What feature distinguishes all hormones from neurotransmitters?
A. Hormones travel via the blood to a target tissue, while neurotransmitters cross the synaptic cleft to a postsynaptic cell.
B. Hormones require large concentrations to have an effect, while neurotransmitters require only low concentrations.
C. Hormones are steroids, while neurotransmitters are amino acids.
D. A hormone affects reproductive functions, while neurotransmitters control all other processes.
Answer: A
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Laboratory simulations provide indirect evidence that organic compounds such as __________ and
__________ self-assemble spontaneously under conditions like those thought to have prevailed on the early Earth. Fill in the blank(s) with the appropriate word(s).
Mendel's principle of segregation states that:a
alleles from one parent mask the expression of alleles from the other parent. b. alleles separate from each other before forming gametes. c. hybrids will express a phenotype intermediate between the two parental phenotypes. d. true-breeding parents produce offspring of the same phenotype. e. dominant and recessive alleles segregate during meiosis.
Which of the following provides taxonomic information that includes the information obtained in the others listed?
A) nucleic acid hybridization B) nucleic acid-base composition C) amino acid sequencing D) biochemical tests E) cladogram
Hepatitis B virus releases a large amount of viral antigen, which benefits the patient by
A. producing a stronger cellular immune response. B. activating antibody mediated immunity. C. making it easier to develop a vaccine. D. allowing for better treatment. E. ensuring plentiful substrate for binding with labeled antibodies in diagnostic tests.