Why does transcription occur in the nucleus and not in the cytoplasm in eukaryotes?
A) RNA cannot exist in the cytoplasm.
B) DNA cannot leave the nucleus.
C) Ribosomes cannot leave the nucleus.
D) Codons are only found in the nucleus.
B
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One important difference between amniocentesis and chorionic villus sampling is that ____
a. chorionic villus sampling is more routine b. amniocentesis can diagnose chromosome disorders, while chorionic villus sampling cannot c. chorionic villus sampling can be done earlier in the pregnancy than amniocentesis d. maternal risks are higher with chorionic villus sampling e. the risk of miscarriage is higher with amniocentesis than with chorionic villus sampling
Bcl-2 acts as a(n) ________ by promoting ___________
a) oncogene, cell division b) haplogene, cell division c) cancer gene, survival of potential cancer cells that would otherwise die by apoptosis d) oncogene, survival of potential cancer cells that would otherwise die by apoptosis e) haplogene, survival of potential cancer cells that would otherwise die by apoptosis
To limit water loss, land plants developed
A) stomata. B) a cuticle. C) flowers. D) vascular tissue. E) lignin.
The destruction of the ________ layer increases the amount of damaging UV light that reaches Earth's surface
Fill in the blank(s) with correct word