Why is the smooth endoplasmic reticulum unable to synthesize proteins?
A) No ribosomes are attached to its surface.
B) There is no supply of free amino acids that it can easily access.
C) It stores calcium, which is a known inhibitor of protein synthesis.
D) It has no DNA to direct synthesis of proteins.
A) No ribosomes are attached to its surface.
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A restriction enzyme is most comparable to a ___________
A. screwdriver D. fork B. hammer E. ruler C. pair of scissors
Some eukaryotic DNA sequences act as introns in the cells of some tissues and exons in the cells of
other tissues. This allows:a. prevention of harmful mutation. b. regulation of the rate of transcription. c. formation of different types of closely related proteins. d. regulation of the rate of translation. e. repression of DNA replication.
The most likely explanation for why toothed whales have a blowhole is
A. blowholes are better for breathing underwater than gills are. B. they evolved from an animal with gills. C. they evolved from an animal with nostrils. D. blowholes are better for large animals.
A new prokaryote is recovered from a remote saline hot spring. Design a set of experiments to determine whether the organism is thermophilic or thermoduric, halophilic or halotolerant
What will be an ideal response?