Biologists suspect that endosymbiosis gave rise to mitochondria before plastids partly because
a. the products of photosynthesis could not be metabolized without mitochondrial enzymes.
b. almost all eukaryotes have mitochondria, whereas only autotrophic eukaryotes generally have plastids.
c. mitochondrial DNA is less similar to prokaryotic DNA than is plastid DNA.
d. without mitochondrial CO2 production, photosynthesis could not occur.
e. mitochondrial proteins are synthesized on cytosolic ribosomes, whereas plastids utilize their own ribosomes.
Ans: b. almost all eukaryotes have mitochondria, whereas only autotrophic eukaryotes generally have plastids.
You might also like to view...
Biological evolution occurs in ____ when specific processes cause genomes of organisms to differ
from their ancestors
a. individuals b. populations c. communities d. phenotypes e. sub-species
Chytridiomycetes produce enzymes that digest cellulose, chitin, and similar molecules. Because of this, they are found in the digestive tract of
A. lichens. B. ruminants. C. plants. D. frogs. E. people.
What is the interpretation of the following patient results? (normal values) WBC = 90.0 th/uL (5.0-10.0 th/uL,), with 89% lymphs (20-40%); CD3 = 90% (60-80%); CD5 = 87% (60-80%); CD10 = 0% (< 1%); CD4 = 88% (30-65%); CD20 = 12% (5-20%); CD34 = 0% (< 1%); CD8 = 3% (10-40%); kappa = 10% (3-15%); lambda = 5% (2-10%); CD19 = 15% (5-20%).
A) normal B) B-cell acute leukemia C) T-cell acute leukemia D) B-cell chronic leukemia E) T-cell chronic leukemia
What structures are found along lymphatic vessels and are heavily clustered in the armpit, groin, and neck?
A. Lymph nodes B. Thymus C. Spleen D. GALT E. Tonsils