The graph below illustrates a single species of bacteria grown at various pH levels. The most likely reason there are no
colonies in cultures of this species at pH 4 and at pH 10 is
that
Number of Colonies of Bacteria
Present at various pH Levels
70
60
50
40
Number of Colonies of

Bacteria Present in Culture
30
20
10
0
4
5
6
7
8
9
10
pH
O these bacteria could successfully compete with other species of
bacteria at these pH values
there are more predators feeding on these bacteria at pH 4 and
pH 10 than at other pH levels
O at pH 4 and pH 10 the environment is too acidic or too basic for
the bacteria to grow
fertilization cannot occur in these bacteria at pH 4 or pH 10

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Which of the following represents a negatively charged ion? of t 7

This is due ! matching pairs of chromosomes from parents are called a. homologous chromosomes b. heterozygous chromosomes c. herterogenes d. homologous bands

Awoman whose sister tested positive for a specific mutation in the brca1 gene, which increases the risk for breast and ovarian cancer, is found not to have that mutation but does have a mutation of unknown significance near the known mutation site. how should this woman be counseled? select one: a. she should be informed that her risk for breast cancer is greater than the general population but not as great as her sister’s risk. b. she should be informed that because she does not have the mutation, her risk for breast cancer is not greater than that of the general population. c. she should be informed of her gene mutation status and be presented with all the available prophylaxis options and reconstruction options. d. she should be informed that she does not have the specific mutation but that because another mutation is present she should be vigilant about screening