Osmoregulation is the control of ____
a. the internal environment
b. temperature
c. metabolic wastes
d. water and ion balance
e. hyperthermia
ANSWER: d
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Following reports that stained chromosomes "disappeared" while observing cell division, scientists in the early 1900s determined the molecule of heredity to be
A) DNA. B) RNA. C) protein. D) lipids. E) carbohydrates.
CRISPR sequences occur naturally as
A) an antiviral immune system in bacteria. B) an antibacterial immune system in eukaryotes. C) an antiviral immune system in eukaryotes. D) a gene editing system in bacteria.
There are sixty one different codons that code for amino acids, but only twenty different amino acids, meaning that the genetic code is ________
Fill in the blank(s) with correct word
Which microscope is especially useful in studying the surface structures of intact cells and viruses?
a) Transmission electron microscope b) Scanning electron microscope c) Phase-contrast microscope d) Darkfield microscope