Why do transcription and translation take place in two different locations?
A) DNA is located in the nucleus, whereas the ribosomes needed for translation are not in the nucleus.
B) DNA is located in the nucleus, whereas the ribosomes needed for transcription are found outside the cell.
C) Translation takes place in the nucleus, whereas the DNA is located elsewhere.
D) DNA is located in the nucleus, whereas the ribosomes needed for translation are found outside the cell.
Answer: A
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Testosterone has important regulatory functions in humans and many other animals. Molecules with regulatory
functions like testosterone are called ____.
a. phytosterols b. enzymes c. lipoproteins d. hormones e. receptors
What is the most outstanding characteristic of prokaryotic cells?
a. Prokaryotes have an elaborate system of internal membranes. b. Prokaryotic cells do not have a cell wall. c. Prokaryotic cells contain energy-collecting pigments. d. Prokaryotic cells do not have a nuclear membrane. e. Prokaryotic cells possess a variety of organelles.
The polar end of a phospholipid ____
a. is in contact with an aqueous solution b. does not mix with water c. is composed of a phosphate group linked to an alcohol or amino acid d. is soluble in water e. more than one answer is correct
Which group of organisms is bilateral, has a pseudocoelom and a cuticle?
a. Platyhelminthes b. Nematoda c. Porifera d. Annelids e. Planarians