Axis development is determined by a MATERNAL EFFECT gene in Drosophila. A dominant Bicoid allele is required to set up the correct axis development in flies. bb (two loss of function alleles) is LETHAL in this MATERNAL EFFECT gene
A female Drosophila named Eustacia had all dead offspring. What is Eustacia's GENOTYPE?
A) Bb or bb B) Bb C) bb D) BB or Bb E) BB
Answer: C
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Receptors for neurotransmitters are of primary functional importance in assuring one-way synaptic transmission because they are mostly found on the _____
A) axonal membrane B) axon hillock C) postsynaptic membrane D) mitochondrial membrane E) presynaptic membrane
Root structures that grow around and encapsulate mutualistic nitrogen-fixing bacteria are called ____
a. hyphae b. mycorrhizae c. Casparian strip d. root hairs e. root nodules
Human cells require ____ vitamins at a
minimum. a. 5 b. 8 c. 10 d. 13 e. 20
Two proteins associated with a rare neurodegenerative disorder have been sequenced. Protein A contains many polar amino acids with small regions containing nonpolar, hydrophobic amino acids
Protein B is rich in nonpolar, hydrophobic amino acids with only two small regions containing polar amino acids. What might this suggest about the two proteins? A) The two proteins may have different secondary structures. B) Protein A is fibrous and Protein B is globular. C) Protein A may be a cytoplasmic protein and Protein B may be a membrane associate protein. D) Protein A and Protein B are complementary parts of a supramolecular structure. E) Protein A is most likely and enzyme and Protein B is most likely a storage protein.