Why is eating carrots thought to be useful for enhancing vision?
A. High levels of chlorophyll in carrots helps with photosynthesis in the eyes.
B. High levels of beta-carotene can lead to the production of a pigment used in vision.
C. High levels of carotenoids in carrots can allow vertebrate eyes to perform the dark reactions.
D. High levels of NADPH in carrots can allow vertebrate eyes to perform the light reactions.
B. High levels of beta-carotene can lead to the production of a pigment used in vision.
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Which of the following model organisms is/are LEAST suited to study the timing of morphological changes during embryonic development?
A. Mus musculus B. Gallus gallus C. Brachydanio rerio D. Drosophila melanogaster E. Mus musculus and Gallus gallus
Which of these nutrients are likely to be required for nitrogen fixation? (check all that apply)
_____ Nitrogen _____ Hydrogen _____ Sulfur _____ Phosphorus _____ Oxygen _____ Chlorine
Which of the following best explains why herbivorous organisms are more energetically efficient than those that consume meat?
a. herbivorous organisms are slower and therefore burn fewer calories b. herbivorous organisms obtain their energy directly from the sun c. herbivorous organisms are at the top of the food chain d. herbivorous organisms need to consume less food than meat eaters to obtain the same amount of energy e. herbivorous organisms are at the bottom of the food chain
When the resident microbiota prevents the establishment of a pathogen, it is called _______.
A. a nonliving reservoir B. microbial antagonism C. a superinfection D. disruption