during a life cycle of adult lancet fluke live in cows. They spread their eggs in cow manure, snails eat the eggs and the immature parasites hatch and infect their intestine. The snail coughs up these offspring in balls of slime and ants eat these slime balls loaded with flukes. The flukes migrate to the ant’s head and make them climb to the tops of grass blades where they are eaten by cows and the cycle starts over again

a. Only ant act as inntermediate host 

b. both snail and Ant act as intermediate host

c. cow act as definitive host due to sexual reproduction

d. only snail act as intermediate host due to asexual reproduction

#Question id: 393

#Unit 1. Molecules and their Interaction Relevant to Biology

Carbon dioxide (CO2) is readily soluble in water, according to the equation CO2 + H2O ↔ H2CO3. Carbonic acid (H2CO3) is a weak acid. If CO2 is bubbled into a beaker containing pure, freshly distilled water, which of the following graphs correctly describes the results?

#Question id: 394

#Unit 1. Molecules and their Interaction Relevant to Biology

What will be the H+ ion concentration in a solution prepared by mixing 50.0 mL of 0.20 M NaCl, 25 mL of 0.10M NaOH and 25.0 mL of 0.30M HCl?

#Question id: 395

#Unit 1. Molecules and their Interaction Relevant to Biology

How would acidification of seawater affect marine organisms? Acidification of seawater would ________.

#Question id: 396

#Unit 1. Molecules and their Interaction Relevant to Biology

Identical heat lamps are arranged to shine on two identical containers, one containing water and one methanol (wood alcohol), so that each liquid absorbs the same amount of energy minute by minute. The covalent bonds of methanol molecules are nonpolar, so there are no hydrogen bonds among methanol molecules. Which of the following graphs correctly describes what will happen to the temperature of the water and the methanol?

#Question id: 397

#Unit 1. Molecules and their Interaction Relevant to Biology

The loss of water from a plant by transpiration cools the leaf. Movement of water in transpiration requires both adhesion to the conducting walls and wood fibers of the plant and cohesion of the molecules to each other. A scientist wanted to increase the rate of transpiration of a crop species to extend its range into warmer climates. The scientist substituted a nonpolar solution with an atomic mass similar to that of water for hydrating the plants. What do you expect the scientist's data will indicate from this experiment?

#Question id: 398

#Unit 1. Molecules and their Interaction Relevant to Biology

One of the buffers that contribute to pH stability in human blood is carbonic acid (H2CO3). Carbonic acid is a weak acid that, when placed in an aqueous solution, dissociates into a bicarbonate ion (HCO3-) and a hydrogen ion (H+). (See figure.)

If the pH of blood drops, one would expect ________.