Biology, 11.01.2020 03:31 jawontestephens
The restriction enzymes of bacteria protect the bacteria from successful attack by bacteriophages, whose genomes can be degraded by the restriction enzymes. the bacterial genomes are not vulnerable to these restriction enzymes because bacterial dna is methylated. this situation selects for bacteriophages whose genomes are also methylated. as new strains of resistant bacteriophages become more prevalent, this in turn selects for bacteria whose genomes are not methylated and whose restriction enzymes instead degrade methylated dna. the outcome of the conflict between bacteria and bacteriophage at any point in time results from
select one:
a. frequency-dependent selection
b. evolutionary imbalance
c. heterozygote advantage
d. neutral variation
e. hardy-weinberg equilibrium
Answers: 1
Biology, 21.06.2019 15:00, paolaz80045
Which class of molecules contains the amino group, nh2 (a) sugars (b) water (c) proteins (d) hydrocarbons
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Use this dichotomous key for insect identification to identify the insect shown. 1. a. insect has one pair of wings. order diptera b. insect has two pairs of wings. go to #2 2. a. front wings thicker in texture than hind wings go to #3. b. front and hind wings are same texture throughout. go to #4 3. a. front wings are short order dermaptera b. front wings cover entire abdomen order coleoptera 4. a. wings with scale on all parts of their area. order lepidoptera b. wings without scales go to #5. 5. a. hind wings smaller than front wings. order ephemeroptera b. front and hind wings nearly equal in size. order odonata the insect pictured is in the order diptera. ephemeroptera. coleoptera. odonata.
Answers: 3
The restriction enzymes of bacteria protect the bacteria from successful attack by bacteriophages, w...
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