Evidence for the extinction of the dinosaurs approximately 65 million years ago comes from meteorites containing:
A. iridium.
B. palladium. C. carbon.
D. silicon.
E. plutonium.
Answer: A
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If a male silk moth lacked a receptor for bombykol, what deficit would likely be observed?
A. The male would have difficulty locating a mate. B. The male would have difficulty locating food. C. The male would have difficulty responding to alarm signals. D. The male would have difficulty attracting a female moth. E. The male would have difficulty molting.
An mRNA that contains the coding sequence for two or more structural genes is called a
A. polyintronic mRNA. B. polyextronic mRNA. C. polycistronic mRNA. D. polyexpressive mRNA. E. polyrepressor mRNA.
During ____, microtubules disassemble, pulling the chromatids to the ends of the spindle
a. prophase b. interphase c. anaphase d. metaphase e. telophase
This hormone is secreted from the posterior pituitary and regulates muscle contraction.
A. oxytocin B. epinephrine C. antidiuretic hormone D. prolactin E. adrenocorticotropic hormone