Estuaries for many transient species are considered:
a. a place to spawn.
b. nurseries.
c. too full of predators for juveniles.
d. very stable environments.
B
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What is the underlying reason that a lambda phage would need to switch from the lysogenic state to the lytic state?
A) To have its genome replicated B) To kill its host cell C) To make more of the Cro protein D) To be more efficient in its use of resources E) To escape an endangered host cell
The vesicles that are anchored to the plasma membrane at a nerve cell presynaptic site are specialized for
A) constitutive secretion. B) regulated secretion. C) polarized secretion. D) lysosome secretion. E) endocytosis.
Which organizational unit includes the fewest species of organisms?
a. class b. biosphere c. community d. population e. ecosystem
On a trip to the Southwest United States, you and a friend collect some seeds from a piñon, a type of pine tree. Your friend also gathers a small bagful of soil from under the piñon tree. Back home, both of you plant your seeds in commercial sterilized
potting soil, but your friend adds a spoonful of the collected dirt to each of her pots. Her seedlings do better than yours. What is the likeliest explanation for your differences? A) Pine seedlings are better adapted to the sandy soil of the Southwest than to commercial potting mix. B) The soil from the Southwest probably contained macronutrients missing from the potting mix. C) The soil from the Southwest probably contained nitrogen-fixing bacteria that colonized the seedlings' root nodules. D) The soil from the Southwest probably contained fungi able to establish a mycorrhizal association with the seedlings' roots.