Karyotyping is usually done using what kind of cells?
a. muscle
b. blood
c. cartilage
d. sex
e. epidermal
B
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Each chromosome has one or more ________ site(s) where replication begins.
A. bifurcate B. origin C. promoter D. replicon
Many species of gulls feed their chicks by regurgitating food. When parents return from foraging, the gull chicks peck at a red spot on the parent's bill, which causes the parents to open the bill and regurgitate their food
Chicks will peck at a red dot painted on any long, slender object. For the chicks, pecking is a ____ and the red dot is a ____ . For the adult gulls, the chicks pecking at their bills is a ____ and regurgitating food is a ____ . Fill in the blank with the appropriate word.
Adenoviruses are a frequent cause of acute upper respiratory tract infections in humans. Adenoviruses have a genome composed of double-stranded DNA; they are non-enveloped and their capsid contains a "fiber" protein that is analogous in function to the spike glycoproteins of HIV. Latency of the adenovirus can occur in lymphoid tissues. Based on this information, which of the following would be the best type of drug to develop to combat adenoviruses in humans?
A. a drug that inhibits reverse transcriptase B. a drug that binds to fiber protein receptors in human cells C. a drug that can switch off latency D. a combination of drugs that inhibit reverse transcriptase and that binds to fiber protein receptors in human cells E. a combination of drugs that inhibit reverse transcriptase, binds to fiber protein receptors in human cells, and switches off latency
Which of the following would likely not contribute to the surface area available for water absorption from the soil by a plant root system?
A) root hairs B) endodermis C) mycorrhizae D) fungi associated with the roots E) fibrous arrangement of the roots