Ions are atoms or molecules that carry an electrical charge sure to the gain or loss of:
A) protons
B) electrons
C) neutrons
D) positrons
Ans: B) electrons
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If a pollen grain lands on the stigma of a plant that is not related to that plant then the following would happen:
A. The pollen grain would be too large or too small to enter the stigma. B. The pollen would likely not attach to the stigma. C. The pollen grain would be unable to grow through the stigma. D. The pollen grain would be unable to form sperm nuclei. E. The pollen grain would be ejected from the stigma.
Which of the following occurs when a person’s body temperature increases?
a. Blood vessels dilate. b. Interstitial fluid decreases. c. Blood vessels constrict. d. Interstitial fluid increases.
In some ciliate protozoa, the codons UAA and UAG encode glutamate, rather than acting as STOP codons. How does this compare to other species?
A. This is unusual - almost all species share the same "universal" genetic code. B. This is not unusual - while most species have a similar genetic code, there are often variations for some of the amino acids. C. This is typical - every species has its own unique genetic code.
During transcription, which strand of a DNA molecule is copied into mRNA?
a. the non-template strand b. both strands of the DNA c. the strand that has the same polarity as the mRNA d. the template strand