Male deer have large antlers that are used to challenge each other in fights for territory and females. The females of this group actively choose the strongest males. Which type of sexual selection is occurring with the deer population?
A. Intersexual and intrasexual selection are both occurring.
B. Intrasexual selection.
C. Stabilizing selection.
D. Negative frequency-dependent selection.
E. Intersexual selection.
Answer: A
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A young woman decides to become a vegan and suddenly cuts out all animal products from her diet. She also makes the decision to no longer eat sugar. This will result in:
A. both more bacteroidetes and fewer firmicutes being present in her intestines. B. both more firmicutes and fewer bacteroidetes being present in her intestines. C. fewer bacteroidetes being present in her intestines. D. more firmicutes being present in her intestines. E. no change in the composition of her intestinal bacteria.
In a cell-mediated immune response, how does a helper T cell activate cytotoxic T cells?
a. antibodies b. cytokine signaling c. receptor signaling d. via cross-talk with macrophages e. neural signaling
Cultures of a bacterial strain were incubated in a refrigerator (5°C), on a lab bench (22°C), in a 37°C incubator, and in a 50°C incubator. After incubation, there was no growth at 37°C and 50°C, slight growth in the refrigerator, and abundant growth on the lab bench top. Which term best describes this organism?
A. Capnophile B. Mesophile C. Halophile D. Psychrotroph E. Anaerobe
The cell does not need ATP to survive.
a. true b. false