Which animal nurses its young, has forward facing eyes, nails on its fingers and toes, and a moist nose?
a. a lemur
b. a tarsier
c. a bird
d. a new world monkey
e. a human
Answer: a. A lemur
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How does RNA polymerase II bind to the DNA?
a. It binds directly to the eukaryotic promoter sequence. b. It binds directly to the TATA box. c. It binds to transcription factors in the nucleus, and the complex then binds to the promoter. d. Transcription factors first bind to the promoter, then recruit RNA polymerase II. e. Some transcription factors bind to the promoter while others bind to RNA polymerase II, then the two groups of proteins bind to each other.
Explain how antibiotics are used to treat bacterial infections. What are some of the problems concerning the use of these drugs?
What will be an ideal response?
In a multicellular organism, nerve cells are different from muscle cells because
a. each cell type has a unique set of transcription factors and repressors, so it expresses a specific set of genes b. each type of cell within a multicellular organism contains a different set of genes c. random events within each cell regulate the expression of genes and result in different genes being expressed in different cells d. cells gain and lose different genes during embryonic development, so each cell in an adult only has some genes from the original set
Which of these molluscs sometimes do not have an exterior shell?
A) gastropods only B) bivalves only C) cephalopods only D) gastropods and cephalopods