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

Biology & Microbiology

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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 hypoxia

Biology & Microbiology

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.

Biology & Microbiology

Both cnidarians and ctenophores manufacture their own nematocysts for capturing prey

Indicate whether the statement is true or false

Biology & Microbiology

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

Biology & Microbiology