Answer the following statements true (T) or false (F)
1. A reason that some antibiotics harm bacteria but not humans is because these antibiotics inhibit enzymes only found in bacteria.
2.. Phagocytosis is a process that cells use to move large particles in through the cell membrane.
3. Receptor-mediated endocytosis is a specialized, more selective method of cell membrane transport than pinocytosis.
4. In addition to providing energy to the organism conducting photosynthesis, photosynthesis also provides raw materials and energy for heterotrophic organisms.
5. As this graph shows, photosynthesizing eukaryotes have several pigments and accessory pigments that selectively capture the green wavelengths of photons for photosynthesis.
1. TRUE
The molecular differences between bacteria and humans means they may not have the same enzymes to inhibit with medicine.
2.TRUE
This form of endocytosis also helps cells protect others from infection.
3.TRUE
This transport only happens when specific molecules are present.
4.TRUE
While light is the primary energy source, there are organisms that transfer energy from complex molecules without sunlight.
5.FALSE
Higher values of absorption indicate wavelengths used for photosynthesis.
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True or False: A researcher hopes to estimate the size of an E. coli population in a liter of seawater. To do this, he can count the number of E. coli bacteria in a milliliter of seawater and multiply this number by 1000
A. true B. false
Which would be more likely to cause illness-a water sample that tested positive for coliforms or one that tested positive for E. coli O157:H7?
A. Both would be equally capable of causing illness-all coliforms cause illness. B. The coliform positive sample would be more likely to cause illness. Coliforms are inherently more pathogenic than the weak O157:H7 lab strain of E. coli. C. The E. coli O157:H7 sample would be more likely to cause illness. This strain of bacterium is highly pathogenic and capable of causing kidney damage. D. Neither-there is usually a small amount of coliforms (including E. coli O157:H7) in all water.
In mismatch repair on newly replicated DNA, enzymes distinguish between old and newly replicated DNA strands based on the fact that newly replicated DNA strands are ________-methylated relative to older DNA.
Fill in the blank(s) with the appropriate word(s).
Which of the following is essential in PCR?
A) DNA polymerase B) antisense RNAs C) reverse transcriptase D) DNA primers E) both DNA primers and DNA polymerase