The only autosomal trisomy in which affected people reach adulthood involves chromosome ________
a. 13
b. 18
c. 21
d. 17
c
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An example of purple photosynthetic bacteria metabolic flexibility is seen in Rhodospirillum rubrum using a "decision-making" process; in oxic conditions, the bacterium uses fermentation, photoheterotrophy, or photoautotrophy versus when oxygen is not present that the photosynthetic apparatus is used to grow chemoorganotrophically.
Answer the following statement true (T) or false (F)
A flower is not ideally matched with a pollinator that visits it daily. Why might that be?
A) The flower does not need pollination. B) The flower is imperfect. C) The flower does not have sufficient nutrients. D) The flower has several other pollinators with differing traits.
L-lysine is an essential amino acid and must be supplied in the diet. By comparison, the stereoisomer D-lysine is not biologically active. Why can your body only utilize one form?
A. Antibodies recognize the D form and destroy it before your body can use it for nutritional purposes. B. Since the L form and D form are chiral molecules, they will bind together and inhibit utilization of the D form. C. Enzymes can only recognize a single, specific stereoisomer. D. Since the L form and D form are enantiomers, they will bind together and inhibit utilization of the D form.
In Bacteria and Archaea, most proteins that are transported across membranes begin with a 15–20 residue amino acid sequence called a
a. –35 sequence. b. sec sequence. c. signal sequence. d. tat sequence.