In modern terminology, Mendel's heredity "factors" are called
A. DNA.
B. chromosomes.
C. genes.
D. RNA.
C. genes.
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In your textbook, there is a discussion of the experiment by Wigglesworth that demonstrated that PTTH (prothoracicotropic hormone) triggers molting and the release of ecdysone
In 1984, Nagasawa et al. published a paper entitled: "Amino-terminal amino acid sequence of silkworm prothoracicotropic hormone: homology with insulin." The similar amino acid sequence between PTTH and insulin suggests that: A. a common ancestral peptide evolved into peptides with different functions in insects and invertebrates. B. if PTTH were given to vertebrates it would likely trigger glucose uptake by cells. C. insulin causes molting in vertebrates.
Freshwater flatworms have a _______ system that is primarily important in osmoregulation, so you would expect the urine in these tubules to have an osmolarity ____ the osmolarity of the body fluids.
A. protonephridial, lower than B. protonephridial, higher than C. metanephridial, lower than D. metanephridial, higher than E. protonephridial, similar to
A hypothesis
1.is a tentative explanation for an observation that can be tested by further investigation. 2.is never tested by an experiment. 3.is never used by field biologists. 4.is the same as a theory.
In what way are a human and a crab similar?
A. Both have muscles that pull against rigid skeletons. B. Vertebrates and arthropods are deuterostomes. C. Both have closed circulatory systems. D. Both have a continuous growth pattern.