Which nucleotide bases are purines?

a. adenine & guanine

b. adenine & thymine

c. guanine & cytosine

d. cytosine& thymine

Which phrase describes a gene in its simplest form? a. a looped portion of RNA b. a part of a protein c. a molecule found in the endoplasmic reticulum d. a segment of DNA

Which species has the shortest incubation time? chicken duck turkey goose

If calcium levels within a man's blood drop too low it can result in twitching, depression, coma, or even death. Which characteristic of life is the man being affected by? Living things must maintain homeostasis. Living things are made of cells.

Which compound does most of the work to carry out cell processes?

Members of which phylum contain stinging capsules that poison the entangled prey

Individual iv-3 is born as a male affected with condition b but not condition a. his parents are bred again, and an ultrasound shows that the fetus is another male. the relevant portion of the pedigree is shown below.

If a diet does not provide adequate carbohydrate to meet immediate energy needs, the body compensates by altering its metabolism of other nutrients. insufficient dietary carbohydrate can lead to elevated levels of ketone bodies.

If an enzyme-mediated reaction were carried out at a temperature that was higher or lower than optimal, the vmax for the reaction would probably be

Which of the following is not a mechanism of microevolution? Group of answer choices migration (gene flow) natural selection speciation genetic drift

What weather factor is also a measurement of energy held within the air? Humidity Pressure Temperature Wind