Blood in the superior and inferior vena cava is:
a. oxygen-rich
b. oxygen-poor
c. traveling in an artery
d. in pulmonary circulation
e. nutrient rich
b
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If one reproductive strategy of a eukaryotic organism is gamete fusion, what can be concluded about that organism?
A. The organism reproduces asexually. B. Progeny organisms are identical to each other. C. The organism participates in vertical gene transfer. D. The organism participates in horizontal gene transfer.
Hormones are typically involved in maintaining ____ , or a given steady state for a particular factor (like sugar or calcium levels in the blood)
Fill in the blank with the appropriate word.
Morphological traits are commonly used to identify species, which of the following can also be used?
A. The ability to interbreed. B. Molecular similarity (DNA and chromosome comparisons). C. Ecological factors. D. Evolutionary relationships. E. All of these.
The figure below represents a joint in the hind leg of a grasshopper. The exoskeleton of the leg is indicated by the two pairs of parallel black lines. A muscle that moves this leg is fixed to the skeleton at the end marked with a blue star. When the muscle contracts, it will pull on the tendon at its opposite end. Which configuration shows the most likely arrangement of the exoskeleton and a muscle that increases the flexion of this leg?
A. A B. B C. C D. D