The significance of the Miller–Urey experiment is:
a. that conditions on Earth 4 billion years ago could produce RNA.
b. that it is possible to produce LUCA in the laboratory.
c. that conditions on Earth 4 billion years ago could produce amino acids.
d. that it is possible to produce DNA under the same conditions as on Earth 4 billion years ago.
C
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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.
Florists often create brightly colored flowers by immersing the stems in colored water. Which
cells are primarily responsible for this color change?
a. phloem b. xylem c. xylem and phloem d. neither xylem nor phloem
Which of the following explains why a saturated fat and an unsaturated fat are different?
a. A saturated fat contains double bonds, while an unsaturated fat does not. b. An unsaturated fat contains double bonds, while a saturated fat does not. c. A saturated fat is liquid at room temperature, while an unsaturated fat is not. d. A saturated fat can be called an oil, while an unsaturated fat cannot.
The process by which the presence and activity of neighboring cells determine an aspect of development is called ________
Fill in the blank(s) with correct word