The bacteriophages used in Alfred Hershey's and Martha Chase's experiments showed that:a
DNA was injected into bacteria.
b. DNA and protein were injected into bacteria.
c. DNA remained on the outer coat of bacteria.
d. proteins were injected into bacteria.
e. proteins were responsible for the production of new viruses within the bacteria.
a
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Which type of signal receptor does NOT generally involve transduction of a signal with the transfer of a phosphate group? (Select all correct choices.)
A. G protein-coupled receptor B. receptor kinase C. ligand-gated ion channel D. nuclear receptor
Cordgrass (Spartina alterniflora) can be found in different forms, such as tall in the low marsh environment and short in the high marsh environment. This response to environmental conditions is an example of genotypic plasticity
Indicate whether the statement is true or false
Human cells have
A. 23 pairs of chromosomes. B. 23 chromosomes. C. 46 pairs of chromosomes. D. 2 pairs of sex chromosomes. E. one pair of autosomes.
Which is incorrect about parvoviruses?
A. They cannot be transmissible to the fetus. B. Parvovirus B19 causes erythema infectiosum C. They are single-stranded DNA viruses. D. They cause several diseases in dogs, cats, and other mammals. E. They cause a disease known as fifth disease.