A stratified water column consists of ________ called the epilimnion and ________ called the hypolimnion
a. warmer, denser water / colder, less dense water
b. colder, less dense water / warmer, denser water
c. warmer, less dense water / colder, denser water
d. colder, denser water / warmer, less dense water
Answer: C
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Which of the following are environmental stimuli that influence plant responses?
A. rocks, light, touch, music B. water, gravity, temperature, soil minerals, microorganisms C. wind, temperature, fungi D. CO2, light, water vapor, gravity E. touch gravity, herbivores, pathogens
Answer the following statements true (T) or false (F)
1. The movement of DNA polymerase continues unimpeded if a thymine dimer is present in the DNA double helix. 2. Cells are normally limited to one DNA repair system that corrects DNA mistakes. 3. Patients who suffer from xeroderma pigmentosum (XP) have a defective mismatch repair system. 4. Cancers originate from a single cell.
In primary mutant screens,
A) mutant flies are identified by morphology and then the mutant genes are isolated and studied. B) mutant flies are created by RNAi using random RNA sequences and then the genes affected identified. C) mutant flies are created by gain-of-function expression of random genes. D) two mutant flies are mated to determine if there is an effect on morphology.
Which type of macromolecule is an informational molecule?
A) protein B) DNA C) ATP D) monosaccharide E) fatty acid