The function of cell walls in plants is for____ and ___.
Fill in the blank(s) with the appropriate word(s).
Ans: protection and structure
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The primary structure in a protein
A. refers to the helical folding of a protein. B. refers to two or more polypeptides linked to one another. C. refers to the sequence of amino acids. D. refers to the initial folding of a protein.
The CRISPR-Cas system is exploited experimentally for ____
a. programmable RNA-guided genome editing b. programmable DNA-guided genome editing c. cutting DNA at specific sites so it can be inserted into a cloning vector d. increasing transcription of a gene of interest e. enhancing DNA polymerase activity in PCR reactions
Some bacteria in the deep oceans use iron as an
energy source to make carbohydrates from carbon dioxide. These bacteria would be classified as
a. chemoautotrophs. b. chemoheterotrophs. c. photoautotrophs. d. photoheterotrophs. e. decomposers
The greenhouse effect, which has become a major ecological concern, is caused by
A) the destruction of ozone in the upper atmosphere. B) the increase in atmospheric concentrations of greenhouse gases (CO2,CH4, and N2O). C) overuse of fertilizers in farming. D) global warming. E) the release of heat energy from burning fossil fuels.