Plastids originated from which of the following groups of bacteria?
A. Cyanobacteria
B. Spirochaetes
C. Proteobacteria
D. Staphlococcus
E. Actinobacteria
A. Cyanobacteria
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Which of the following is true of DNA?
A. The nucleotides in one strand are connected by hydrogen bonds. B. A phosphate group in a nucleotide is attached to the 3 carbon in ribose. C. A purine always forms a complementary base pair with a pyrimidine. D. The percentage of the purine A always equals the percentage of the purine G. E. It is used by ribosomes for translation.
Ras is to Raf, as MEK is to
A) Ras. B) tyrosine. C) MAPK. D) Cdc. E) cell growth.
CRISPR was discovered
A. accidentally, by scientists working with bacteria in the food industry. They were looking for ways to make cheese and yogurt production more effective. B. by a dedicated team of researchers studying sickle-cell disease. It had long been hypothesized that this approach would be effective in editing genes and researchers worked for several years searching for ways to make it possible. C. by a worldwide group of researchers that collaborate and share ideas on the treatment of cancer. This approach was originally developed in order to edit the genes that lead to breast cancer and has since been adopted for other therapeutic uses as well. D. accidentally by a graduate student working in a Harvard laboratory. The student was trying to find a way to genetically modify yeast efficiently.
Which type of organelle is primarily involved in the synthesis of oils, phospholipids, and steroids?
a. ribosome b. lysosome c. smooth endoplasmic reticulum d. mitochondrion e. contractile vacuole