Splicing of pre-rRNA produces

a. the 28S rRNA.
b. the 18S rRNA.
c. both 28S and 18S rRNAs.
d. None of the above


Ans: c. both 28S and 18S rRNAs.

Biology & Microbiology

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Proteins made on ribosomes may be further modified within which organelle?

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When conditions are inhospitable, some protists become dormant by forming ________.

Fill in the blank(s) with the appropriate word(s).

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What do the alveoli of mammalian lungs, the gill filaments of fish, and the tracheoles of insects all have in common?

a. They use a circulatory system to transport absorbed O2. b. Their respiratory surfaces are invaginated. c. They function using countercurrent exchange. d. They have a large, thin surface area for gas exchange. e. All of the listed responses are correct.

Biology & Microbiology