What is true of normal human urine production?I-Blood pressure is used to push nitrogenous waste, water, and small molecules through a filter, forming the filtrate, while cells and most proteins are retained in the blood.II-Most water is reabsorbed as the filtrate is passing through a long tube.III-Ammonia is produced as the metabolic breakdown is excreted.
A. just I
B. II and III
C. I, II, and III
D. just II
E. I and II
Answer: E
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In a population of 400 salamanders, some individuals have long toes and others have short toes. This phenotypic difference is due to a single gene with dominant and recessive alleles, T and t, where T confers long toes. If the toe length gene is in Hardy Weinberg equilibrium, and 256 individuals have short toes, how many individuals are heterozygous at the toe length locus?
A) More information is needed to determine the answer. B) 32 C) 128 D) 144
Polar bears are top predators, and tests on their tissues have shown a surprising ____
a. resistance to warming b. amount of protein c. resistance to disease d. amount of mercury and organic pesticides e. amount of nutrients
Select all structures that are part of the peripheral nervous system.
A. spinal nerves B. cranial nerves C. spinal cord D. brain
Genetic imprinting is caused by ____
a. insertion of a nucleotide into an exon b. deletion of an amino acid from the mRNA strand c. a frameshift mutation d. epigenetic changes to DNA e. a change in a termination codon