Membranous system of tubules, vesicles, and sacs in eukaryotic cells; site of lipid synthesis; lacks attached ribosomes.
What will be an ideal response?
Smooth endoplasmic reticulum (SER)
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The color of a daisy's petals is a(n) ________, the instructions for which are found in a gene controlling petal color. There may be many alternate versions of this gene, which are called __________.
A) trait; chromosomes B) trait; alleles C) base pair; alleles D) base pair; traits E) allele; traits
Fossils include
a. skeletons. b. shells. c. seeds. d. tracks. e. all of these.
In the Hershey-Chase experiment, bacterial viruses, called phage, were used to demonstrate that DNA is the genetic material. The phage that were used for this experiment consisted of DNA surrounded by a protein coat. Phage will attach to specific types of bacteria and inject their DNA into the bacterial cell. To scientifically determine whether DNA is the genetic material, Hershey and Chase made
phage in a medium containing radioactive sulfur-35 (S35). Why was S35 used in this experiment? A. Only amino acids contain sulfur. B. Only nucleic acids contain sulfur. C. Both nucleic acids and amino acids contain sulfur. D. The radioactive sulfur labels peptide bonds.
How do corals react when water temperatures are too high?
A. They migrate to areas with lower water temperatures. B. They slow down their shell-building processes. C. They expel their symbiotic algae. D. They reproduce in large numbers. E. They produce more pigment.