When a cell begins to enlarge after cell division, the
primary cell wall
a. is rather elastic and can be stretched.
b. allows water uptake.
c. becomes thicker due to the addition of
polysaccharides.
d. is rather elastic and can be stretched and allows
water uptake.
e. is rather elastic and can be stretched and
becomes thicker due to the addition of
polysaccharides.
Answer: d
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The ability to form endospores in bacteria within Bacillales, Clostridiales, and Lactobacillales suggests the genotype/phenotype evolved
A) at least three separate times in these divergent orders. B) at least once, and horizontal gene transfer among relatives explains its presence in other orders. C) only once in an ancestor to these three orders, due to the high number of genes required. D) either at least once and horizontal gene transfer among relatives occurred or once in a common ancestor.
The genetic code is said to be degenerate because ____
a. some codons that do not specify an amino acid b. most amino acids are represented by more than one codon c. the code varies considerably between different organisms d. the code is commaless, with no indicators of spaces between codons e. the code varies considerably between different cell types within a multicellular organism
The enzyme formate dehydrogenase (FDH) splits formic acid to H2 and CO2 and is crucial to survival during fermentation because if fermentive intermediates were allowed to accumulate within the cell, the internal pH would become far too ________ to support viability.
A. alkaline B. acidic C. hypertonic D. hypotonic
A distinctive red rash on the cheeks with an otherwise mild illness is most likely
A) rubella. B) measles. C) fifth disease. D) roseola. E) chickenpox.