Should government fund companies for the costs of research on rare diseases?
1.Yes, otherwise such diseases might not receive the attention they deserve.
2.No, because so few individuals suffer from such diseases.
2
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Which of the following are characteristics of Archaeopteryx lithographica? Check all that apply.
_____ a beak with teeth _____ a small, reptilian breastbone _____ claws _____ feathers on its wings _____ a tail with few vertebrae
Baby frog #1 is homozygous for a mutant allele of gene B (allele b1). Compare the DNA sequence from baby frog #1 with the wild-type sequence to determine how allele b1 is different from the wild-type. What effect does the mutation in allele b1 have on the protein?
A) Allele b1 has a frameshift mutation—a deletion of one nucleotide resulting in a frameshift that changes all amino acids from that point on.
B) Allele b1 has a deletion of one nucleotide outside of the coding region and there is not effect on the protein.
C) Allele b1 has a missense mutation—a nucleotide substitution that changes one amino acid to another.
D) Allele b1 has a nonsense mutation—a nucleotide substitution that forms a stop codon.
E) Allele b1 has a nucleotide substitution that does not change the protein.
What is the correct order of the passage of sperm, starting at the site of development and exiting the body?
A. Initial production occurs in the seminiferous tubules, sperm mature in the uterus, they then enter the vas deferens, they then pass through the ejaculatory duct and exit the body through the urethra. B. Initial production occurs in the seminiferous tubules, sperm mature in the epididymis, they then enter the vas deferens, they then pass through the ejaculatory duct and exit the body through the ureters. C. Initial production occurs in the seminiferous tubules, sperm mature in the epididymis, they then enter the fallopian tubes, they then pass through the ejaculatory duct and exit the body through the urethra. D. Initial production occurs in the epididymis, sperm mature in the seminiferous tubules, they then enter the vas deferens, they then pass through the ejaculatory duct and exit the body through the urethra. E. Initial production occurs in the seminiferous tubules, sperm mature in the epididymis, they then enter the vas deferens, they then pass through the ejaculatory duct and exit the body through the urethra.
Female fire beetles, Melanophilia sp., must seek out freshly-burned trees to lay their eggs in so the larvae can feed on the burned wood. What specialized neural structures might you expect these beetles to have to facilitate this behavior?
A. Special, enlarged synapses for rapid synaptic transmission B. Giant brain structures for processing auditory information C. Extra large axons for rapid axonal transduction D. Special sensory structures that can detect signs of fire or burned wood