The water balance problem of plants living in salty soil is the result of:
a. water moving out of plant roots by osmosis.
b. extensive leaching.
c. a low soil pH.
d. low concentrations of micronutrients.
e. excessive run off
A
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The atomic number corresponds to the number of ________ in a specific element, while the atomic weight corresponds to the number of ________ in a specific element.
A. protons; protons and neutrons B. protons and neutrons; neutrons C. protons; neutrons D. neutrons; protons
A catalase test was performed from a sheep blood agar plate on a colony of streptococci, and bubbling was observed. Which of the following statements explains this discrepancy?
a. Catalase is the inappropriate test to use on colonies of streptococci; therefore the re-sults are invalid. b. The colony may have been contaminated with sheep red blood cells, causing a false-positive result. c. The colony was most likely enterococci, not streptococci. d. No discrepancy is present. Streptococcus is a catalase-positive colony.
As the polypeptide is elongating in translation,
what is the ribosome doing?
a. removing incorrectly added amino acids. b. moving along the mRNA transcript bonding amino acids to each other. c. travelling back and forth between the nucleus and the growing polypeptide with information on which amino acids to add. d. removing the non-coding introns. e. doing more than one of these functions
If a pair of homologous chromosomes fails to separate during anaphase of meiosis I, what will be the chromosome number of the four resulting gametes with respect to the normal haploid number (n)?
A) n + 1; n + 1; n - 1; n - 1 B) n + 1; n - 1; n; n C) n + 1; n - 1; n - 1; n - 1 D) n + 1; n + 1; n; n E) n - 1; n - 1; n;n