Answer the following questions true (T) or false (F)
1. Interferons alpha and beta are effective against viruses.
2. The resident microbiota have no role in defense against pathogen invasion.
3. Sweat can cause damage to bacteria because it contains salt and lysozyme.
1. TRUE
2. FALSE
3. TRUE
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Which photoreceptor cell type is present at high concentration in the fovea?
A. amacrine cells B. cone cells C. bipolar cells D. rod cells
What will happen to a long-day plant, such as spinach, if the light-dark pattern is interrupted by a flash of light for several days in a row during the spring?
A) The plants won't flower that season. B) The plants are tricked into flowering earlier than usual. C) Nothing will happen; growth and development will continue as normal. D) The plants will be delayed in flowering.
The cytoskeleton is composed of:
A) microfilaments, mitochondria, and intermediate filaments. B) microfilaments, cilia, and intermediate filaments. C) microfilaments, intermediate filaments, and microtubules. D) microfilaments, microtubules, and lysosomes. E) microtubules, intermediate filaments, and cilia.
Founder effects and bottlenecks are ___________.
a. expected only in large populations b. mechanisms that increase genetic variation in a population c. two different modes of natural selection d. forms of genetic drift