An arrowworm is a type of planktonic
a. herbivore.
b. detritivore.
c. carnivore.
d. omnivore.
e. filter feeder.
C
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You have discovered a new coccoid-shaped microorganism with no nucleus, a rigid cell wall, and a diameter of 2 µm. Chemical tests reveal that its cell wall does NOT contain peptidoglycan. The new microorganism is
A) most likely a bacterium. B) most likely a eukaryote. C) most likely an archaeon. D) either a bacterium or an archaeon.
What type of natural selection are the population of voles going through?
A population of voles (very small mammals) live in a shady forest. The all of the voles are a light tan color, a dark brown coloration arises by a new mutation. The darker voles are harder for predators to see in the leaf litter, thus they are less susceptible to predation. After 10 generations the majority of voles in the population are the dark brown color. In the figure above the solid red line represents the number of light colored individuals before the mutation and the black dashed line represents the number of dark brown individuals after 10 generations.
A. Directional selection.
B. Stabilizing selection.
C. Diversifying selection (disruptive selection).
D. Balancing selection.
E. Negative frequency-dependent selection.
Most of the absorption of nutrients (besides water) takes place in the ________.
A. stomach B. small intestine C. esophagus D. large intestine
Answer the following questions true (T) or false (F)
1. Microscopic algae and bacteria produce over half of the oxygen in the atmosphere. 2. The core of some viruses is carbohydrate in nature. 3. Scientists do not consider viruses to be alive because viruses cannot metabolize outside a host cell.