Answer the following statements true (T) or false (F)
1. Sexual selection is a type of natural selection resulting from variation in the ability to find mates.
2. Today, 40% of hospital Staphylococcus infections are resistant to all antibiotics except one.
3. Evolution does answer the question as to how life originally began.
4. Artificial selection is responsible for many breeds of dogs and cats.
5. Darwin believed that because of "differential reproductive success" a population would change over time
1.TRUE
2.TRUE
3.FALSE
4.TRUE
5.TRUE
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Imagine that a section of heart muscle no longer has gap junctions. What do you think would be the result?
A. The effects would be minimal from this change. B. The ability of the heart muscle cells to contract would be severely compromised. C. The ability of the heart muscle cells to reproduce would be severely compromised. D. The ability of the heart muscle cells to coordinate their contractions would be severely compromised.
Vascular tissue cells that join end to end in tubelike columns are known as ____
a. sclerenchyma b. tracheids c. collenchyma d. parenchyma
e. vessel elementsThis microscope achieves the highest magnification and greatest resolution.
A) Compound light microscope B) Phase-contrast microscope C) Darkfield microscope D) Fluorescence microscope E) Electron microscope
When individuals are first infected with HIV, early symptoms are flu-like, but when the immune system responds, people recover from these flu-like symptoms and then can become asymptomatic for as long as 10 years
However, HIV eventually wins its battle with the immune system, and individuals will eventually show symptoms of AIDS. Why does HIV eventually win its battle with the immune system? A) HIV is a latent virus and only actively reproduces when conditions are perfect. B) HIV is constantly reproducing but doesn't produce the vital toxins necessary to kill T4 cells until a certain period of time has passed. C) During the asymptomatic period, new variants of HIV arise, and antibodies produced against earlier variants don't recognize the new variants. D) The population of HIV doesn't change during the asymptomatic period, and therefore, antibodies that were produced originally against it are destroyed by the spleen.