In living organisms, most chemical reactions are facilitated by enzymes. The relationship between temperature and reaction rate of enzymatically catalyzed reactions is typically "hump-shaped", with a slower uprising slope, and typically a very steep descending slope above a certain temperature, often just above 40°C (~105°F).Explain in 1-3 sentences what causes the shape of this curve below and above the temperature optimum of an enzyme?

Generally th rate of reaction of most enzymes will double by a rise in 10 degrees Celsius, but when temperature is more than optimum temperature heat denatures the enzyme which cause the steep descending slope.

Explanation:

The velocity of enzyme reaction increases when temperature of the medium is increased reaches a maximum and then falls (Bell shaped curve). The temperature at which the maximum amount of substrate is converted to the product per unit time is called optimum temperature. As temperature increases more molecules get activation energy.

Generally, the rate of reaction of most enzymes will double by a rise in 10 degrees celsius. But when the temperature is more than 50 degrees celsius, heat denaturation and consequent loss of tertiary structure of protein occurs. So activity of the enzyme is decreased which cause the steep descending slope.

the correct answer is: b. pantala flavescens, because these organisms would have a high level of genetic variation due to sexual reproduction.  

because involves two organisms (parents) whose genetic material combines, sexual reproduction leads to genetic variation in new generations of offspring. the offspring is an unique organism, with new genome, more protected with the higher ability to adapted. this process is fundamental to evolution.

multiple allele inheritance is traits controlled by more than 2 alleles (ex: pigeons having 3 alleles of one gene govern their feather color).   so the answer is a.