A hypothesis is a(n) ________

A) tentative answer to a question
B) guess
C) observation
D) theory


A

Biology & Microbiology

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Normal fruit flies have red eyes. Flies with mutations that block the function of the X-linked white gene have white eyes. The wild-type allele is completely dominant to mutant alleles. A cross between a white-eyed female fruit fly and a red-eyed male would generate which of the following types of progeny?

A) red-eyed females and white-eyed males B) white-eyed females and red-eyed males C) all red-eyed females and a 50:50 mixture of white-eyed and red-eyed males D) all red-eyed males and a 50:50 mixture of white-eyed and red-eyed females E) The result cannot be predicted because it depends on whether the female is homozygous or heterozygous.

Biology & Microbiology

What do the DNA sequences found at the origins of replication signify?

What will be an ideal response?

Biology & Microbiology

The neuron requires a certain level of depolarization of its membrane in order to generate an action potential. This level of depolarization is known as the ________

Fill in the blank(s) with correct word

Biology & Microbiology

The two-signal activation process for T cells includes

A) interaction of the T-cell receptor with the MHC-antigen complex on the APC AND binding between co-stimulatory proteins on the T cell and APC surfaces. B) the presence of a superantigen and the presence of appropriate antibodies. C) interaction of the T-cell receptor with the MHC-antigen complex on the APC AND the presence of a superantigen. D) the presence of antibodies AND binding between co-stimulatory proteins on the T cell and APC surfaces. E) the presence of a superantigen AND binding between co-stimulatory proteins on the T cell and APC surfaces.

Biology & Microbiology