When geese or ducks are imprinted, this means that they ____
a. will return to the place they were born to breed and raise their own young
b. have become habituated to harmless stimuli
c. have been experimentally trained by operant conditioning
d. learned the features of a suitable mate during a critical period
e. have two nonfunctional copies of a particular gene
ANSWER: d
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__________ may cause cancer.
A. Chemotherapeutic agents B. Mutagenic agents C. Meiosis D. Cytokinesis
The functions of the casparian strip include all of the following EXCEPT.
A. controlling materials that enter the vascular cylinder B. enabling a one-way passage of water and nutrients into the vascular cylinder C. forcing water to pass in between cells of the endodermis D. Keeping valuable nutrients inside the vascular cylinder
Scientific evidence suggests that Earth had cooled enough for_____ to accumulate by 4.3 billion years ago
a. carbon monoxide b. carbon dioxide c. oxygen d. water e. nuclei
Once uterine contractions have begun, the female body releases several hormones that act in a positive feedback loop. The purpose of this feedback loop is ________.
A. to promote the development of a new follicle B. to ensure continued contractions until labor is complete C. inhibit the release of prostaglandins D. decrease the number of oxytocin receptors in the uterus