By definition, prokaryotic cells do not possess __________
(a) a nucleus.
(b) replication machinery.
(c) ribosomes.
(d) membrane bilayers.
(a)
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Both low birth and death rates characterize the demographic transition. Which factors will lower birth and death rates for twenty-first century Homo sapiens?
What will be an ideal response?
The inner mitochondrial membrane contains numerous inward folds called cristae, which greatly increase the surface area of this membrane. Because ATP is produced on the inner mitochondrial membrane, cristae enhance the ability of the mitochondria to generate ATP. What structure can be thought of as similar to these cristae?
A. Cartilage B. Bronchiole C. Finger-like projections of a human's small intestine D. Spiracle
Which of the following correctly describes papilloma virus (HPV) effects on cell growth?
A. Viral E7 degrades cellular p53 B. Causes insertional inactivation of critical genes C. Viral E6 perturbs the normal function of cellular Rb D. Viral E6 stimulates degradation of cellular p53
Each TNFR1 receptor subunit has a cytoplasmic domain with a segment of about 70 amino acids that mediates protein-protein interactions. This domain of the receptor is referred to as the ______ domain.
a) central b) death c) morte d) terminal e) cytoplasmic