority of their bonds are polar covalent carbon-to-hydrogen linkages.
B) The majority of their bonds are nonpolar covalent carbon-to-hydrogen linkages.
C) They are hydrophilic.
D) They exhibit considerable molecular complexity and diversity.
E) They are less dense than water.
Answer: B
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Answer the following statements true (T) or false (F)
1. RNA polymerase can bind to the promoter region of the DNA even when the lac repressor is bound to the operator site. 2. Both eukaryotes and prokaryotes require a promoter region for gene transcription. 3. A cis-effect is a form of gene regulation that can occur between two DNA segments that are not physically adjacent. 4. Eukaryotic genes are almost always organized in groups, similar to operons in prokaryotes.
Ras proteins are of interest to researchers because of their role in ____
a. reproduction b. linking plant hormones to germination c. the development of many types of cancer d. relieving cluster headaches e. eliciting the fight-or-flight response
Immersion oil is used with some microscope lenses because it has the same __________ as glass.
Fill in the blank(s) with the appropriate word(s)
Which of the following fungal infections may progress to infection of the brain?
A) Coccidioides immitis B) Cryptococcus neoformans C) Mucor D) both Coccidioides immitis and Cryptococcus neoformans E) Coccidioides immitis, Cryptococcus neoformans, and Mucor