Which of the following appeared last in the course of animal evolution? nerve net coelom notochord 4 chambered heart amniotic egg 2. Antibodies against polioviruses can prevent the disease because 1. the antibodies bind to the viral particles and prevent the viral particles to attach to the receptors on host cells 2. the antibodies can bind to host cells and protect the host cells from the virus 3. the antibodies kill all host cells that are infected by the virus 4. the antibodies directly break down the viral particles Which of the following is true about bacterial endospores? 1. Endospores are very resistant to heat. 2. Endospores can be easily inactivated by disinfectants. 3. One bacterial cell can produce many endospores. 4. Endospores can germinate and grow in environment without water and nutrients..

1. Which of the following appeared last in the course of animal evolution?
nerve net
coelom
notochord
4 chambered heart
amniotic egg
2. Antibodies against polioviruses can prevent the disease because
1. the antibodies bind to the viral particles and prevent the viral particles to attach to the
receptors on host cells
2. the antibodies can bind to host cells and protect the host cells from the virus
3. the antibodies kill all host cells that are infected by the virus
4. the antibodies directly break down the viral particles
Which of the following is true about bacterial endospores?
1. Endospores are very resistant to heat.
2. Endospores can be easily inactivated by disinfectants.
3. One bacterial cell can produce many endospores.
4. Endospores can germinate and grow in environment without water and nutrients.