The activation of helper T cells is likely _____
A) when an antigen is displayed by a dendritic cell
B) when a cytotoxic T cell releases cytokines
C) when natural killer cells come in contact with a tumor cell
D) in the bone marrow during the self-tolerance test
E) when B cells respond to T-independent antigens
Answer: A
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For an individual Drosophila melanogaster fly the time from when it is laid as an egg to when it is an
adult capable of breeding is about ____.
a. 3 months b. 2 days c. 6 weeks d. 10 days e. 1 month
In 1959, doctors began using the powerful antibiotic methicillin to treat infections of
A. Staphylococcus aureus, but within two years, methicillin-resistant strains of S. aureus (MRSA) appeared. How did the resistant strains of S. aureus emerge? Staphylococcus aureus bacteria that were able to synthesize cell walls using a protein that was not affected by methicillin survived the methicillin treatments and reproduced at higher rates than did other individuals. Over time, these resistant individuals became increasingly common. B. In response to treatment of Staphylococcus aureus infections with methicillin, some bacteria began to synthesize cell walls using a protein that was not affected by methicillin. These bacteria survived the methicillin treatments and reproduced at higher rates than did other individuals. Over time, these resistant individuals became increasingly common. C. In response to treatment of Staphylococcus aureus infections with methicillin, bacterial populations gradually began to synthesize cell walls using a protein that was not affected by methicillin.
What does the chloroplast produce during the light independent reactions of photosynthesis?
What will be an ideal response?
If a home uses a large supply of solar panels to generate electricity, but has no battery system, surplus electricity that is produced is usually ______
A- released harmlessly into the ground B- used to power chemical reactions that generate water for the home C- released into the power grid for others to use, generating a credit to the homeowner D- used to pump water high up into a tank to store the energy