You are interested in a single-stranded DNA molecule that contains the following sequence:
5?- .....GATTGCAT.... -3?
Which molecule can be used as a probe that will hybridize to your sequence of interest?
(a) 5?-GATTGCAT-3?
(b) 5?-TACGTTAG-3?
(c) 5?-CTAACGTA-3?
(d) 5?-ATGCAATC-3?
(d)
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A male peacock has enormous tail feathers that it uses in mating displays to attract females. While the tail feathers are an
A. The feathers require a lot of energy to produce. B. Bright feathers make males less susceptible to predation. C. The large tail feathers would make it easier to fly. D. The feathers make the male more attractive to other males. E. There are no disadvantages to having large tail feathers.
Invertebrates on land use __________ or __________ systems for gas exchange. Fill in the blank(s) with the appropriate word(s)
Net primary productivity in an ecosystem increases as mean annual temperature
A) and mean annual rainfall decrease. B) decreases and mean annual rainfall increases. C) increases and mean annual rainfall decreases. D) and mean annual rainfall increases.
Botulinum toxin- A toxin produced by the bacterium Clostridium botulinum.Known for sometimes lethal poisoning from infected meat products. In modern controlled medical or cosmetic use, the very same toxin is known as Botox.Tetanus toxin- Another very potent neurotoxin produced by Clostridium tetani.Strichnine- A highly poisonous alkaloid produced by the Strychnos nux-vomica tree,historically used to kill rats and other pests.Botulinum toxin, or "botox," has become popular for cosmetic surgery. The toxin prevents neurosecretory vesicles from docking at the plasma membrane and releasing neurotransmitter. How would this toxin affect the neuromuscular junction?
A. Since ACh is not released, the muscles are not activated to contract and remain relaxed. B. Buildup of ACh causes promiscuous activation of all nearby sensory neurons. C. Buildup of ACh leaks back into the brain, creating a calming effect. D. Since ACh is not released, the muscles stay in a state of repeated contraction.