1) true; 2) false; 3) true
Answer:
A. insects fly around a bright lamp at night
Explanation:
insects are naturally attracted to light due to presence of positive phototaxis. Insects revolve around the light in the same way as electrons do around the nucleus.
Answer:
A. Lipid A
Explanation:
The outer membrane of Gram-negative bacteria is present outside to the thin peptidoglycan layer. The outer membrane consists of lipopolysaccharide (LPS) which is the molecule having both carbohydrates and lipids.
The lipopolysaccharide has three parts out of which lipid A is the toxin one. Lipid A is embedded in the outer membrane through its fatty acids. When lipid A enters the blood stream of the host cell, it leads to septic shock. Lipid A is heat stable and highly toxic.
If a unicellular organism was exposed to a hypotonic solution for an extended period of time, it would gradually swell and burst. In a hypotonic solution, the amount of solutes are lesser outside the cell compared to inside of it. Water will move into the cell making the it bigger and eventually will result to its eruption.
<span>The pressure generated during contraction of the atria is less than that generated during contraction of the ventricles.The reason is the different distance from the artria to ventricles and the distance from ventricles to circulatory system.
</span>The distance from atria<span> to </span>ventricles<span> is </span>less than<span> that from </span>ventricles<span> to circulatory system.</span>
