What carries the coded information for making specific proteins from DNA to ribosomes?
A. mRNA
B. rRNA
C. tRNA
D. RNA polymerase
Answer: A. mRNA
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Studies indicate that in utero nicotine exposure can cause breathing abnormalities in neonatal mammals, including
____.
a. elevated breathing rate while awake b. increased frequency of apneas during sleep c. delayed arousal from sleep in response to hypoxia d. elevated breathing rate while awake and increased frequency of apneas during sleep
e. increased frequency of apneas during sleep and delayed arousal from sleep in response to hypoxiaBoth cnidarians and ctenophores manufacture their own nematocysts for capturing prey
Indicate whether the statement is true or false
The aortic semilunar valve opens when the
A) arterial pressure is lower than the ventricular pressure. B) right ventricle is in diastole. C) atrioventricular valves open. D) atrium is in systole. E) pulmonary semilunar valve closes.
Tundra soils are usually __________ and have __________ in the uppermost layer of soil
a. nutrient poor; little organic litter b. nutrient rich; much organic litter c. frozen; nutrients d. moist; dead plant material e. sandy; high pH