Cartilaginous fishes retain __________ in their body,
so they do not lose or gain water by osmosis. Fill in the blank(s) with the appropriate word(s).
Answer: urea
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The enzyme responsible for replacing RNA primers with DNA is
A. DNA polymerase. B. helicase. C. topoisomerase II. D. DNA ligase. E. DNA replicase.
A farmer is concerned that if she plants seeds for her next harvest, many of them will remain dormant and fail to grow. Depending on the plant, what steps can the farmer take to ensure that many of her seeds will germinate?
A. She can treat her seeds with red light prior to planting. B. She can put her seeds in the refrigerator for a few months before planting. C. She can rub her seeds with sand paper prior to planting. D. She can feed the seeds to her cows and collect them after they have passed through the animals' digestive tracts.
Slime molds and water molds are types of fungi
Indicate whether this statement is true or false.
The purpose of a mordant in the Gram stain is to
A) remove the simple stain. B) make the bacterial cells larger. C) make the flagella visible. D) prevent the crystal violet from leaving the cells. E) make gram-negative cells visible.