This animal has a coelom, a closed circulatory
system, and a clitellum. This animal is ___.
a. an earthworm
b. a leech
c. a roundworm
d. a planarian
e. more than one of these
A
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What is the relationship between operons and transcription units?
a. They are synonymous terms. b. An operon consists of a transcription unit plus associated regulatory DNA sequences. c. A transcription unit consists of an operon plus associated regulatory DNA sequences. d. An operon is composed of multiple transcription units. e. A transcription unit is composed of multiple operons.
Pepsin is an enzyme that plays a role in the breakdown of proteins in the stomach. Given this information and the graph below, what could you say would likely be the pH of your stomach?
1.about 6
2.about 4
3.about 7
4.about 1.5
One of the factors that helps animal-pollinated flowering plants transfer pollen to plants of the same species is that
A) pollinators are able to rapidly extract nectar from any species of flower, regardless of the pollinators' past or recent experience with a given flower type. B) most pollinators broadly use many different types of flowers. C) many pollinators have limited learning capacities and are most successful at obtaining food if they continue to visit the same type of flower after learning how to extract its nectar. D) pollinators only visit flowers that produce massive amounts of pollen.
Select the option below that most accurately predicts the relative rates of diffusion of these molecules (fastest to slowest):
What will be an ideal response?