Many species of insects undergo a state of arrested development in their life cycle to avoid desiccation or cold, referred to as
A) torpor.
B) hibernation.
C) diapause.
D) metamorphosis.
C
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Analysis of the genome of Mycobacterium tuberculosis has revealed all the following EXCEPT
A. it has 99.5% homology with the genome of M. bovis. B. it is significantly larger than the genome of M. leprae. C. it is more closely related to M. leprae than to M. bovis.
The membranes inside the chloroplast are called the
1.cristae. 2.stroma. 3.thylakoid membrane. 4.golgi. 5.endoplasmic reticulum.
X-ray diffraction studies are used to determine the:a
sequence of amino acids in protein molecules. b. sequence of nucleotides in nucleic acid molecules. c. distances between atoms of molecules. d. identity of an unknown chemical. e. wavelength of X-rays.
Some friends are trying to make wine in their basement. They've added yeast to a sweet grape juice mixture and have allowed the yeast to grow. After several days they find that sugar levels in the grape juice have dropped, but there's no alcohol in the
mixture. The most likely explanation is that the A) mixture needs more sugar because yeasts need a lot of energy before they can begin to produce alcohol. B) mixture needs less oxygen because yeasts only produce alcohol in the absence of oxygen. C) mixture needs more oxygen because yeasts need oxygen to break down sugar and get enough energy to produce alcohol. D) yeast used the alcohol as a carbon source.